Flora of North America species comparison

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Astragalus subcinereus var. subcinereus

Astragalus subcinereus var. sileranus
Photo is of parent taxon
Photo is of parent taxon

Siler's milkvetch
Stems

ascending or prostrate, 14–50 cm.

prostrate, 14–60 cm, often conspicuously flexuous.
Flowers

5–9 mm.

5–9 mm.
Legumes

ovoid or ovoid-ellipsoid, bladdery-inflated, length less than 2 times width, relatively broad, usually 6–13 mm wide.

ellipsoid, turgid, not bladdery-inflated, length usually more than 2 times width, 5–8 mm wide (if shorter, less than 7 mm wide and texture leathery).

Astragalus subcinereus var. subcinereus

Astragalus subcinereus var. sileranus
Phenology Flowering May–Sep. Flowering May–Aug.
Habitat Pon­derosa pine, white fir, pinyon-juniper, aspen, and sage­brush communities. Ponderosa pine, aspen, oak, pinyon-juniper, and mixed mountain brush communi­ties.
Elevation 1600–2600 m. (5200–8500 ft.) 1700–2800 m. (5600–9200 ft.)
Distribution
from FNA
AZ; NV; UT
from FNA
NV; UT
Discussion

Variety subcinereus occurs in Coconino and Mohave counties in Arizona, Lincoln County in Nevada, and Garfield, Kane, and Washington counties in Utah.

Much of the material in southern Utah differs from plants in Mohave County, Arizona, in having broader leaflets, longer stems, and more firmly-walled fruits, and has been called Astragalus sileranus var. cariacus. The features are weak and overlapping at best.

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Variety sileranus occurs in Lincoln County in Nevada, and Garfield, Iron, Kane, and eastern Washington counties in Utah.

The main overlap in distribution between vars. subcinereus and sileranus occurs in Lincoln County, Nevada, but still, this variety is most closely allied to the disjunct var. basalticus of central Utah.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 11. FNA vol. 11.
Parent taxa Fabaceae > subfam. Faboideae > Astragalus > sect. Scytocarpi > Astragalus subcinereus Fabaceae > subfam. Faboideae > Astragalus > sect. Scytocarpi > Astragalus subcinereus
Sibling taxa
A. subcinereus var. basalticus, A. subcinereus var. sileranus
A. subcinereus var. basalticus, A. subcinereus var. subcinereus
Synonyms A. sileranus var. cariacus A. sileranus, Phaca sileriana
Name authority unknown (M. E. Jones) S. L. Welsh: Great Basin Naturalist 58: 49. (1998)
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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