Orbexilum

Orbexilum, commonly called leather-root,[2] is a genus of flowering plants in the legume family (Fabaceae). They are native to North America, where they are found in the United States and Mexico, south to Chiapas.[3]

Orbexilum
Orbexilum pedunculatum
Scientific classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Rosids
Order: Fabales
Family: Fabaceae
Subfamily: Faboideae
Tribe: Psoraleeae
Genus: Orbexilum
Raf.[1]
Species

See text

This genus can be distinguished from other genera in the Psoraleeae by its "thick glabrous pod walls that are distinctively rugose and by [a] calyx that is scarcely accrescent."[4]

Taxonomy

The genus was described by Constantine Samuel Rafinesque in 1832, with the type species O. latifolia, moved from Psoralea.[5] (O. latifolia is now considered a synonym of O. onobrychis.[6]) Rafinesque differentiated Orbexilum from Psoralea largely on the basis of features of the calyx.[7]

Species

Orbexilum comprises the following species:[1][4]

  • Orbexilum chiapasanum B.L.Turner
  • Orbexilum lupinellus (Michx.) Isely[note 1]
  • †Orbexilum macrophyllum (Rowlee) Rydb. – bigleaf scurfpea[8]
  • Orbexilum melanocarpum (Benth.) Rydb.
  • Orbexilum oliganthum (Brandegee) B.L.Turner
  • Orbexilum onobrychis (Nutt.) Rydb.
  • Orbexilum pedunculatum (Mill.) Rydb.
  • Orbexilum psoralioides (Walter) Vincent, syn. Orbexilum gracile (Torr. & A.Gray) B.L.Turner
  • Orbexilum simplex (Nutt. ex Torr. & A.Gray) Rydb.
  • †Orbexilum stipulatum (Torr. & A.Gray) Rydb.
  • Orbexilum virgatum (Nutt.) Rydb.

Notes
  1. The specific epithet is sometimes incorrectly spelled lupinellum, but is a noun in apposition, so is correctly spelled lupinellus.[note 2]

References
  1. "Orbexilum Raf.". Plants of the World Online. Royal Botanic Gardens, Kew. Retrieved 2021-06-14.
  2. USDA, NRCS (n.d.). "Orbexilum". The PLANTS Database (plants.usda.gov). Greensboro, North Carolina: National Plant Data Team. Retrieved 25 July 2015.
  3. Alan Weakley (2015). "Flora of the Southern and Mid-Atlantic States".
  4. Turner BL. (2008). "Revision of the genus Orbexilum (Fabaceae: Psoraleeae)" (PDF). Lundellia. 11: 1–7.
  5. "Orbexilum". International Plant Names Index (IPNI). Royal Botanic Gardens, Kew. 2021-06-14. Retrieved 2021-06-14.
  6. "Orbexilum latifolia". Plants of the World Online. Royal Botanic Gardens, Kew. Retrieved 2021-06-14.
  7. Rafinesque, C.S. (1832). "107. Twenty new genera of plants from the Oregon mountains, etc". Atlantic Journal, and Friend of Knowledge. 1 (3): 144–146. Retrieved 2021-06-14.
  8. LeGrand, H; Sorrie, B (2021). "Account for Bigleaf Scurfpea". Vascular Plants of North Carolina. North Carolina Biodiversity Project and North Carolina State Parks. Retrieved May 26, 2021.{{cite web}}: CS1 maint: url-status (link)
  9. "Orbexilum lupinellus". International Plant Names Index (IPNI). Royal Botanic Gardens, Kew. 2021-06-14. Retrieved 2021-06-14.


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