Flora of North America species comparison

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Phaseolus acutifolius var. tenuifolius
Photo is of parent taxon

tepary bean
Leaflet

blades linear to lanceolate, terminal ones 3.5–11.5 × 0.3–2.3 cm, base truncate to subtruncate, apex acute to attenuate, often weakly to conspicuously lobed at base.
Legumes

32–54 × 5–6 mm.
Seeds

3–6, 3–4.5 × 2.5–4.5 mm.
2n

= 22.

Phaseolus acutifolius var. tenuifolius
Phenology Flowering Jun–Nov.
Habitat Open pine-oak forests, mesquite thickets, grasslands, chaparral, scrub, igneous or lime­stone soils.
Elevation 200–2000 m. (700–6600 ft.)
Distribution
from FNA
AZ; NM; TX; Mexico (Baja California Sur, Chihuahua, Coahuila, Colima, Durango, Jalisco, Sinaloa, Sonora)
[BONAP county map]
Discussion

Variety tenuifolius is found in central and southeastern Arizona, Doña Ana and Hidalgo counties in New Mexico, and El Paso and Jeff Davis counties in Texas.

Phaseolus angustissimus occurs within the range of var. tenuifolius and might be confused with it. Plants of var. tenuifolius can be distinguished from P. angustissimus by their fibrous roots and many-seeded pods.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 11.
Parent taxa Fabaceae > subfam. Faboideae > Phaseolus > Phaseolus acutifolius
Sibling taxa
P. acutifolius var. acutifolius
Synonyms P. montanus, P. tenuifolius
Name authority A. Gray: Smithsonian Contr. Knowl. 5(6): 33. (1853)
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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