OregonFlora: Astragalus beckwithii vs. Astragalus filipes

	Astragalus beckwithii	Astragalus filipes
	Weiser's milkvetch	basalt milkvetch, threadstalk milkvetch
Habit		Plants perennial, caulescent, densely strigillose to glabrate, hairs basifixed.
Stems		several–numerous; erect or ascending; in large clumps, 20–90 cm.
Leaves		2.5–12 cm; leaflets (5)9–23, linear, filiform or narrowly elliptic or oblong, 3–25(30) × 0.5–5 mm; tips obtuse to truncate; retuse or subacute; surfaces strigose or glabrous; stipules 2–5 mm; at least lowermost connate-sheathing.
Inflorescences		racemes loosely 4–30-flowered; peduncles 4.5–22 cm; bracts 1–3.5 mm; pedicels 1.5–6 mm; bracteoles usually 0.
Flowers		spreading to declined at anthesis; calyces 4–7.7 mm, strigillose with black and white hairs; tubes 3.3–6.4 mm; teeth triangular, 0.5–1.5 mm; corollas 10–15 mm; whitish to ochroleucous; ovules 11–22.
Fruits		unilocular, pendulous, oblong to elliptic, strongly laterally compressed,
±		straight, bicarinate, 17–30(35) × 3–6.5 mm, glabrous to strigillose; valves papery; stipes 6–16 mm.
2n		=22, 24.

	Astragalus beckwithii	Astragalus filipes
Distribution	[WildflowerSearch map] [BONAP county map]	[WildflowerSearch map] [BONAP county map]
Discussion		Sagebrush, grasslands. Flowering May–Jul. 50–2400 m. BR, BW, Col, ECas, Lava, Owy, Sisk. CA, ID, NV, WA; north to British Columbia, southeast to UT, south Mexico. Native. This species is one of the most abundant and widely dispersed milkvetches in Oregon, often forming large colonies. It is usually easily recognizable by its connate stipules, numerous erect stems in clumps, yellowish flowers and pendulous, stipitate, laterally compressed, straight pods.
Source		Flora of Oregon, volume 2, page 664 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. 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 stenophyllus, Astragalus stenophyllus var. filipes, Astragalus stenophyllus var. stenophyllus
Web links	Local floras: BC, OR, WA Local Web sites: Flora NW, PNW Herbaria WildflowerSearch iNaturalist (observations) USDA Plants Database LBJ Wildflower Center SEINet Plants of the World Online Encyclopedia of Life Wikipedia Google Image Search	Local floras: BC, CA, OR, WA Local Web sites: CalFlora, CalPhotos, Flora NW, PNW Herbaria, Turner Photog. WildflowerSearch iNaturalist (observations) USDA Plants Database LBJ Wildflower Center SEINet Plants of the World Online Encyclopedia of Life Wikipedia Google Image Search

Astragalus filipes

Weiser's milkvetch

basalt milkvetch, threadstalk milkvetch

Habit

Plants perennial, caulescent, densely strigillose to glabrate, hairs basifixed.

Stems

several–numerous; erect or ascending; in large clumps, 20–90 cm.

Leaves

2.5–12 cm;

leaflets (5)9–23, linear, filiform or narrowly elliptic or oblong, 3–25(30) × 0.5–5 mm;

tips obtuse to truncate; retuse or subacute;

surfaces strigose or glabrous;

stipules 2–5 mm; at least lowermost connate-sheathing.

Inflorescences

racemes loosely 4–30-flowered;

peduncles 4.5–22 cm;

bracts 1–3.5 mm;

pedicels 1.5–6 mm;

bracteoles usually 0.

Flowers

spreading to declined at anthesis;

calyces 4–7.7 mm, strigillose with black and white hairs;

tubes 3.3–6.4 mm;

teeth triangular, 0.5–1.5 mm;

corollas 10–15 mm; whitish to ochroleucous;

ovules 11–22.

Fruits

unilocular, pendulous, oblong to elliptic, strongly laterally compressed,

straight, bicarinate, 17–30(35) × 3–6.5 mm, glabrous to strigillose;

valves papery;

stipes 6–16 mm.

=22, 24.

Astragalus filipes

Distribution

[WildflowerSearch map]

[BONAP county map]

[WildflowerSearch map]

[BONAP county map]

Discussion

Sagebrush, grasslands. Flowering May–Jul. 50–2400 m. BR, BW, Col, ECas, Lava, Owy, Sisk. CA, ID, NV, WA; north to British Columbia, southeast to UT, south Mexico. Native.

This species is one of the most abundant and widely dispersed milkvetches in Oregon, often forming large colonies. It is usually easily recognizable by its connate stipules, numerous erect stems in clumps, yellowish flowers and pendulous, stipitate, laterally compressed, straight pods.

Source

Flora of Oregon, volume 2, page 664
Richard Halse

Sibling taxa