Astragalus conjunctus var. conjunctus
Astragalus conjunctus var. rickardii
basalt milkvetch, Idaho milkvetch, John Day Valley milkvetch, stiff milkvetch
Idaho milkvetch, rickard's milkvetch, stiff milk-vetch
7–17(–20)-flowered;
axis (3–)4–12(–15) cm in fruit.
10–19-flowered;
axis 4–13 cm in fruit.
10–33 cm.
5–26 cm.
1–4.5 mm.
1–2.5 mm.
16–25.5 mm;
calyx cylindric or subcylindric, (7–)8.5–12 mm, tube (5.7–)6–9.2 mm, lobes 1.3–3(–4) mm.
15–18.5 mm;
calyx campanulate, 7–9 mm, tube 4.9–6.2 mm, lobes 1.5–3 mm.
12–25 × 5–8 mm, glabrous.
13–20 × 4.3–5 mm, strigulose.
23–30.
15–20.
= 24.
Astragalus conjunctus var. conjunctus
Astragalus conjunctus var. rickardii
Variety conjunctus is most easily recognized in bloom, the long, narrow flowers, with their cylindric calyces and, usually, lilac- or purple-tinged petals being diagnostic. When in fruit, it is easily confused with the narrow-fruited form of Astragalus reventiformis, a species of the inner slope of the Cascade Range in Washington.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
Variety rickardii was once thought to be confined to the Hanford Atomic Energy Site, Benton County, Washington, but has more recently been documented in Wasco County, Oregon. Although plants of var. rickardii contrast in features relative to other members of the complex, it appears to be most closely related to var. conjunctus despite its strigulose fruits, shorter fruiting pedicels, and smaller floral parts.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
OR
Flora NW
PNW Herbaria
WildflowerSearch
iNaturalist
USDA Plants Database
WA
