OregonFlora: Astragalus succumbens vs. Astragalus speirocarpus

	Astragalus succumbens	Astragalus curvicarpus var. curvicarpus (synonym of Astragalus speirocarpus)
	Columbia milkvetch, crouching milkvetch	curvepod milkvetch, sickle milkvetch
Habit	Plants perennial, caulescent, densely to thinly grayish hirsute, hairs basifixed.
Stems	several, decumbent to erect, 2–40(50) cm.
Leaves	3–10(11) cm; leaflets (7)9–19, oblong to oblong-ovate, obovate to elliptic, 5–19 × 3–9 mm; tips acute to obtuse or retuse; surfaces abaxially hirsute, adaxially hirsute to glabrescent; stipules (1.5)2.5–8(9) mm; free.
Leaflets		pubescent.
Inflorescences	racemes densely 10–25-flowered; peduncles 1.5–5.5 cm; bracts (2.5)4–12 mm; pedicels 0.5–2.3 mm; bracteoles 0–2.
Flowers	spreading-ascending at anthesis; calyces 9.5–13(15) mm; hirsute to hirsutulous with all white or white with some black hairs; tubes 7–8.6 mm; teeth subulate to linear-lanceolate, 2.5–5.5 mm; corollas 14–20(23) mm, bicolored; banners pink to white; wings white; keels pink to purple; tips spotted; ovules 27–38.	calyces (7.9)9.1–11.2 mm; tubes (6.9)7.5–9.4 mm; teeth (0.5)1–2.3 mm; corollas (15)16.4–21 mm; keels (11)11.7–15.2 mm; ovaries pubescent.
Fruits	bilocular, ascending, lunately linear-lanceolate or -oblong, arcuate to straight, triquetrous, strongly compressed, deeply sulcate dorsally; (20)25–40 × 4–8 mm, glabrous; valves cartilaginous; stipes 0.	villosulous or strigillose, rarely glabrate or glabrous; stipes (9)11–20 mm.
2n	=24.

	Astragalus succumbens	Astragalus curvicarpus var. curvicarpus
Distribution	[WildflowerSearch map] [BONAP county map]	[WildflowerSearch map] [BONAP county map]
Discussion	Sandy hills and dunes, roadbanks, sagebrush. Flowering Apr–Jul. 50–900 m. Col. WA. Native.	Sagebrush flats, juniper woodlands, roadsides, slopes. Flowering May–Aug. 800–2000 m. BR, BW, ECas, Lava, Owy. CA, ID, NV. Native.
Source	Flora of Oregon, volume 2, page 674 Richard Halse	Flora of Oregon, volume 2, page 662 Richard Halse
Sibling taxa	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. 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. tegetarioides, A. tetrapterus, A. toanus, A. tweedyi, A. tyghensis, A. umbraticus, A. vallaris, A. whitneyi	A. curvicarpus var. brachycodon, A. curvicarpus var. curvicarpus, A. curvicarpus var. subglaber
Synonyms		Astragalus gibbsii, Astragalus speirocarpus, Astragalus whitedii, Astragalus whitedii var. whitedii
Web links	Local floras: OR, WA Local Web sites: 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	Local floras: OR, WA Local Web sites: 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 succumbens

Astragalus curvicarpus var. curvicarpus

(synonym of Astragalus speirocarpus)

Columbia milkvetch, crouching milkvetch

curvepod milkvetch, sickle milkvetch

Habit

Plants perennial, caulescent, densely to thinly grayish hirsute, hairs basifixed.

Stems

several, decumbent to erect, 2–40(50) cm.

Leaves

3–10(11) cm;

leaflets (7)9–19, oblong to oblong-ovate, obovate to elliptic, 5–19 × 3–9 mm;

tips acute to obtuse or retuse;

surfaces abaxially hirsute, adaxially hirsute to glabrescent;

stipules (1.5)2.5–8(9) mm; free.

Leaflets

pubescent.

Inflorescences

racemes densely 10–25-flowered;

peduncles 1.5–5.5 cm;

bracts (2.5)4–12 mm;

pedicels 0.5–2.3 mm;

bracteoles 0–2.

Flowers

spreading-ascending at anthesis;

calyces 9.5–13(15) mm; hirsute to hirsutulous with all white or white with some black hairs;

tubes 7–8.6 mm;

teeth subulate to linear-lanceolate, 2.5–5.5 mm;

corollas 14–20(23) mm, bicolored;

banners pink to white;

wings white;

keels pink to purple;

tips spotted;

ovules 27–38.

calyces (7.9)9.1–11.2 mm;

tubes (6.9)7.5–9.4 mm;

teeth (0.5)1–2.3 mm;

corollas (15)16.4–21 mm;

keels (11)11.7–15.2 mm;

ovaries pubescent.

Fruits

bilocular, ascending, lunately linear-lanceolate or -oblong, arcuate to straight, triquetrous, strongly compressed, deeply sulcate dorsally; (20)25–40 × 4–8 mm, glabrous;

valves cartilaginous;

stipes 0.

villosulous or strigillose, rarely glabrate or glabrous;

stipes (9)11–20 mm.

=24.