familyFabaceae
subfamilyFabaceae subfam. Faboideae
genusAstragalus
sectionAstragalus sect. Argophylli
speciesAstragalus amphioxys
Astragalus amphioxys var. vespertinus
Rev. N.-Amer. Astragalus, 215. 1923.
Common names: Evening milkvetch
Endemic
Basionym: Astragalus vespertinus E. Sheldon Minnesota Bot. Stud. 1: 150. 1894
Treatment appears in FNA Volume 11.
Flowers: calyx cylindric, tube 8.8–13.2 mm, lobes 1.3–3 mm; corolla banner 23–27(–28) mm; keel 19–23.6 mm. Legumes 30–35 mm, gently incurved. Seeds 50–70.
Phenology: Flowering Apr–Jun.
Habitat: Sandy valley floors, ledges under cliffs, gravelly hillsides, in sagebrush or mountain brush communities, pinyon-juniper forests, usually on sandstone.
Elevation: 600–1800(–2000) m.
Distribution
Ariz., Colo., N.Mex., Utah.
Discussion
Variety vespertinus is found locally within the Colorado Basin and occurs from northwestern New Mexico to southwestern Colorado, through southeastern Utah, extending to the Grand Canyon and Kanab Plateau of northwestern Arizona. It is a large-flowered, more or less northern form of the species that is, otherwise, poorly characterized.
Selected References
None.
Lower Taxa
None.
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