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Astragalus beckwithii

Weiser's milkvetch

cobblestone milkvetch

Habit Plants perennial, caulescent, mat-forming, white tomentose, hairs basifixed.
Stems

several–numerous, prostrate; (2)5–25(30) cm.

Leaves

3–11 cm;

leaflets (7)11–17, broadly obovate; ovate-cuneate or broadly oblanceolate, 4–17 × 2.5–6.5 mm;

tips obtuse, emarginate or subacute;

surfaces abaxially white tomentose, adaxially tomentose, sometimes more thinly so and greenish;

stipules (1.5)3–7 mm; free.

Inflorescences

racemes subcapitate; (2)4–8-flowered;

peduncles 1–7 cm;

bracts (1.5)3–6 mm;

pedicels 1.4–3.4 mm;

bracteoles 0–2.

Flowers

ascending at anthesis;

calyces 12–17(19) mm, often purplish-tinged, thinly villosulous with mainly white hairs;

tubes 10–14 mm;

teeth subulate or subulate-setaceous; (2)3–5 mm;

corollas 19–25.5 mm, pink-purple;

ovules 30–41.

Fruits

unilocular, ascending, humistrate, obliquely-ovoid or oblong-ellipsoid, obcompressed; (15)20–40(45) × (8)9–13 mm, villous-hirsute;

hairs not concealing valve surfaces;

valves coriaceous;

stipes 0.

Astragalus beckwithii

Astragalus nudisiliquus

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

Rocky slopes, sandy riverbanks, cobblestone alluvia, eroded slopes with sagebrush. Flowering May–Jun. 600–1400 m. Owy. ID. Native.

Astragalus nudisiliquus may resemble A. purshii, but the latter’s valve surfaces are usually completely concealed by dense pubescence. In A. nudisiliquus, the valve surfaces are easily seen through the hairs.

Source Flora of Oregon, volume 2, page 670
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
A. accidens, A. agrestis, A. alpinus, A. alvordensis, A. applegatei, A. arthuri, A. atratus, A. australis, A. beckwithii, 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. 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
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