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        <TitleTxt>Trustee</TitleTxt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Henry B Pearsall</PersonNm>
        <TitleTxt>Trustee</TitleTxt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Robert J Schillerstrom</PersonNm>
        <TitleTxt>Trustee</TitleTxt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Donald C Sharp</PersonNm>
        <TitleTxt>Trustee</TitleTxt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Joseph L Weidenbach</PersonNm>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Gerard T Donnelly PhD</PersonNm>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Timothy E WolkoberCPA</PersonNm>
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        <PersonNm>Jill Koski</PersonNm>
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        <PersonNm>Susan Wagner</PersonNm>
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        <PersonNm>Kris Bachtell</PersonNm>
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        <PersonNm>Jennifer Goodsmith</PersonNm>
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        <PersonNm>Nicole Cavender</PersonNm>
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        <PersonNm>Kelly Vantine</PersonNm>
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        <PersonNm>Richard Hootman</PersonNm>
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        <PersonNm>Gary Watson</PersonNm>
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        <PersonNm>Sai Ravichandran</PersonNm>
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          <USAddress>
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          <BusinessName>
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        <ContractorName>
          <BusinessName>
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        <EOYAmt>38889199</EOYAmt>
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        <FormAndLineReferenceDesc>Part III, Line 1a:</FormAndLineReferenceDesc>
        <ExplanationTxt>Capitalization Policy: Arboretum Collections - The Arboretum's rare books and print collections are not capitalized in the accompanying audited financial statements. Living woody plants are also not capitalized unless they are a major part of a capital project. Purchases of collection items that are not capitalized are recorded as decreases in unrestricted net assets.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Part III, Line 4:</FormAndLineReferenceDesc>
        <ExplanationTxt>Description of Collections and Furtherance of Exempt Purpose: Living Collection - Woody plants in categories of taxonomic, geographic, special habitat, horticultural, rare/endangered. 190,000 specimens represent 4,200 different kinds of trees, shrubs and other plants from 40 countries in the northern temperate zone. Displayed across 1,700 acres of natural landscapes. Provided for botanical, horticultural, and artistic study (education and research purpose) and enjoyment of plant species(specific research purpose). Library Collection - 27,000 volumes on botany, horticulture, landscape design, natural history, ecology; corresponding rare documents, and other printed materials; 12,000 botanical artworks and 3,400 landscape drawings. Available for botanical, horticultural, and artistic study of plants (educational, research, and cultural purposes).</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Part V, Line 4:</FormAndLineReferenceDesc>
        <ExplanationTxt>Intended Use of Endowment Funds: The term endowments are spent per the donor's directions. The permanent endowment is maintained in perpetuity to support the mission and operations of the Arboretum. The board designated endowments are applied to purposes defined by the board in support of the mission and operations of the Arboretum.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Part X, Line 2:</FormAndLineReferenceDesc>
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        <FormAndLineReferenceDesc>Part XI, Line 2d - Other Adjustments:</FormAndLineReferenceDesc>
        <ExplanationTxt>Investment management fees of $172,133 are netted against -172,133. investment income on the audited financial statements. Pension related adjustment of $732,146 included in revenue 732,146. on the audited financial statements.</ExplanationTxt>
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        <FormAndLineReferenceDesc>Part XI, Line 4b - Other Adjustments:</FormAndLineReferenceDesc>
        <ExplanationTxt>Cost of Sales of $2,080,036 are included in expenses on the -2,080,036. audited financial statements. Fundraising expenses of $112,867 are included in expenses -112,867. on the audited financial statements.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Part XII, Line 2d - Other Adjustments:</FormAndLineReferenceDesc>
        <ExplanationTxt>Cost of Sales of $2,080,036 are included in expenses on the 2,080,036. audited financial statements. Fundraising expenses of $112,867 are included in expenses 112,867. on the audited financial statements. Pension related adjustment of $732,146 included in revenue 732,146. on the audited financial statements.</ExplanationTxt>
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        <FormAndLineReferenceDesc>Part XII, Line 4b - Other Adjustments:</FormAndLineReferenceDesc>
        <ExplanationTxt>Investment management fees of $172,133 are netted against 172,133. investment income on the audited financial statements.</ExplanationTxt>
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      </RecipientTable>
      <RecipientTable>
        <RecipientBusinessName>
          <BusinessNameLine1>Village of Burr Ridge</BusinessNameLine1>
        </RecipientBusinessName>
        <USAddress>
          <AddressLine1>451 Commerce Street</AddressLine1>
          <City>Burr Ridge</City>
          <State>IL</State>
          <ZIPCode>60527</ZIPCode>
        </USAddress>
        <RecipientEIN>362517422</RecipientEIN>
        <CashGrantAmt>20000</CashGrantAmt>
        <PurposeOfGrantTxt>Tree Replenishment Grant</PurposeOfGrantTxt>
      </RecipientTable>
      <RecipientTable>
        <RecipientBusinessName>
          <BusinessNameLine1>Village of Channahon</BusinessNameLine1>
        </RecipientBusinessName>
        <USAddress>
          <AddressLine1>24555 S Navajo Drive</AddressLine1>
          <City>Channahon</City>
          <State>IL</State>
          <ZIPCode>60410</ZIPCode>
        </USAddress>
        <RecipientEIN>362597211</RecipientEIN>
        <CashGrantAmt>18030</CashGrantAmt>
        <PurposeOfGrantTxt>Tree Replenishment Grant</PurposeOfGrantTxt>
      </RecipientTable>
      <RecipientTable>
        <RecipientBusinessName>
          <BusinessNameLine1>Village of Elk Grove</BusinessNameLine1>
        </RecipientBusinessName>
        <USAddress>
          <AddressLine1>600 Landmeier Road</AddressLine1>
          <City>Elk Grove</City>
          <State>IL</State>
          <ZIPCode>60007</ZIPCode>
        </USAddress>
        <RecipientEIN>366009201</RecipientEIN>
        <CashGrantAmt>20000</CashGrantAmt>
        <PurposeOfGrantTxt>Tree Replenishment Grant</PurposeOfGrantTxt>
      </RecipientTable>
      <RecipientTable>
        <RecipientBusinessName>
          <BusinessNameLine1>Village of Huntley</BusinessNameLine1>
        </RecipientBusinessName>
        <USAddress>
          <AddressLine1>1987 Main Street</AddressLine1>
          <City>Huntley</City>
          <State>IL</State>
          <ZIPCode>60142</ZIPCode>
        </USAddress>
        <RecipientEIN>366005934</RecipientEIN>
        <CashGrantAmt>10000</CashGrantAmt>
        <PurposeOfGrantTxt>Tree Replenishment Grant</PurposeOfGrantTxt>
      </RecipientTable>
      <RecipientTable>
        <RecipientBusinessName>
          <BusinessNameLine1>Village of Lombard</BusinessNameLine1>
        </RecipientBusinessName>
        <USAddress>
          <AddressLine1>255 E Wilson</AddressLine1>
          <City>Lombard</City>
          <State>IL</State>
          <ZIPCode>60148</ZIPCode>
        </USAddress>
        <RecipientEIN>366005975</RecipientEIN>
        <CashGrantAmt>19868</CashGrantAmt>
        <PurposeOfGrantTxt>Tree Replenishment Grant</PurposeOfGrantTxt>
      </RecipientTable>
      <RecipientTable>
        <RecipientBusinessName>
          <BusinessNameLine1>Village of Manhattan</BusinessNameLine1>
        </RecipientBusinessName>
        <USAddress>
          <AddressLine1>245 S State Street</AddressLine1>
          <City>Manhattan</City>
          <State>IL</State>
          <ZIPCode>60442</ZIPCode>
        </USAddress>
        <RecipientEIN>362686751</RecipientEIN>
        <CashGrantAmt>10000</CashGrantAmt>
        <PurposeOfGrantTxt>Tree Replenishment Grant</PurposeOfGrantTxt>
      </RecipientTable>
      <RecipientTable>
        <RecipientBusinessName>
          <BusinessNameLine1>Village of Villa Park</BusinessNameLine1>
        </RecipientBusinessName>
        <USAddress>
          <AddressLine1>20 South Ardmore Ave</AddressLine1>
          <City>Villa Park</City>
          <State>IL</State>
          <ZIPCode>60181</ZIPCode>
        </USAddress>
        <RecipientEIN>366006132</RecipientEIN>
        <CashGrantAmt>8000</CashGrantAmt>
        <PurposeOfGrantTxt>Tree Replenishment Grant</PurposeOfGrantTxt>
      </RecipientTable>
      <RecipientTable>
        <RecipientBusinessName>
          <BusinessNameLine1>West Chicago Park District</BusinessNameLine1>
        </RecipientBusinessName>
        <USAddress>
          <AddressLine1>157 W Washington Street</AddressLine1>
          <City>West Chicago</City>
          <State>IL</State>
          <ZIPCode>60185</ZIPCode>
        </USAddress>
        <RecipientEIN>362762236</RecipientEIN>
        <CashGrantAmt>10000</CashGrantAmt>
        <PurposeOfGrantTxt>Tree Replenishment Grant</PurposeOfGrantTxt>
      </RecipientTable>
      <Total501c3OrgCnt>20</Total501c3OrgCnt>
      <TotalOtherOrgCnt>0</TotalOtherOrgCnt>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Part I, Line 2:</FormAndLineReferenceDesc>
        <ExplanationTxt>On a quarterly basis, grantees are asked to report on project progress using a template provided with the application process. Failure to comply may result in the cancellation of the grant. A final report is required with a final budget form and match documentation worksheet. Payment is made only to the contracted entity for invoices paid by the grant recipients after the completed reimbursement request forms have been received along with valid invoices and/or canceled checks. Only one reimbursement payment will be made to the contracted community upon completion of all phases of the grant project.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleI>
    <IRS990ScheduleJ documentId="RetDoc1042400001">
      <IdemnificationGrossUpPmtsInd>X</IdemnificationGrossUpPmtsInd>
      <HousingAllowanceOrResidenceInd>X</HousingAllowanceOrResidenceInd>
      <WrittenPolicyRefTAndEExpnssInd>1</WrittenPolicyRefTAndEExpnssInd>
      <SubstantiationRequiredInd>1</SubstantiationRequiredInd>
      <CompensationCommitteeInd>X</CompensationCommitteeInd>
      <Form990OfOtherOrganizationsInd>X</Form990OfOtherOrganizationsInd>
      <CompensationSurveyInd>X</CompensationSurveyInd>
      <BoardOrCommitteeApprovalInd>X</BoardOrCommitteeApprovalInd>
      <SeverancePaymentInd>0</SeverancePaymentInd>
      <SupplementalNonqualRtrPlanInd>1</SupplementalNonqualRtrPlanInd>
      <EquityBasedCompArrngmInd>0</EquityBasedCompArrngmInd>
      <CompBasedOnRevenueOfFlngOrgInd>0</CompBasedOnRevenueOfFlngOrgInd>
      <CompBsdOnRevRelatedOrgsInd>0</CompBsdOnRevRelatedOrgsInd>
      <CompBsdNetEarnsFlngOrgInd>0</CompBsdNetEarnsFlngOrgInd>
      <CompBsdNetEarnsRltdOrgsInd>0</CompBsdNetEarnsRltdOrgsInd>
      <AnyNonFixedPaymentsInd>0</AnyNonFixedPaymentsInd>
      <InitialContractExceptionInd>0</InitialContractExceptionInd>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>Gerard T Donnelly PhD</PersonNm>
        <TitleTxt>President and CEO</TitleTxt>
        <BaseCompensationFilingOrgAmt>299426</BaseCompensationFilingOrgAmt>
        <CompensationBasedOnRltdOrgsAmt>0</CompensationBasedOnRltdOrgsAmt>
        <BonusFilingOrganizationAmount>0</BonusFilingOrganizationAmount>
        <BonusRelatedOrganizationsAmt>0</BonusRelatedOrganizationsAmt>
        <OtherCompensationFilingOrgAmt>18699</OtherCompensationFilingOrgAmt>
        <OtherCompensationRltdOrgsAmt>0</OtherCompensationRltdOrgsAmt>
        <DeferredCompensationFlngOrgAmt>48507</DeferredCompensationFlngOrgAmt>
        <DeferredCompRltdOrgsAmt>0</DeferredCompRltdOrgsAmt>
        <NontaxableBenefitsFilingOrgAmt>20071</NontaxableBenefitsFilingOrgAmt>
        <NontaxableBenefitsRltdOrgsAmt>0</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>386703</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>Timothy E WolkoberCPA</PersonNm>
        <TitleTxt>VP of Finance and CFO</TitleTxt>
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        <OtherCompensationFilingOrgAmt>0</OtherCompensationFilingOrgAmt>
        <OtherCompensationRltdOrgsAmt>0</OtherCompensationRltdOrgsAmt>
        <DeferredCompensationFlngOrgAmt>46072</DeferredCompensationFlngOrgAmt>
        <DeferredCompRltdOrgsAmt>0</DeferredCompRltdOrgsAmt>
        <NontaxableBenefitsFilingOrgAmt>14302</NontaxableBenefitsFilingOrgAmt>
        <NontaxableBenefitsRltdOrgsAmt>0</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>218172</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>Jill Koski</PersonNm>
        <TitleTxt>VP of Development</TitleTxt>
        <BaseCompensationFilingOrgAmt>188848</BaseCompensationFilingOrgAmt>
        <CompensationBasedOnRltdOrgsAmt>0</CompensationBasedOnRltdOrgsAmt>
        <BonusFilingOrganizationAmount>0</BonusFilingOrganizationAmount>
        <BonusRelatedOrganizationsAmt>0</BonusRelatedOrganizationsAmt>
        <OtherCompensationFilingOrgAmt>0</OtherCompensationFilingOrgAmt>
        <OtherCompensationRltdOrgsAmt>0</OtherCompensationRltdOrgsAmt>
        <DeferredCompensationFlngOrgAmt>12250</DeferredCompensationFlngOrgAmt>
        <DeferredCompRltdOrgsAmt>0</DeferredCompRltdOrgsAmt>
        <NontaxableBenefitsFilingOrgAmt>20071</NontaxableBenefitsFilingOrgAmt>
        <NontaxableBenefitsRltdOrgsAmt>0</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>221169</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>Susan Wagner</PersonNm>
        <TitleTxt>VP of Education &amp; Information</TitleTxt>
        <BaseCompensationFilingOrgAmt>153488</BaseCompensationFilingOrgAmt>
        <CompensationBasedOnRltdOrgsAmt>0</CompensationBasedOnRltdOrgsAmt>
        <BonusFilingOrganizationAmount>0</BonusFilingOrganizationAmount>
        <BonusRelatedOrganizationsAmt>0</BonusRelatedOrganizationsAmt>
        <OtherCompensationFilingOrgAmt>0</OtherCompensationFilingOrgAmt>
        <OtherCompensationRltdOrgsAmt>0</OtherCompensationRltdOrgsAmt>
        <DeferredCompensationFlngOrgAmt>9250</DeferredCompensationFlngOrgAmt>
        <DeferredCompRltdOrgsAmt>0</DeferredCompRltdOrgsAmt>
        <NontaxableBenefitsFilingOrgAmt>1000</NontaxableBenefitsFilingOrgAmt>
        <NontaxableBenefitsRltdOrgsAmt>0</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>163738</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>Kris Bachtell</PersonNm>
        <TitleTxt>VP of Collections &amp; Facilities</TitleTxt>
        <BaseCompensationFilingOrgAmt>138537</BaseCompensationFilingOrgAmt>
        <CompensationBasedOnRltdOrgsAmt>0</CompensationBasedOnRltdOrgsAmt>
        <BonusFilingOrganizationAmount>0</BonusFilingOrganizationAmount>
        <BonusRelatedOrganizationsAmt>0</BonusRelatedOrganizationsAmt>
        <OtherCompensationFilingOrgAmt>0</OtherCompensationFilingOrgAmt>
        <OtherCompensationRltdOrgsAmt>0</OtherCompensationRltdOrgsAmt>
        <DeferredCompensationFlngOrgAmt>26435</DeferredCompensationFlngOrgAmt>
        <DeferredCompRltdOrgsAmt>0</DeferredCompRltdOrgsAmt>
        <NontaxableBenefitsFilingOrgAmt>18645</NontaxableBenefitsFilingOrgAmt>
        <NontaxableBenefitsRltdOrgsAmt>0</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>183617</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>Jennifer Goodsmith</PersonNm>
        <TitleTxt>VP of Marketing and Communications</TitleTxt>
        <BaseCompensationFilingOrgAmt>142854</BaseCompensationFilingOrgAmt>
        <CompensationBasedOnRltdOrgsAmt>0</CompensationBasedOnRltdOrgsAmt>
        <BonusFilingOrganizationAmount>0</BonusFilingOrganizationAmount>
        <BonusRelatedOrganizationsAmt>0</BonusRelatedOrganizationsAmt>
        <OtherCompensationFilingOrgAmt>0</OtherCompensationFilingOrgAmt>
        <OtherCompensationRltdOrgsAmt>0</OtherCompensationRltdOrgsAmt>
        <DeferredCompensationFlngOrgAmt>4448</DeferredCompensationFlngOrgAmt>
        <DeferredCompRltdOrgsAmt>0</DeferredCompRltdOrgsAmt>
        <NontaxableBenefitsFilingOrgAmt>18071</NontaxableBenefitsFilingOrgAmt>
        <NontaxableBenefitsRltdOrgsAmt>0</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>165373</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Part I, Line 1a</FormAndLineReferenceDesc>
        <ExplanationTxt>Compensation of the President and CEO of the Arboretum, currently Gerard T. Donnelly, includes an educational allowance for college undergraduate tuition and fees for his children. Charges related to room and board are not covered. Reimbursement is net of any scholarship amount. The reimbursement is on a tax indemnification and gross-up basis and treated as taxable compensation. This is a benefit as provided for in the employment agreement upon hire. An on-site residence is provided for the President and CEO of the Arboretum, currently Gerard T. Donnelly, as a condition of employment and for the convenience of the Arboretum. The value of this residence is not treated as taxable compensation.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Part I, Line 4b</FormAndLineReferenceDesc>
        <ExplanationTxt>Part 1, line 4b: The following individuals participated in a section 457(b) Supplemental Non-Qualified Retirement Plan. The individuals are listed with the respective amounts of their deferrals: Gerard Donnelly - $17,500 Timothy Wolkober - $17,500 Kris Bachtell - $2,600</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleJ>
    <IRS990ScheduleK documentId="RetDoc1053100001">
      <TaxExemptBondsIssuesGrp>
        <BondReferenceCd>A</BondReferenceCd>
        <IssuerName>
          <BusinessNameLine1>The County of Dupage Illinois</BusinessNameLine1>
        </IssuerName>
        <BondIssuerEIN>366006551</BondIssuerEIN>
        <CUSIPNum>262668AC0</CUSIPNum>
        <BondIssuedDt>2003-12-17</BondIssuedDt>
        <IssuePriceAmt>42000000</IssuePriceAmt>
        <PurposeDesc>See Part VI, Supplemental Information</PurposeDesc>
        <DefeasedInd>0</DefeasedInd>
        <OnBehalfOfIssuerInd>0</OnBehalfOfIssuerInd>
        <PoolFinancingInd>0</PoolFinancingInd>
      </TaxExemptBondsIssuesGrp>
      <TaxExemptBondsProceedsGrp>
        <BondReferenceCd>A</BondReferenceCd>
        <TotalProceedsAmt>42155070</TotalProceedsAmt>
        <IssuanceCostsFromProceedsAmt>326250</IssuanceCostsFromProceedsAmt>
        <WorkingCapitalExpendituresAmt>1482400</WorkingCapitalExpendituresAmt>
        <CapitalExpendituresAmt>40346420</CapitalExpendituresAmt>
        <SubstantialCompletionYr>2005</SubstantialCompletionYr>
        <CurrentRefundingInd>0</CurrentRefundingInd>
        <AdvanceRefundingInd>0</AdvanceRefundingInd>
        <FinalAllocationMadeInd>1</FinalAllocationMadeInd>
        <AdequateBooksAndRecMaintInd>1</AdequateBooksAndRecMaintInd>
      </TaxExemptBondsProceedsGrp>
      <TaxExemptBondsPrivateBusUseGrp>
        <BondReferenceCd>A</BondReferenceCd>
        <OwningBondFinancedPropertyInd>0</OwningBondFinancedPropertyInd>
        <AnyLeaseArrangementsInd>0</AnyLeaseArrangementsInd>
        <MgmtContractBondFincdPropInd>0</MgmtContractBondFincdPropInd>
        <AnyResearchAgreementsInd>0</AnyResearchAgreementsInd>
        <BondIssMeetPrvtSecPymtTestInd>0</BondIssMeetPrvtSecPymtTestInd>
        <ChangeInUseBondFinancedPropInd>0</ChangeInUseBondFinancedPropInd>
        <ProcsNonqualifiedBondRemdtdInd>1</ProcsNonqualifiedBondRemdtdInd>
      </TaxExemptBondsPrivateBusUseGrp>
      <TaxExemptBondsArbitrageGrp>
        <BondReferenceCd>A</BondReferenceCd>
        <Form8038TFiledInd>0</Form8038TFiledInd>
        <RebateNotDueYetInd>0</RebateNotDueYetInd>
        <ExceptionToRebateInd>1</ExceptionToRebateInd>
        <NoRebateDueInd>0</NoRebateDueInd>
        <VariableRateIssueInd>1</VariableRateIssueInd>
        <HedgeIdentifiedInBksAndRecInd>0</HedgeIdentifiedInBksAndRecInd>
        <GrossProceedsInvestedInGICInd>1</GrossProceedsInvestedInGICInd>
        <GICProviderName>
          <BusinessNameLine1>CITIGROUP GLOBAL</BusinessNameLine1>
          <BusinessNameLine2>MARKETS</BusinessNameLine2>
        </GICProviderName>
        <TermOfGICPct>1.500000000000</TermOfGICPct>
        <RegulatorySafeHarborStsfdInd>1</RegulatorySafeHarborStsfdInd>
        <GrossProceedsInvestedInd>0</GrossProceedsInvestedInd>
        <WrittenProcToMonitorReqsInd>0</WrittenProcToMonitorReqsInd>
      </TaxExemptBondsArbitrageGrp>
      <ProceduresCorrectiveActionGrp>
        <BondReferenceCd>A</BondReferenceCd>
        <ProceduresCorrectiveActionInd>0</ProceduresCorrectiveActionInd>
      </ProceduresCorrectiveActionGrp>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>SCHEDULE K. PART I. LINE A. COLUMN F</FormAndLineReferenceDesc>
        <ExplanationTxt>The proceeds of the bonds were used for (i) the costs of certain capital improvements to the facilities of the borrower located in Lisle, Illinois, including (a) the construction of a Visitor Center and Tram Road; (b) visitor facilities and a Prairie Visitor Station, (c) the expansion and improvement of the main entrance to The Morton Arboretum, (d) the restoration of the riverbank, (e) the construction of parking lots and support facilities, (f) the construction of a children's garden, maze garden, Arbor Court and Meadow Lake courtyard facilities and (g) landscaping, storm water facility and related improvements, (ii) paying a portion of the interest to accrue on the bonds and (iii) paying a portion of certain expenses incurred in connection with the issuance of the bonds.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>SCHEDULE K. PART IV. LINE 1</FormAndLineReferenceDesc>
        <ExplanationTxt>No; there was no arbitrage rebate or penalty due. The net rebate liability was negative.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleK>
    <IRS990ScheduleM documentId="RetDoc1042900001">
      <SecuritiesPubliclyTradedGrp>
        <NonCashCheckboxInd>X</NonCashCheckboxInd>
        <ContributionCnt>13</ContributionCnt>
        <NoncashContributionsRptF990Amt>261618</NoncashContributionsRptF990Amt>
        <MethodOfDeterminingRevenuesTxt>Fair Market Value</MethodOfDeterminingRevenuesTxt>
      </SecuritiesPubliclyTradedGrp>
      <OtherNonCashContriTableGrp>
        <NonCashCheckboxInd>X</NonCashCheckboxInd>
        <Desc>Potting Soil</Desc>
        <ContributionCnt>1</ContributionCnt>
        <NoncashContributionsRptF990Amt>5800</NoncashContributionsRptF990Amt>
        <MethodOfDeterminingRevenuesTxt>Fair Market Value</MethodOfDeterminingRevenuesTxt>
      </OtherNonCashContriTableGrp>
      <OtherNonCashContriTableGrp>
        <NonCashCheckboxInd>X</NonCashCheckboxInd>
        <Desc>Restroom Serv</Desc>
        <ContributionCnt>1</ContributionCnt>
        <NoncashContributionsRptF990Amt>5200</NoncashContributionsRptF990Amt>
        <MethodOfDeterminingRevenuesTxt>Fair Market Value</MethodOfDeterminingRevenuesTxt>
      </OtherNonCashContriTableGrp>
      <OtherNonCashContriTableGrp>
        <NonCashCheckboxInd>X</NonCashCheckboxInd>
        <Desc>Event Prizes</Desc>
        <ContributionCnt>1</ContributionCnt>
        <NoncashContributionsRptF990Amt>1100</NoncashContributionsRptF990Amt>
        <MethodOfDeterminingRevenuesTxt>Fair Market Value</MethodOfDeterminingRevenuesTxt>
      </OtherNonCashContriTableGrp>
      <AnyPropertyThatMustBeHeldInd>0</AnyPropertyThatMustBeHeldInd>
      <ReviewProcessUnusualNCGiftsInd>1</ReviewProcessUnusualNCGiftsInd>
      <ThirdPartiesUsedInd>0</ThirdPartiesUsedInd>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Part I, Column (b):</FormAndLineReferenceDesc>
        <ExplanationTxt>The organization is reporting in Part I, Column (b), the number of contributions.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleM>
    <IRS990ScheduleO documentId="RetDoc1044400001">
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section B, line 11</FormAndLineReferenceDesc>
        <ExplanationTxt>Form 990 is prepared by the Arboretum's accountants, reviewed by the Audit Committee and distributed to the Board of Trustees prior to filing.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section B, line 12c</FormAndLineReferenceDesc>
        <ExplanationTxt>The Morton Arboretum requires that all trustees, employees, and volunteers disclose and declare any personal, familial, or business relationships, situations, or activities that have the potential to create a conflict of interest or the perception of a conflict of interest. For trustees and employees, the declaration must be renewed annually or when applicable changes in status occur. The Arboretum supplies a Conflict of Interest Declaration form to all trustees and employees for this purpose. Volunteers are informed of this policy at the onset of their service, in the published volunteer handbook, and in periodic communications. For all trustees, employees, and volunteers, relationships or situations that arise that may create or appear to create a conflict of interest must be brought to the attention of the President or the Chairman of the Board of Trustees.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section B, line 15</FormAndLineReferenceDesc>
        <ExplanationTxt>The process for determining compensation of officers and key employees includes a market analysis of comparable positions from peer gardens and other similar organizations for benchmarking purposes. This information is reviewed by internal Human Resources professionals and the compensation committee of the Board of Trustees. The full Board reviews and approves recommendations of compensation matters for the President and CEO. The compensation of other officers and key employees is reviewed by the compensation committee of the Board.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section C, line 19</FormAndLineReferenceDesc>
        <ExplanationTxt>Financial statements are available to the public on the Arborrtum's website (www.mortonarb.org) and Annual Report. Governing documents and Conflict of Interest Policy are available upon request.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleO>
  </ReturnData>
</Return>