Flora of North America species comparison

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Astragalus iodanthus var. diaphanoides
Photo is of parent taxon

Snake milkvetch, violet milkvetch, viper milkvetch
Stems

usually finely cinereous.
Leaflets

(7 or)9–13(or 15).
Flowers

calyx (3.3–)3.7–5.3 mm, tube 2.6–3.2 × 1.7–2.6(–2.9) mm, lobes (0.6–)1–2.2 mm;

corolla pale lilac, keel tip usually darker lilac;

banner 9–11.5 mm;

wings shorter or slightly longer than keel.
Legumes

folded back on itself, mostly 3-sided compressed, (20–)25–35(–40) × (2.5–)3–5.5(–6) mm.
Seeds

14–24.
2n

= 22.

Astragalus iodanthus var. diaphanoides
Phenology Flowering Apr–Jun.
Habitat Alkaline clay or loam soils, often with sagebrush or juniper.
Elevation 700–2100 m. (2300–6900 ft.)
Distribution
from FNA
CA; ID; NV; OR
[BONAP county map]
Discussion

Variety diaphanoides is known from Lassen County in California, along the Bruneau, Malheur, Owyhee, and Snake rivers in Elmore, Owyhee, and Twin Falls counties in Idaho, Washoe County in Nevada, and Deschutes, Harney, and Malheur counties in Oregon.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 11.
Parent taxa Fabaceae > subfam. Faboideae > Astragalus > sect. Diphysi > Astragalus iodanthus
Sibling taxa
A. iodanthus var. iodanthus
Synonyms A. iodanthus var. vipereus
Name authority Barneby: Leafl. W. Bot. 4: 50, figs. 20–23. (1944)
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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