OregonFlora: Astragalus collinus vs. Astragalus vexilliflexus

	Astragalus collinus	Astragalus vexilliflexus
	hillside milkvetch
Habit	Plants perennial, caulescent, villosulous or strigose throughout, hairs basifixed.
Stems	several–numerous, decumbent to ascending or erect; in clumps, 15–50 cm.
Leaves	3–9(10.5) cm; leaflets (9)11–21(25), oblong-oblanceolate to linear-elliptic, 4–20(22) × 2–6 mm; tips truncate-retuse to obtuse; surfaces abaxially pubescent, adaxially pubescent, glabrescent, or glabrous; stipules 2–5(7) mm; free.
Inflorescences	racemes closely (10)15–40(55)-flowered; peduncles (4)5–16 cm; bracts 1.5–3.5 mm; pedicels 0.8–2.8 mm; bracteoles 2, rarely 0.
Flowers	nodding at anthesis; calyces gibbous-saccate at bases, 7–12.3 mm, villosulous with white or some black hairs; tubes 5.8–9.4 mm; teeth lanceolate to triangular, 0.8–2.7(3.5) mm; corollas (10.5)12–17.2 mm, white, cream, ochroleucous to lemon yellow; ovules 7–18.
Fruits	unilocular, pendulous, linear- or lance-oblong to lunate-oblong; straight or gently incurved, laterally compressed, bicarinate, 7–25 × 2.3–4.5 mm, villosulous or strigillose to glabrate; valves coriaceous; stipes (3.5)5–15 mm;
2n	=24.

	Astragalus collinus	Astragalus vexilliflexus
Distribution	[WildflowerSearch map] [BONAP county map]	[WildflowerSearch map] [BONAP county map]
Discussion	2 varieties.
Source	Flora of Oregon, volume 2, page 661 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. 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. 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. collinus var. collinus, A. collinus var. laurentii
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 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

Astragalus collinus

Astragalus vexilliflexus

hillside milkvetch

Habit

Plants perennial, caulescent, villosulous or strigose throughout, hairs basifixed.

Stems

several–numerous, decumbent to ascending or erect; in clumps, 15–50 cm.

Leaves

3–9(10.5) cm;

leaflets (9)11–21(25), oblong-oblanceolate to linear-elliptic, 4–20(22) × 2–6 mm;

tips truncate-retuse to obtuse;

surfaces abaxially pubescent, adaxially pubescent, glabrescent, or glabrous;

stipules 2–5(7) mm; free.

Inflorescences

racemes closely (10)15–40(55)-flowered;

peduncles (4)5–16 cm;

bracts 1.5–3.5 mm;

pedicels 0.8–2.8 mm;

bracteoles 2, rarely 0.

Flowers

nodding at anthesis;

calyces gibbous-saccate at bases, 7–12.3 mm, villosulous with white or some black hairs;

tubes 5.8–9.4 mm;

teeth lanceolate to triangular, 0.8–2.7(3.5) mm;

corollas (10.5)12–17.2 mm, white, cream, ochroleucous to lemon yellow;

ovules 7–18.

Fruits

unilocular, pendulous, linear- or lance-oblong to lunate-oblong; straight or gently incurved, laterally compressed, bicarinate, 7–25 × 2.3–4.5 mm, villosulous or strigillose to glabrate;

valves coriaceous;

stipes (3.5)5–15 mm;

=24.