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hare oxytrope, haresfoot locoweed

Photo is of parent taxon

haresfoot locoweed

Habit Plants cespitose, appearing acaulescent, herbage silky-pilose. Plants 4–15 cm.
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.

1.5–10 cm, rachis longer than longest leaflet;

leaflets 11–17, well distributed on rachis, blade surfaces long-pilose.

Racemes

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

(3–)5–15-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.

usually villous, sometimes appressed-pilose.

Corollas

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

15–19 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.

slightly swollen or not accrescent in fruit, ruptured by (but closely investing) base of exserted pod.

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.

usually persisting on plant within calyx until after dehiscence, swollen to inflated, oblong or ovoid, 8–15 × 4.5–6.5 mm.

Oxytropis lagopus

Oxytropis lagopus var. atropurpurea

Phenology Flowering spring–early summer.
Habitat Gravelly plains, ridges, slopes.
Elevation 1000–3200 m. (3300–10500 ft.)
Distribution
from USDA
w North America
[WildflowerSearch map]
[BONAP county map]
from FNA
MT; SD; WY
[BONAP county map]
Discussion

Varieties 3 (3 in the flora).

(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 > Oxytropis lagopus
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. lagopus var. conjugans, O. lagopus var. lagopus
Subordinate taxa
O. lagopus var. atropurpurea, O. lagopus var. conjugans, O. lagopus var. lagopus
Synonyms Aragallus atropurpureus
Name authority Nuttall: J. Acad. Nat. Sci. Philadelphia 7: 17. (1834) (Rydberg) Barneby: Leafl. W. Bot. 6: 111. (1951)
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