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jessie's kentrophyta, spiny milkvetch

Habit Plants spreading or prostrate, loosely mat-forming, 5–35 cm wide.
Stems

and herbage strigulose, hairs malpighian.

Leaves

1–1.7 cm;

stipules dimorphic, those at proximal nodes connate into short, bidentate sheath, those at distal nodes longer, connate at base only, lanceolate or lanceolate-acuminate, often without spines, 1.5–7(–8) mm;

leaflets 5, blades 4–10 mm, surfaces pubescent.

Peduncles

0.1–0.6 cm.

Flowers

5.2–6.5 mm;

calyx 3.6–5.1 mm, tube 1.6–2.5 mm, lobes subulate, spinulose, 1.9–3 mm;

corolla whitish, banner and keel tips sometimes faintly tinged pink or lilac.

Legumes

lenticular or ovoid-lenticular, 3–4.5 × 1.4–2 mm.

Seeds

2(or 3).

2n

= 24.

Astragalus kentrophyta var. jessiae

Phenology Flowering Jun–Aug.
Habitat Bluffs, ridges, dunes, sandy sites.
Elevation 700–2400 m. (2300–7900 ft.)
Distribution
from FNA
ID; OR; UT; WY
[BONAP county map]
Discussion

The distribution of var. jessiae is bicentric: southwestern Idaho and southeastern Oregon, and northeastern Utah and southwestern Wyoming.

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

Source FNA vol. 11.
Parent taxa Fabaceae > subfam. Faboideae > Astragalus > sect. Ervoidei > Astragalus kentrophyta
Sibling taxa
A. kentrophyta var. coloradoensis, A. kentrophyta var. danaus, A. kentrophyta var. douglasii, A. kentrophyta var. elatus, A. kentrophyta var. kentrophyta, A. kentrophyta var. neomexicanus, A. kentrophyta var. tegetarius, A. kentrophyta var. ungulatus
Synonyms A. jessiae
Name authority (M. Peck) Barneby: Leafl. W. Bot. 6: 154. (1951)
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