Oxytropis sericea var. sericea
Oxytropis sericea
silky crazyweed, silky locoweed, white locoweed
silky locoweed, white locoweed, whitepoint crazyweed
6–28 cm;
stipules glabrous or densely pilose abaxially;
leaflets (9 or)11–19(or 21).
6–28 cm;
stipules membranous, light tan or grayish, 8–22 mm, free ends acuminate, pilose, villous, glabrate, or glabrous abaxially, margins ciliate or eciliate;
leaflets 7–19(or 21), opposite, subopposite, or scattered, blades ovate to elliptic, oblong, or lanceolate, (4–)7–32(–40) × (1.5–)4–9(–10) mm, apex acute, surfaces sericeous, often densely so.
5–20+-flowered.
5–20+-flowered, subcapitate to elongate.
7–30 cm, axis 1.5–18 cm in fruit.
erect, 7–30 cm, sericeous;
bract lanceolate, shorter than flowers, pilose.
white or yellowish, fading whitish or yellowish, or polychrome in populations, 18–27(–28) mm, keel tip maculate.
white to yellowish, keel tip maculate or not, 17–27(–28) mm.
9–12 mm, tube 6.5–9 mm, lobes 2.5–4 mm.
cylindric, 7–12 mm, pilose, hairs black and white, lobes dark hairy;
tube 6.5–9 mm, lobes 2–4 mm.
15–22 × 5–7 mm.
erect, sessile, subcylindric to ovoid-oblong, 15–24 × 4.5–7 mm, ± bilocular, fleshy when fresh, becoming leathery or almost woody and rigid, strigose or pilosulous.
= 24, 48.
Oxytropis sericea var. sericea
Oxytropis sericea
Variety sericea forms hybrids with Oxytropis lambertii where the two entities come in contact, and occasionally where only one parent is known to occur. Especially impressive hybrid populations occur on the high plains and in outliers of the Rocky Mountains where O. sericea and the montane populations of O. lambertii are sympatric or nearly so. The swarms of hybrids, backcrosses, and derivatives at Nederland, Colorado, are especially distinctive, with floral colors and sizes not readily evident in either of the parental types. Such swarms occur widely at least in Colorado and Wyoming.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
Varieties 2 (2 in the flora).
(Discussion copyrighted by Flora of North America; reprinted with permission.)
1. Corollas white or yellowish, fading whitish or yellowish, or polychrome, keel tips maculate; raceme axis 1.5–18 cm in fruit; s Montana and South Dakota southward. | var. sericea |
1. Corollas whitish or yellowish, fading yellowish, keel tips not maculate; raceme axis often compact, 3–12 cm in fruit; Idaho and n Wyoming northward. | var. speciosa |
OR
CalFlora
Flora NW
KS Wildflowers
PNW Herbaria
WildflowerSearch
iNaturalist
USDA Plants Database
BC
