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hare oxytrope, haresfoot locoweed

kobuk locoweed

Habit Plants cespitose, appearing acaulescent, herbage silky-pilose. Plants cespitose, clump-forming, appearing acaulescent; caudex branches elongate.
Leaves

1–10 cm;

stipules membranous, soon ruptured, light becoming dark in age, silky-pilose, margins ciliate;

leaflets 5–17, scattered or congested, blades ovate-oblong to narrowly elliptic, 3–15 × 2–6 mm, apex acute or obtuse, surfaces pilose or sericeous.

6–10 cm;

stipules persistent, well separated, firm, rigid, usually purplish or becoming purplish, free ends long-attenuate, pilose abaxially, or glabrate on free ends, margins scarious and ciliate, with clavate processes;

leaflets 13–17, blades lanceolate to lanceolate-oblong, 6–16(–18) × 2–3.5 mm, base rounded, margins involute, apex obtuse to acute, surfaces strigose to pilose abaxially, pilose to glabrate adaxially.

Racemes

(3–)5–18-flowered, subcapitate or slightly elongate.

5–8-flowered.

Peduncles

1–13 cm, axis 0.5–3(–4) cm in fruit, appressed-pilose to villous-hirsute;

bract ovate-lanceolate to lanceolate, margins involute, shaggy-pilose.

7–11 cm, strigose, hairs spreading, appressed;

bract lanceolate, pilose, margins ciliate, with clavate processes.

Corollas

bright pink-purple or bluish purple, 15–19(–20) mm.

blue or purplish, 16–18(–20) mm.

Calyces

deeply campanulate, villous to shaggy-villous, hairs mixed blackish and white, appearing gray, 2 mm;

tube 5.5–7 mm, slightly swollen to strongly inflated, variably accrescent, ruptured by fruit or not, lobes 2–4.5 mm.

purplish, short-cylindric to campanulate, minutely strigulose, hairs black and white;

tube 5.8–7 mm, lobes 1.5–2.2 mm.

Legumes

enclosed in or exserted from calyx, erect, sessile or short-stipitate, ovoid to narrowly oblong, turgid to inflated, 6–15(–20) × 4–6.5 mm, bilocular, papery to nearly membranous, white- or black-villous.

held aloft at maturity, spreading, sessile, cylindric, 12–17 × 5–7 mm (to 3 times longer than wide), bilocular or sub-bilocular, pilose, hairs black or black and white.

2n

= 80.

Oxytropis lagopus

Oxytropis kobukensis

Phenology Flowering summer.
Habitat Sand dunes.
Elevation 0–100 m. (0–300 ft.)
Distribution
from USDA
w North America
[WildflowerSearch map]
[BONAP county map]
from FNA
AK
[BONAP county map]
Discussion

Varieties 3 (3 in the flora).

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Oxytropis kobukensis is restricted to the Kobuk River area in western Alaska.

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Key
1. Leaflets 7 or 9(–13), congested on rachis, rachis about equaling longest leaflet; sw Alberta, w Montana.
var. conjugans
1. Leaflets 11–17, well-distributed on rachis, rachis longer than longest leaflet; Idaho, Montana, South Dakota, Wyoming.
→ 2
2. Calyces becoming swollen, accrescent in fruit; legumes falling enclosed within calyx prior to dehiscence; Idaho, Montana, n Wyoming.
var. lagopus
2. Calyces slightly swollen or not accrescent in fruit; legumes usually persisting on plant within calyx until after dehiscence; s Montana, South Dakota, Wyoming.
var. atropurpurea
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. lambertii, O. maydelliana, O. mertensiana, O. multiceps, 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. 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. sericea, O. splendens
Subordinate taxa
O. lagopus var. atropurpurea, O. lagopus var. conjugans, O. lagopus var. lagopus
Name authority Nuttall: J. Acad. Nat. Sci. Philadelphia 7: 17. (1834) S. L. Welsh: Iowa State J. Sci. 41: 286. (1967)
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