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Astragalus beckwithii

Weiser's milkvetch

field milkvetch, purple milkvetch

Habit Plants perennial, caulescent, strigillose to villous-pilose, sometimes sparsely so, hairs basifixed.
Stems

few–numerous, decumbent to erect, 5–40 cm.

Leaves

2–10 cm;

leaflets (9)13–23, narrowly elliptic to lance-oblong, 4–18 × 2–5 mm;

tips obtuse to retuse or acute;

surfaces strigillose;

stipules 2–11 mm; at least lowermost connate-sheathing.

Inflorescences

racemes ovoid or subcapitate, 5–15(20)-flowered;

peduncles 1.5–15 cm;

bracts 3–7 mm;

pedicels 0.5–1.5 mm;

bracteoles 0.

Flowers

ascending to erect at anthesis;

calyces 7–12.5 mm, villous with black and white hairs;

tubes 5–7.8 mm;

teeth linear, 2.5–5.5 mm;

corollas (14)17–24 mm, pink, purple, or blue-lavender, or ochroleucous suffused with lilac;

ovules 14–26.

Fruits

bilocular, ascending to erect, oblong-elliptic, nearly straight, obcompressed to ± triquetrous, 7–10 × 2.8–4.5 mm; silky white-villous;

valves subcoriaceous;

stipes 0.3–1 mm.

Astragalus beckwithii

Astragalus agrestis

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

Wet meadows, streambanks. Flowering Jun–Aug. 1000–1900 m. BR, BW, Owy. CA, ID, NV, WA; north to Yukon, northeast to Quebec, east to IL, southeast to NM; Asia. Native.

Source Flora of Oregon, volume 2, page 657
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. 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. 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 dasyglottis, Astragalus goniatus
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