Orbexilum stipulatum - (Torr. & Gray) Rydb.
Falls-of-the-Ohio Scurfpea
Synonym(s): Psoralea stipulata Torr. & Gray
Taxonomic Status: Accepted
Related ITIS Name(s): Orbexilum stipulatum (Torr. & Gray) Rydb. (TSN 504050)
Unique Identifier: ELEMENT_GLOBAL.2.147118
Element Code: PDFAB5K050
Informal Taxonomy: Plants, Vascular - Flowering Plants - Pea Family
 
Kingdom Phylum Class Order Family Genus
Plantae Anthophyta Dicotyledoneae Fabales Fabaceae Orbexilum
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Concept Reference
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Concept Reference: Kartesz, J.T. 1994. A synonymized checklist of the vascular flora of the United States, Canada, and Greenland. 2nd edition. 2 vols. Timber Press, Portland, OR.
Concept Reference Code: B94KAR01HQUS
Name Used in Concept Reference: Orbexilum stipulatum
Taxonomic Comments: Treated as Psoralea stipulata in most regional floras; placed in the genus Orbexilum in 1994 Kartesz checklist and 1999 Kartesz "Synthesis of the North American Flora".
Conservation Status
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NatureServe Status

Global Status: GX
Global Status Last Reviewed: 11Dec1998
Global Status Last Changed: 11Dec1998
Rounded Global Status: GX - Presumed Extinct
Reasons: Known only from Rock Island, Kentucky, at the Falls of the Ohio River (at Louisville), where first noted in 1838 and last observed in 1881. (Indiana reports are erroneous; although near the Indiana shore, the island is in Kentucky.) Rock Island itself was mostly inundated with the construction of a dam at this site, and the remaining portion of the island (anchoring a part of the dam) has no original surface remaining. Apparently this plant occurred nowhere else in the world; numerous searches of similar habitat (floodscoured riverbank bedrock, gravel bars, and limestone barrens and glades) on both the Kentucky and Indiana shores of the Ohio River have not relocated it, including intensive searches in 1998. Therefore, the species is believed to be extinct.
Nation: United States
National Status: NX

U.S. & Canada State/Province Status
Due to latency between updates made in state, provincial or other NatureServe Network databases and when they appear on NatureServe Explorer, for state or provincial information you may wish to contact the data steward in your jurisdiction to obtain the most current data. Please refer to our Distribution Data Sources to find contact information for your jurisdiction.
United States Kentucky (SX)

Other Statuses

NatureServe Global Conservation Status Factors

Range Extent Comments: Apparently known only from Rock Island, in the Falls of the Ohio, Kentucky. (The river channel here is wholly within the Commonwealth of Kentucky; the Indiana state line is along the north bank of the river, as defined in the Northwest Ordinance of 1787. Rock Island is apparently the only site where this plant grew, hence the reports for Clark County and/or Floyd County, Indiana, are apparently all erroneous. (Baskin et al., Castanea 51: 207-210, 1986, provide further discussion.) Possibly suitable habitat (floodscoured riverbank bedrock, gravel bars, and limestone barrens and glades) exists nearby in both states, but the plant has not been found despite thorough searches on both sides of the river (D. White, discussion with Larry Morse, 22May98 and 11Dec98).

Number of Occurrences: 1 - 5
Number of Occurrences Comments: Known only from the historic occurrence on Rock Island, in the Ohio River in the Falls of the Ohio, Louisville, Kentucky, where first collected in 1838 and last seen in 1881.

Population Size Comments: None.

Short-term Trend: Decline of >30%
Short-term Trend Comments: Assumed destroyed at Rock Island; no other occurrences known (or ever known).

Intrinsic Vulnerability Comments: Flood-tolerant, but not dynamite-tolerant and perhaps not shade-tolerant.

Other NatureServe Conservation Status Information

Distribution
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Global Range: Apparently known only from Rock Island, in the Falls of the Ohio, Kentucky. (The river channel here is wholly within the Commonwealth of Kentucky; the Indiana state line is along the north bank of the river, as defined in the Northwest Ordinance of 1787. Rock Island is apparently the only site where this plant grew, hence the reports for Clark County and/or Floyd County, Indiana, are apparently all erroneous. (Baskin et al., Castanea 51: 207-210, 1986, provide further discussion.) Possibly suitable habitat (floodscoured riverbank bedrock, gravel bars, and limestone barrens and glades) exists nearby in both states, but the plant has not been found despite thorough searches on both sides of the river (D. White, discussion with Larry Morse, 22May98 and 11Dec98).

U.S. States and Canadian Provinces

Due to latency between updates made in state, provincial or other NatureServe Network databases and when they appear on NatureServe Explorer, for state or provincial information you may wish to contact the data steward in your jurisdiction to obtain the most current data. Please refer to our Distribution Data Sources to find contact information for your jurisdiction.
Color legend for Distribution Map

U.S. & Canada State/Province Distribution
United States KYextirpated

Range Map
No map available.

Ecology & Life History
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Basic Description: A perennial herb with leaves that were divided into 3 leaflets, each about 2 cm long. The species was as characterized by a persistent appendage at the base of the leaves and by a corolla tube that did not extend beyond the calyx. It probably bloomed late May to mid-June.
Habitat Comments: Originally on limestone outcrop in flood-scour zone of a major river rapids (Falls of the Ohio). May also be expected to possibly occur in other limestone glade or barren habitat nearby (as in the case of Solidago shortii, long known only from the Falls of the Ohio but later found in a glade in Kentucky).
Economic Attributes Not yet assessed
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Management Summary Not yet assessed
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Population/Occurrence Delineation Not yet assessed
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Population/Occurrence Viability
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U.S. Invasive Species Impact Rank (I-Rank) Not yet assessed
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Authors/Contributors
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NatureServe Conservation Status Factors Edition Date: 11Dec1998
NatureServe Conservation Status Factors Author: Morse, Larry E. (1995), rev. Morse/Maybury/D. White (1997), rev. L. Morse (1998)

Botanical data developed by NatureServe and its network of natural heritage programs (see Local Programs), The North Carolina Botanical Garden, and other contributors and cooperators (see Sources).

References
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  • Baskin, J.M., D. Isely, and C.C. Baskin. 1986. Geographical origin of the specimens of Orbexilum stipulatum (T.& G.) Rydb. (Psoralea stipulata T.& G.) Castanea 51(3): 207-210.

  • Isely, D. 1990. Vascular flora of the southeastern United States. Vol. 3, Part 2. Leguminosae (Fabaceae). Univ. North Carolina Press, Chapel Hill. 258 pp.

  • Kartesz, J. T. 1991. Synonym names from 1991 checklist, as extracted by Larry Morse, TNC, June 1991.

  • Kartesz, J.T. 1994. A synonymized checklist of the vascular flora of the United States, Canada, and Greenland. 2nd edition. 2 vols. Timber Press, Portland, OR.

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