familyFabaceae
subfamilyFabaceae subfam. Faboideae
genusAstragalus
sectionAstragalus sect. Leptocarpi
speciesAstragalus emoryanus
Astragalus emoryanus var. emoryanus
Treatment appears in FNA Volume 11.
Hairs mostly appressed or subappressed. Peduncles equaling or surpassing leaves. Legumes 12–20(–22) × (2–)2.2–3.3 mm, length 5–6.5 times width. 2n = 22, 24.
Phenology: Flowering Feb–Jun.
Habitat: Larrea, mesquite, grassland, juniper, and mixed desert shrub communities.
Elevation: 10–2200 m.
Distribution
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Ariz., N.Mex., Tex., Utah, Mexico (Chihuahua, Coahuila, Nuevo León, Tamaulipas).
Discussion
The range of var. emoryanus is unusual and tripartite: Kane County, Utah, and northern Arizona; central New Mexico, western Texas, and southward to Nuevo León, Mexico; and Maverick County in the Rio Grande Valley and more or less continuously to near the mouth of the Rio Grande. In the Big Bend region of Texas and adjacent Mexico, it sometimes occurs with var. terlinguensis, without apparent hybridization.
Selected References
None.
Lower Taxa
None.