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Robbins' milk-vetch
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bent milkvetch, flexible milk-vetch, flexile milk-vetch, pliant milk-vetch
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| Plants clump-forming, slender to robust, 7–45(–60) cm, strigulose to pilose-villosulous; from superficial or somewhat subterranean caudex. |
Plants slender, 10–60 cm, strigulose to villosulous, canescent, or cinereous; from branched, subterranean caudex. |
usually ascending, rarely decumbent, 0–2 cm underground, strigulose to pilose-villosulous. |
decumbent or ascending, 15–60(–70) cm, 1–20+ cm underground, silky-canescent, hairs appressed, incurved-ascending or curly. |
2.5–12 cm; stipules 1.5–6 mm, papery at proximal nodes, herbaceous or submembranous at distal nodes; leaflets (5 or)7–17, blades lanceolate to oblong, (3–)5–30(–32) mm, apex obtuse or emarginate, surfaces usually strigulose, sometimes villous-pilosulous, cinereous, glabrate, or glabrous abaxially, glabrous, glabrescent, or sparsely strigose adaxially. |
1.5–9 cm; stipules connate-sheathing and papery at proximal nodes, connate or distinct and herbaceous at distal nodes, 1–7 mm; leaflets (7 or)9–25(–29), blades linear, linear-oblong, oblong-oblanceolate, or obovate-cuneate, (2–)3–19 mm, apex obtuse to truncate or retuse, surfaces strigose to glabrate abaxially, usually glabrous adaxially. |
(3–)5–25(–33)-flowered; axis 1–18(–20) cm in fruit, elongating little after flowering, arising distal to middle of stem; bracts 1–3.5 mm; bracteoles usually 0. |
(7–)10–26(–30)-flowered, flowers spreading; axis (1–)2.5–13(–15) cm in fruit, elongating after flowering; bracts 0.6–4.5 mm; bracteoles 0–2. |
incurved-ascending or erect, 3.5–21(–23) cm, usually surpassing subtending leaf, together with racemes usually shorter than stems. |
incurved-ascending, divaricate, or erect, 1.5–19 cm, together with racemes usually shorter than stems. |
0.5–3 mm. |
0.7–3.5 mm. |
(6–)7.2–11.5 mm; calyx 4–6.8 mm, strigulose, tube 3.2–4.5 mm, lobes subulate, 0.7–2.3 mm; corolla usually purple, pink-purple, pink, lilac, lavender, or whitish, sometimes whitish with maculate keel; wing apex obtuse; keel 5.4–7.9 mm, shorter than wings. |
7–11 mm; calyx campanulate, 3.3–6 mm, strigose, tube 1.9–4.3 mm, lobes subulate, 0.5–2 mm; corolla pink-purple to dull purplish; keel 5–8.2 mm. |
pendulous, green or purplish, straight or slightly decurved, ellipsoid, obtusely 3-sided, faces slightly convex, flattened or depressed but not sulcate abaxially, 13–25 × 3.5–5.5 mm, subunilocular or semibilocular, papery-membranous, sparsely strigulose, hairs black or black and white; valves inflexed as hyaline septum 0.2–2 mm wide; stipe (0.5–)1.5–6.5 mm. |
descending to spreading, green or mottled becoming stramineous or brownish, straight or slightly incurved, linear-oblong, linear-oblanceoloid, oblong-ellipsoid, lanceoloid-ellipsoid, or ovoid-ellipsoid, subterete or ± flattened, (8–)11–24 × 2.7–9 mm, thinly to stiffly papery, usually strigulose or villosulous, rarely glabrous; stipe 0–1.3 mm. |
6–11. |
12–25. |
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North America
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North America
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Varieties 8 (8 in the flora). Astragalus robbinsii consists of a series of infraspecific taxa with two centers of dispersal in North America: Colorado to Alaska, and New England into eastern Canada. The distribution of three closely allied subordinate taxa within Vermont and New Hampshire is unmatched in the genus in North America. D. Isely (1998) questioned the taxonomic significance of the traditional varieties as recognized herein. The species is often confused in herbaria with A. alpinus, which has a keel longer than or as long as and wider than the wings (in A. robbinsii the keel is shorter than and little or no wider than the wings). (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Varieties 3 (3 in the flora). D. Isely (1998) summarized the problems surrounding the epithet for Astragalus flexuosus, but it was retained by him, as it is herein, for nomenclatural consistency. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
1. Leaflet blade surfaces abaxially densely gray or white villous-pilosulous, hairs 0.6–0.8 mm; legume stipes 1.2–3 mm, septae 1.2–2 mm wide; s coastal Alaska. | var. harringtonii |
1. Leaflet blade surfaces abaxially sparsely strigulose, cinereous, glabrous, or glabrate, hairs 0.2–0.6(–0.7) mm; legume stipes (0.5–)1.5–5(–6.5) mm, septae 0.2–1(–1.5) mm wide; not in s coastal Alaska. | → 2 |
2. Legume stipes (1–)1.5–5(–6.5) mm; Alaska, New England, Nova Scotia, n Rocky Mountains. | → 3 |
3. Stems 7–10 cm; racemes 5–11-flowered, axes 1–1.5 cm in fruit (barely elongated); legume stipes 5 mm; seeds 5 or 6; Mt. Roberts, near Juneau, Alaska. | var. morganiae |
3. Stems 10–40(–60) cm; racemes (5–)7–21-flowered, axes (1–)3–18(–20) cm in fruit; legume stipes (1–)1.5–5(–6.5) mm; seeds (6 or)7–11. | → 4 |
4. Legumes 10–15 mm, sparsely strigulose, beaks to 1 mm; corollas whitish; Vermont historically. | var. robbinsii |
4. Legumes (10–)13–25 mm, sparsely or densely pubescent, beaks 0.8–3 mm; corollas pale purple, pink-purple, pink, or whitish and keel tip purple; widespread, including Vermont. | → 5 |
5. Legumes sparsely strigose-pilosulous, beaks 0.8–1.5 mm; leaflet blade surfaces uniformly strigulose abaxially, or glabrate throughout; Alaska, Canada, w United States, Maine and Vermont. | var. minor |
5. Legumes sparsely strigulose, beaks 1.5–3 mm; leaflet blade surfaces cinereous abaxially, pubescent adaxially (margins sparsely pubescent); local along Connecticut River in Vermont and New Hampshire. | var. jesupii |
2. Legume stipes 0.5–3(–6.5) mm; coastal Labrador, adjoining Newfoundland, e Quebec to Alberta, northward to Northwest Territories, southward to New Mexico, including Maine and Vermont. | → 6 |
6. Seeds 3–6; legumes 8–13 mm; Wallowa Mountains, ne Oregon. | var. alpiniformis |
6. Seeds (6 or)7–10; legumes (8–)10–25 mm; not Oregon. | → 7 |
7. Raceme axis 1.2–6(–8) cm in fruit; leaflet blade surfaces sparsely pubescent along margins adaxially or strigulose throughout; s Labrador, adjoining Newfoundland, Quebec. | var. fernaldii |
7. Raceme axis (2–)3–18(–20) cm in fruit; leaflet blade surfaces glabrous or glabrate adaxially; not s Labrador, adjoining Newfoundland, and Quebec. | → 8 |
8. Legumes (10–)13–25 mm, stipes (1–)1.5–5(–6.5) mm; racemes (5–)7–25(–33)-flowered, axes (2–)3–18(–20) cm in fruit; proximal stipules distinct or obscurely connate; not ne Nevada. | var. minor |
8. Legumes (8–)10–15(–18) mm, stipes 0.5–1.4 mm; racemes remotely (3–)6–12-flowered, axes (2–)6–15 mm in fruit; proximal stipules connate 1/2 their length; East Humboldt and Ruby mountains, ne Nevada. | var. occidentalis |
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1. Calyces 3.3–4.1 mm; banners abruptly recurved through 90°; keel 5–5.5 mm, semiorbiculate, very strongly incurved through 120°; legumes 11–15(–20) × 3–4(–4.5) mm; elevation 1300–2100 m. | var. diehlii |
1. Calyces 3.5–6 mm; banners recurved through 45–50°; keel 5.3–8.2 mm, semiobovate, incurved through 90–100°; legumes (8–)12–24 × 2.7–9 mm; elevation 200–2900 m. | → 2 |
2. Legume stipes 0.5–1.3 mm, body scarcely turgid, 2.7–4.8 mm wide, base usually cuneate-tapered. | var. flexuosus |
2. Legume stipes 0–0.5 mm, body turgid or inflated, (4–)5–9 mm wide, base rounded (when less than 5 mm wide). | var. greenei |
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| FNA vol. 11. |
FNA vol. 11. |
| Fabaceae > subfam. Faboideae > Astragalus > sect. Oroboidei |
Fabaceae > subfam. Faboideae > Astragalus > sect. Scytocarpi |
A. accidens, A. accumbens, A. ackermanii, A. acutirostris, A. adanus, A. aequalis, A. agnicidus, A. agrestis, A. albens, A. albulus, A. allochrous, A. alpinus, A. altus, A. alvordensis, A. amblytropis, A. americanus, A. amnis-amissi, A. amphioxys, A. ampullarioides, A. ampullarius, A. andersonii, A. anisus, A. anserinus, A. applegatei, A. aquilonius, A. aretioides, A. argophyllus, A. aridus, A. arizonicus, A. arrectus, A. arthurii, A. asclepiadoides, A. asotinensis, A. asymmetricus, A. atratus, A. atropubescens, A. atwoodii, A. austiniae, A. australis, A. barnebyi, A. barrii, A. beathii, A. beatleyae, A. beckwithii, A. bernardinus, A. bibullatus, A. bicristatus, A. bisulcatus, A. bodinii, A. bolanderi, A. bourgovii, A. brandegeei, A. brauntonii, A. brazoensis, A. breweri, A. californicus, A. callithrix, A. calycosus, A. camptopus, A. canadensis, A. caricinus, A. casei, A. castaneiformis, A. castetteri, A. ceramicus, A. cerussatus, A. chamaeleuce, A. chamaemeniscus, A. chinensis, A. chloödes, A. chuskanus, A. cibarius, A. cicer, A. cimae, A. claranus, A. clevelandii, A. cliffordii, A. cobrensis, A. coccineus, A. collinus, A. coltonii, A. columbianus, A. concordius, A. congdonii, A. conjunctus, A. consobrinus, A. contortuplicatus, A. convallarius, A. cottamii, A. crassicarpus, A. cremnophylax, A. cronquistii, A. crotalariae, A. curtipes, A. curvicarpus, A. cusickii, A. cutleri, A. cyaneus, A. cymboides, A. deanei, A. debequaeus, A. desereticus, A. desperatus, A. deterior, A. detritalis, A. diaphanus, A. didymocarpus, A. distortus, A. diversifolius, A. douglasii, A. drabelliformis, A. drummondii, A. duchesnensis, A. eastwoodiae, A. egglestonii, A. emoryanus, A. endopterus, A. ensiformis, A. episcopus, A. equisolensis, A. eremiticus, A. ertterae, A. eucosmus, A. eurekensis, A. eurylobus, A. falcatus, A. feensis, A. filipes, A. flavus, A. flexuosus, A. fucatus, A. funereus, A. gambelianus, A. geyeri, A. gibbsii, A. giganteus, A. gilensis, A. gilmanii, A. gilviflorus, A. glycyphyllos, A. gracilis, A. grayi, A. gypsodes, A. hallii, A. hamiltonii, A. harrisonii, A. heilii, A. henrimontanensis, A. holmgreniorum, A. hoodianus, A. hornii, A. howellii, A. humillimus, A. humistratus, A. hyalinus, A. hypoxylus, A. inflexus, A. insularis, A. inversus, A. inyoensis, A. iodanthus, A. iodopetalus, A. iselyi, A. jaegerianus, A. jejunus, A. johannis-howellii, A. kelseyae, A. kentrophyta, A. kerrii, A. knightii, A. laccoliticus, A. lancearius, A. laxmannii, A. layneae, A. leibergii, A. lemmonii, A. lentiformis, A. lentiginosus, A. leptaleus, A. leptocarpus, A. leucolobus, A. limnocharis, A. lindheimeri, A. linifolius, A. loanus, A. lonchocarpus, A. lotiflorus, A. lutosus, A. lyallii, A. macrodon, A. magdalenae, A. malacoides, A. malacus, A. megacarpus, A. michauxii, A. microcymbus, A. microcystis, A. microlobium, A. micromerius, A. miguelensis, A. minthorniae, A. misellus, A. miser, A. missouriensis, A. moencoppensis, A. mohavensis, A. mollissimus, A. molybdenus, A. monoensis, A. montii, A. monumentalis, A. mulfordiae, A. multiflorus, A. musiniensis, A. naturitensis, A. neglectus, A. nelsonianus, A. neomexicanus, A. nevinii, A. newberryi, A. nidularius, A. nothoxys, A. nudisiliquus, A. nutans, A. nutriosensis, A. nuttallianus, A. nuttallii, A. nutzotinensis, A. nyensis, A. obcordatus, A. obscurus, A. oniciformis, A. oocalycis, A. oocarpus, A. oophorus, A. oreganus, A. osterhoutii, A. oxyphysus, A. pachypus, A. palmeri, A. panamintensis, A. pardalinus, A. parryi, A. pattersonii, A. pauperculus, A. paysonii, A. peckii, A. pectinatus, A. perianus, A. phoenix, A. pictiformis, A. pinonis, A. piscator, A. piutensis, A. plattensis, A. platytropis, A. polaris, A. pomonensis, A. porrectus, A. praelongus, A. preussii, A. proimanthus, A. proximus, A. pseudiodanthus, A. pterocarpus, A. pubentissimus, A. pulsiferae, A. puniceus, A. purshii, A. pycnostachyus, A. racemosus, A. rafaelensis, A. rattanii, A. ravenii, A. recurvus, A. reflexus, A. remotus, A. reventiformis, A. reventus, A. riparius, A. ripleyi, A. rusbyi, A. sabulonum, A. sabulosus, A. salmonis, A. saurinus, A. scaphoides, A. schmolliae, A. sclerocarpus, A. scopulorum, A. sepultipes, A. serenoi, A. sericoleucus, A. serpens, A. sesquiflorus, A. sheldonii, A. shevockii, A. shortianus, A. siliceus, A. simplicifolius, A. sinuatus, A. solitarius, A. sophoroides, A. soxmaniorum, A. spaldingii, A. sparsiflorus, A. spatulatus, A. speirocarpus, A. straturensis, A. striatiflorus, A. subcinereus, A. subvestitus, A. succumbens, A. tegetarioides, A. tener, A. tennesseensis, A. tephrodes, A. terminalis, A. tetrapterus, A. thurberi, A. tibetanus, A. tidestromii, A. tiehmii, A. titanophilus, A. toanus, A. toquimanus, A. tortipes, A. traskiae, A. tricarinatus, A. trichopodus, A. tridactylicus, A. troglodytus, A. tweedyi, A. tyghensis, A. umbellatus, A. umbraticus, A. uncialis, A. utahensis, A. vaccarum, A. vallaris, A. vexilliflexus, A. villosus, A. wardii, A. waterfallii, A. webberi, A. welshii, A. wetherillii, A. whitneyi, A. williamsii, A. wingatanus, A. wittmannii, A. woodruffii, A. wootonii, A. wrightii, A. xiphoides, A. yoderwilliamsii, A. zionis |
A. accidens, A. accumbens, A. ackermanii, A. acutirostris, A. adanus, A. aequalis, A. agnicidus, A. agrestis, A. albens, A. albulus, A. allochrous, A. alpinus, A. altus, A. alvordensis, A. amblytropis, A. americanus, A. amnis-amissi, A. amphioxys, A. ampullarioides, A. ampullarius, A. andersonii, A. anisus, A. anserinus, A. applegatei, A. aquilonius, A. aretioides, A. argophyllus, A. aridus, A. arizonicus, A. arrectus, A. arthurii, A. asclepiadoides, A. asotinensis, A. asymmetricus, A. atratus, A. atropubescens, A. atwoodii, A. austiniae, A. australis, A. barnebyi, A. barrii, A. beathii, A. beatleyae, A. beckwithii, A. bernardinus, A. bibullatus, A. bicristatus, A. bisulcatus, A. bodinii, A. bolanderi, A. bourgovii, A. brandegeei, A. brauntonii, A. brazoensis, A. breweri, A. californicus, A. callithrix, A. calycosus, A. camptopus, A. canadensis, A. caricinus, A. casei, A. castaneiformis, A. castetteri, A. ceramicus, A. cerussatus, A. chamaeleuce, A. chamaemeniscus, A. chinensis, A. chloödes, A. chuskanus, A. cibarius, A. cicer, A. cimae, A. claranus, A. clevelandii, A. cliffordii, A. cobrensis, A. coccineus, A. collinus, A. coltonii, A. columbianus, A. concordius, A. congdonii, A. conjunctus, A. consobrinus, A. contortuplicatus, A. convallarius, A. cottamii, A. crassicarpus, A. cremnophylax, A. cronquistii, A. crotalariae, A. curtipes, A. curvicarpus, A. cusickii, A. cutleri, A. cyaneus, A. cymboides, A. deanei, A. debequaeus, A. desereticus, A. desperatus, A. deterior, A. detritalis, A. diaphanus, A. didymocarpus, A. distortus, A. diversifolius, A. douglasii, A. drabelliformis, A. drummondii, A. duchesnensis, A. eastwoodiae, A. egglestonii, A. emoryanus, A. endopterus, A. ensiformis, A. episcopus, A. equisolensis, A. eremiticus, A. ertterae, A. eucosmus, A. eurekensis, A. eurylobus, A. falcatus, A. feensis, A. filipes, A. flavus, A. fucatus, A. funereus, A. gambelianus, A. geyeri, A. gibbsii, A. giganteus, A. gilensis, A. gilmanii, A. gilviflorus, A. glycyphyllos, A. gracilis, A. grayi, A. gypsodes, A. hallii, A. hamiltonii, A. harrisonii, A. heilii, A. henrimontanensis, A. holmgreniorum, A. hoodianus, A. hornii, A. howellii, A. humillimus, A. humistratus, A. hyalinus, A. hypoxylus, A. inflexus, A. insularis, A. inversus, A. inyoensis, A. iodanthus, A. iodopetalus, A. iselyi, A. jaegerianus, A. jejunus, A. johannis-howellii, A. kelseyae, A. kentrophyta, A. kerrii, A. knightii, A. laccoliticus, A. lancearius, A. laxmannii, A. layneae, A. leibergii, A. lemmonii, A. lentiformis, A. lentiginosus, A. leptaleus, A. leptocarpus, A. leucolobus, A. limnocharis, A. lindheimeri, A. linifolius, A. loanus, A. lonchocarpus, A. lotiflorus, A. lutosus, A. lyallii, A. macrodon, A. magdalenae, A. malacoides, A. malacus, A. megacarpus, A. michauxii, A. microcymbus, A. microcystis, A. microlobium, A. micromerius, A. miguelensis, A. minthorniae, A. misellus, A. miser, A. missouriensis, A. moencoppensis, A. mohavensis, A. mollissimus, A. molybdenus, A. monoensis, A. montii, A. monumentalis, A. mulfordiae, A. multiflorus, A. musiniensis, A. naturitensis, A. neglectus, A. nelsonianus, A. neomexicanus, A. nevinii, A. newberryi, A. nidularius, A. nothoxys, A. nudisiliquus, A. nutans, A. nutriosensis, A. nuttallianus, A. nuttallii, A. nutzotinensis, A. nyensis, A. obcordatus, A. obscurus, A. oniciformis, A. oocalycis, A. oocarpus, A. oophorus, A. oreganus, A. osterhoutii, A. oxyphysus, A. pachypus, A. palmeri, A. panamintensis, A. pardalinus, A. parryi, A. pattersonii, A. pauperculus, A. paysonii, A. peckii, A. pectinatus, A. perianus, A. phoenix, A. pictiformis, A. pinonis, A. piscator, A. piutensis, A. plattensis, A. platytropis, A. polaris, A. pomonensis, A. porrectus, A. praelongus, A. preussii, A. proimanthus, A. proximus, A. pseudiodanthus, A. pterocarpus, A. pubentissimus, A. pulsiferae, A. puniceus, A. purshii, A. pycnostachyus, A. racemosus, A. rafaelensis, A. rattanii, A. ravenii, A. recurvus, A. reflexus, A. remotus, A. reventiformis, A. reventus, A. riparius, A. ripleyi, A. robbinsii, A. rusbyi, A. sabulonum, A. sabulosus, A. salmonis, A. saurinus, A. scaphoides, A. schmolliae, A. sclerocarpus, A. scopulorum, A. sepultipes, A. serenoi, A. sericoleucus, A. serpens, A. sesquiflorus, A. sheldonii, A. shevockii, A. shortianus, A. siliceus, A. simplicifolius, A. sinuatus, A. solitarius, A. sophoroides, A. soxmaniorum, A. spaldingii, A. sparsiflorus, A. spatulatus, A. speirocarpus, A. straturensis, A. striatiflorus, A. subcinereus, A. subvestitus, A. succumbens, A. tegetarioides, A. tener, A. tennesseensis, A. tephrodes, A. terminalis, A. tetrapterus, A. thurberi, A. tibetanus, A. tidestromii, A. tiehmii, A. titanophilus, A. toanus, A. toquimanus, A. tortipes, A. traskiae, A. tricarinatus, A. trichopodus, A. tridactylicus, A. troglodytus, A. tweedyi, A. tyghensis, A. umbellatus, A. umbraticus, A. uncialis, A. utahensis, A. vaccarum, A. vallaris, A. vexilliflexus, A. villosus, A. wardii, A. waterfallii, A. webberi, A. welshii, A. wetherillii, A. whitneyi, A. williamsii, A. wingatanus, A. wittmannii, A. woodruffii, A. wootonii, A. wrightii, A. xiphoides, A. yoderwilliamsii, A. zionis |
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| Phaca robbinsii |
Phaca flexuosa |
| (Oakes) A. Gray: Manual ed. 2, 98. (1856) |
(Hooker) Douglas ex G. Don: Gen. Hist. 2: 256. (1832) |
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BC, 
OR, 
WA
Flora NW, 
PNW Herbaria
WildflowerSearch
iNaturalist (observations)
USDA Plants Database
