Flora of North America species comparison

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Oxytropis sericea var. sericea
Photo is of parent taxon

silky crazyweed, silky locoweed, white locoweed
Habit Plants 14–45 cm.
Leaves

6–28 cm;

stipules glabrous or densely pilose abaxially;

leaflets (9 or)11–19(or 21).
Racemes

5–20+-flowered.
Peduncles

7–30 cm, axis 1.5–18 cm in fruit.
Corollas

white or yellowish, fading whitish or yellowish, or polychrome in populations, 18–27(–28) mm, keel tip maculate.
Calyces

9–12 mm, tube 6.5–9 mm, lobes 2.5–4 mm.
Legumes

15–22 × 5–7 mm.
2n

= 24, 48.

Oxytropis sericea var. sericea
Phenology Flowering spring–early summer(–fall).
Habitat Plains, prai­ries, foothills to mountain summits.
Elevation 600–3100 m. (2000–10200 ft.)
Distribution
from FNA
CO; ID; KS; MT; NE; NM; NV; OK; OR; SD; TX; UT; WY
[BONAP county map]
Discussion

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.)
Source FNA vol. 11.
Parent taxa Fabaceae > subfam. Faboideae > Oxytropis > Oxytropis sericea
Sibling taxa
O. sericea var. speciosa
Synonyms Aragallus lambertii var. sericeus, A. sericeus, O. lambertii var. sericea, Spiesia lambertii var. sericea
Name authority unknown
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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