Locality: The Morton Arboretum, Lisle Illinois, U.S.A.

Abstract: This document is a working (i.e., unreviewed and unpublished) checklist of the vascular plants growing outside of cultivation at The Morton Arboretum. It was assembled initially as part of an IMLS-funded Conservation Project Support grant to survey the Arboretum’s wooded natural areas, including the adjacent Hidden Lake Forest Preserve. During this project, the herbarium’s role was to voucher collections made as part of a sampling of the vegetation, and to ground-truth sampling plots. As part of this work, we surveyed the herbarium for all specimens collected on the grounds and have assembled from that survey a working checklist of the plants of the Arboretum for use by staff, volunteers, and anyone else who stumbles across it. The checklist by design excludes all planting growing in cultivation, whether accessioned or not, but is intended to include plants escaped from cultivation or persisting beyond the time of cultivation. Thus, for example, plants planted at Schulenberg Prairie and persisting to the current day are fair game and should be included in this checklist. Because the list was assembled from herbarium specimens, we expect that many species, even common ones, are not yet on the list. The checklist is organized in three major groups: the pteridophytes (ferns and fern allies), followed by monocots and dicots. Within each of those groups, species are organized alphabetically by family, then by genus and species. Nomenclature follows a combination of Flora of North America, USDA Plants, and the vPlants checklist (www.vplants.org). Localities and dates in this version of the checklist are all based on collections in our herbarium (MOR). In future versions of this checklist, descriptions may be expanded to include site records. If you find this useful and note any changes that need to be made (most likely additions), please let Andrew know (ahipp@mortonarb.org). I will update this as I have time.