Astragalus bisulcatus var. haydenianus
Astragalus bisulcatus var. major
Hayden's milkvetch
Johnson Canyon milkvetch, twogrooved milkvetch
(13–)21–35, 5–27 mm.
15–19, (5–)10–25 mm.
35–80-flowered;
axis (4–)5.5–25 cm in fruit;
bracts (2.5–)3–5 mm.
20–34-flowered;
axis 3–9 cm in fruit;
bracts 2.5–4 mm.
8–11 mm;
calyx usually pallid, tube 3.1–4 mm, lobes 1–2.7 mm;
corolla white or whitish to ochroleucous;
banner longer than keel.
11–15 mm;
calyx usually white, tube 3.5–5.5(–7) mm, lobes narrowly subulate, (1.5–)1.8–3.8 mm;
corolla white or whitish and keel tip maculate, banner sometimes with purple center and purple lines, or suffused with pale purple throughout;
banner longer than keel.
ellipsoid or oblong-ellipsoid, (5–)6.5–9.5 × 2–4 mm, transversely rugose-reticulate, strigulose;
stipe 1.4–3 mm.
linear- or narrowly oblong-ellipsoid, 8–13.5 × 2.2–3.7 mm, smooth, glabrous or strigulose;
stipe 4–5.2 mm.
5–8.
4–10.
= 24.
= 24.
Astragalus bisulcatus var. haydenianus
Astragalus bisulcatus var. major
Variety haydenianus from the Wasatch Plateau in Utah has been confused by some workers with the similarly pale-flowered var. major, but the flowers are consistently smaller, much more numerous, and the fruits smaller than in var. major.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
The concept of var. major is here expanded to include the so-called basin variants of R. C. Barneby (1964), which occur from southern Wyoming through western Colorado and eastern and southern Utah. These are a diverse lot of pale-flowered populations, each of which varies toward smaller flowers and fruits than are present in var. bisulcatus.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
SW CO Wildflowers
WildflowerSearch
iNaturalist
USDA Plants Database
PNW Herbaria
