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Astragalus beckwithii

Weiser's milkvetch

Weiser's milkvetch

Habit Plants perennial, caulescent, glabrous to sparsely strigose, hairs basifixed when present.
Stems

several, prostrate to ascending, 10–35(70) cm.

Leaves

2–15 cm;

leaflets (7)11–17, broadly ovoid to rhombic-elliptic; (6)10–25 × 5–13 mm;

tips obtuse or sometimes mucronulate;

surfaces glabrous to glabrate;

stipules 3–10 mm; free.

Inflorescences

racemes loosely 7–16-flowered;

peduncles 3–15 cm;

bracts 3–7.5 mm;

pedicels 1–2.5 mm;

bracteoles usually 2.

Flowers

ascending at anthesis;

calyces (8.5)10.2–13.5 mm, nearly glabrous, sometimes with a few black hairs on teeth;

tubes (4.6)5.1–6.3 mm;

teeth lanceolate, 4.5–7 mm;

corollas 16–20.5 mm, ochroleucous;

ovules (18)25–41.

Fruits

unilocular, ascending to declined, oblong- or ovoid-ellipsoid, sharply incurved or bent; ± obcompressed and dorsally flattened or sulcate below the triangular beak, ventrally carinate, 15–30 × 6–12 mm, mottled, glabrous;

valves stiffly coriaceous to subligneous; gynophores 1.5–5 mm.

2n

=22.

Astragalus beckwithii

Astragalus beckwithii var. weiserensis

Distribution
[WildflowerSearch map]
[BONAP county map]
[BONAP county map]
Discussion

Sagebrush-bunchgrass communities, ash-clay outcrops, dry hillsides, road cuts. Flowering Apr–Jun. 500–1600 m. BR, BW, Lava, Owy. ID, NV, WA; north to British Columbia. Native.

Source Flora of Oregon, volume 2, page 658
Richard Halse
Sibling taxa
A. accidens, A. agrestis, A. alpinus, A. alvordensis, A. applegatei, A. arthuri, A. atratus, A. australis, A. californicus, A. calycosus, A. canadensis, A. caricinus, A. collinus, A. conjunctus, A. curvicarpus, A. cusickii, A. diaphanus, A. drummondii, A. eremiticus, A. filipes, A. gambellianus, A. geyeri, A. hoodianus, A. howellii, A. inflexus, A. iodanthus, A. kentrophyta, A. lemmonii, A. lentiginosus, A. malacus, A. misellus, A. mulfordiae, A. multiflorus, A. newberryi, A. nudisiliquus, A. obscurus, A. peckii, A. platytropis, A. purshii, A. reventus, A. robbinsii, A. salmonis, A. sclerocarpus, A. sheldonii, A. solitarius, A. spaldingii, A. sterilis, A. succumbens, A. tegetarioides, A. tetrapterus, A. toanus, A. tweedyi, A. tyghensis, A. umbraticus, A. vallaris, A. whitneyi
Subordinate taxa
A. beckwithii var. weiserensis
Synonyms Astragalus weiserensis
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