Orbexilum stipulatum
Plants
Charles Wilkins Short · public_domain
About
Orbexilum stipulatum, the largestipule leather-root or Falls-of-the-Ohio scurfpea, was a flowering plant that was endemic to Rock Island in the Falls of the Ohio; an area of rapids and rocky limestone outcrops in Kentucky's portion of the Ohio River. No live individuals have been found since 1881 and it is presumed to be extinct.
Summary from Wikipedia
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Growing details and traits for Orbexilum stipulatum in the Library.
No cultivars in the Library yet — the full profile above covers the species itself.