. Atlas of the rare vascular plants of Ontario. Rare plants; Botany. Atlas of the Rare Vascular Plants of Ontario/Atlas des plantes vasculaires rares de l'Ontario APIACEAE Thasplum trifollatum (L.) Gray ( T. aureum Nutt.) Purple meadow parsnip, woodland nneadow parsnip Panais trifolié. HABITAT: Clay soil of oak-hickory woods and floodplain forests; thickets and woodland edges; and dry, upland woods. STATUS: Rare in Canada. Possibly extirpated in New York; rare in Maryland, Nebraska, and Wisconsin. NOTES: The earliest verified collections of Thaspium trifoliatum from Ontario were made by Macou
. Atlas of the rare vascular plants of Ontario. Rare plants; Botany. Atlas of the Rare Vascular Plants of Ontario/Atlas des plantes vasculaires rares de l'Ontario APIACEAE Thasplum trifollatum (L.) Gray ( T. aureum Nutt.) Purple meadow parsnip, woodland nneadow parsnip Panais trifolié. HABITAT: Clay soil of oak-hickory woods and floodplain forests; thickets and woodland edges; and dry, upland woods. STATUS: Rare in Canada. Possibly extirpated in New York; rare in Maryland, Nebraska, and Wisconsin. NOTES: The earliest verified collections of Thaspium trifoliatum from Ontario were made by Macoun in 1901 and 1902 from "near Amherstburg" (CAN). In 1911 the species was collected on Pelee Island by Dodge (MICH) and in 1967 it was collected by Botham "near Wheatley" (CAN). These specimens were not known to Ball (1979) when he discovered T. trifoliatum at Amherstburg and reported it as the first authentic record of the species in Canada. Earlier published reports of this species from Ontario and the Prairie provinces had been based on misidentified specimens of Zizia aptera (Gray) Fern. Some authors (Cooperrider 1985, Fernald 1950, Mathias & Constance 1944-1945) recognize two varieties of T. trifoliatum: var. trifoliatum has purple flowers and is mainly eastern and Appalachian in distribution; whereas var. flavum Blake has yellow flowers and is more common in the western part of the species range. Flowering specimens verified from Ontario have yellow flowers and so are referable to var. flavum. The two varieties are sometimes regarded as mere color forms (Voss 1985) that do not merit taxonomic ranking. HABITAT: Forêts de chênes et de noyers sur sol argileux et forêts de plaine inondable; orées de fourrés et de boisés; et forêts de hauts plateaux secs. SITUATION: Rare au Canada. Peut-être déracinée dans l'Ãtat de New York; rare au Maryland, Nebraska et Wisconsin. REMARQUES: Les plus anciennes cueillettes vérifié
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Keywords: ., bookcentury1900, bookcollectionbiodiversity, booksubjectbotany
