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flowery pointloco, Nuttall's oxytrope, Rocky Mountain oxytrope

silky locoweed, white locoweed, whitepoint crazyweed

Habit Plants pulvinate-cespitose, appearing acaulescent, herbage silky-pilose. Plants cespitose, appearing acaulescent, 7–45 cm, herbage sparsely to densely silky-pilose, usually canescent.
Leaves

1–5 cm;

stipules membranous, light tan or pale gray, white-silky-pilose, margins ciliate;

leaflets 5–9, opposite or scattered, blades lanceolate to elliptic, oblong, or oblanceolate, 3–13 × 1–4 mm, apex acute, surfaces silky-pilose.

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.

Racemes

1–4-flowered, clustered.

5–20+-flowered, subcapitate to elongate.

Peduncles

1–4 cm, axis 0.5–1 cm in fruit, long-villous;

bract ovate to broadly lanceolate, sparsely pilose.

erect, 7–30 cm, sericeous;

bract lanceolate, shorter than flowers, pilose.

Corollas

bright pink to pink-purple, 17–24 mm.

white to yellowish, keel tip maculate or not, 17–27(–28) mm.

Calyces

campanulate or already tumescent at anthesis, 7–13(–20) mm, densely white-pilose;

tube 5.5–10 mm 8–18 mm in fruit, becoming bladdery-inflated and investing fruit, lobes 2–3 mm.

cylindric, 7–12 mm, pilose, hairs black and white, lobes dark hairy;

tube 6.5–9 mm, lobes 2–4 mm.

Legumes

included within swollen calyx, erect or pendulous, stipitate, stipe 0.5–1.5 mm, ovoid-ellipsoid, 6–10 × 3–5 mm, subunilocular, papery, not rigid at maturity, short-villous.

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.

Oxytropis multiceps

Oxytropis sericea

Phenology Flowering spring–early summer.
Habitat Gravelly summits and ridges, conifer and alpine communities.
Elevation 1300–3200 m. (4300–10500 ft.)
Distribution
from FNA
CO; NE; UT; WY
[WildflowerSearch map]
[BONAP county map]
from USDA
nw North America; c North America
[WildflowerSearch map]
[BONAP county map]
Discussion

The dwarf habit, accrescent calyces, broad bracts, and relatively few flowers are characteristic of Oxytropis multiceps.

(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.)

Key
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
Source FNA vol. 11. FNA vol. 11.
Parent taxa Fabaceae > subfam. Faboideae > Oxytropis Fabaceae > subfam. Faboideae > Oxytropis
Sibling taxa
O. arctica, O. besseyi, O. borealis, O. campestris, O. deflexa, O. huddelsonii, O. kobukensis, O. kokrinensis, O. lagopus, O. lambertii, O. maydelliana, O. mertensiana, O. nana, O. nigrescens, O. oreophila, O. parryi, O. podocarpa, O. riparia, O. scammaniana, O. sericea, O. splendens
O. arctica, O. besseyi, O. borealis, O. campestris, O. deflexa, O. huddelsonii, O. kobukensis, O. kokrinensis, O. lagopus, O. lambertii, O. maydelliana, O. mertensiana, O. multiceps, O. nana, O. nigrescens, O. oreophila, O. parryi, O. podocarpa, O. riparia, O. scammaniana, O. splendens
Subordinate taxa
O. sericea var. sericea, O. sericea var. speciosa
Synonyms Aragallus multiceps, O. multiceps var. minor, Spiesia multiceps
Name authority Nuttall in J. Torrey and A. Gray: Fl. N. Amer. 1: 341. (1838) Nuttall in J. Torrey and A. Gray: Fl. N. Amer. 1: 339. (1838)
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