Strophostyles leiosperma

Strophostyles leiosperma, known as slickseed fuzzybean, or smoothseed / small-flower wildbean[2][3] is a species of herbaceous, vining legume native to the central to western U.S. It occurs west to Colorado and New Mexico, east to Louisiana, south to Mexico, and north to Minnesota.[4][5] It is most easily distinguished from the other two Strophostyles species by the abundance of small silky hairs on its leaves and pods, and small pea-shaped flowers with a much reduced keel that is largely hidden by the wing petals.

Strophostyles leiosperma
Typical flower & pod (Gray Summit, MO)
Scientific classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Rosids
Order: Fabales
Family: Fabaceae
Genus: Strophostyles
Species:
S. leiosperma
Binomial name
Strophostyles leiosperma
(Torr. & A.Gray) Piper
Synonyms[1]
  • Phaseolus leiospermus Torrey & A.Gray) Piper
  • Phaseolus pauciflorus Benth.
  • Strophostyles pauciflora S. Watson

This species is an annual to short-lived perennial. All parts tend to be smaller for S. leiosperma in general than its congeners, and it is a more diminutive plant overall. The leaflets are typically thin and rarely lobed (never deeply lobed). Unlike its congeners, its seeds rarely have a waxy, hairy covering, and it tends to occur in drier sites.[4] Likewise, the specific epithet leiosperma means "smooth seed."[6] It is also the most likely of these species to be capable of self-fertilization.[4]

  • S. leiosperma flower & unripe pod

References
  1. "Tropicos: Strophostyles leiosperma".
  2. "ITIS Standard Report Page: Strophostyles leiosperma". www.itis.gov. Retrieved 2018-09-22.
  3. "Taxonomy - GRIN-Global Web v 1.10.3.6". npgsweb.ars-grin.gov. Retrieved 2018-09-22.
  4. Riley-Hulting, Erin T.; Delgado-Salinas, Alfonso; Lavin, Matt (2004). "Phylogenetic Systematics of Strophostyles (Fabaceae): A North American Temperate Genus within a Neotropical Diversification". Systematic Botany. 29 (3): 627–653. doi:10.1600/0363644041744464. JSTOR 25063997.
  5. "Plants Profile for Strophostyles leiosperma (slickseed fuzzybean)". plants.usda.gov. Retrieved 2018-09-22.
  6. "A Grammatical Dictionary of Botanical Latin". www.mobot.org. Retrieved 2018-09-22.


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