Astragalus laxmannii

Astragalus laxmannii, the standing milkvetch, Tanana milkvetch, or Laxmann's milkvetch, is a species of flowering plant in the family Fabaceae.^[2] It is native to Kazakhstan, Siberia, Mongolia, China, Korea, Japan (where it is called ムラサキモメンヅル (murasaki momenjiru - lit. purple cotton vine)), Canada, and the northwestern and north-central United States.^[1] A perennial reaching 16 in (41 cm), it is typically found in dry soils with little organic content in otherwise wetter areas.^[2][3] Asian populations were previously considered to be a separate species, Astragalus adsurgens Pall..^[4]

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  Close-up of flowers
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  Undersides of leaflets
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  Pods

Astragalus laxmannii
A silvery blue feeding on flowers in the Sand Lake Wetland Management District
In Wyoming
Scientific classification
Kingdom:	Plantae
Clade:	Tracheophytes
Clade:	Angiosperms
Clade:	Eudicots
Clade:	Rosids
Order:	Fabales
Family:	Fabaceae
Subfamily:	Faboideae
Genus:	Astragalus
Species:	A. laxmannii
Binomial name
Astragalus laxmannii Jacq.
Synonyms[1]
List Astragalus adsurgens Pall. Astragalus adsurgens var. albifolius Blank. Astragalus adsurgens f. chandonnetii (Lundell) B.Boivin Astragalus adsurgens var. fujisanensis (Miyabe & Tatew.) Kitag. Astragalus adsurgens var. laxmannii (Jacq.) Trautv. Astragalus adsurgens f. leucantha Takeda Astragalus adsurgens subsp. oreogenus (Jurtzev) Vorosch. Astragalus adsurgens var. paucijugus E.Peter Astragalus adsurgens var. pauperculus Blank. Astragalus adsurgens var. prostratus DC. Astragalus adsurgens subsp. robustior (Hook.) S.L.Welsh Astragalus adsurgens var. robustior Hook. Astragalus adsurgens var. tananaicus (Hultén) Barneby Astragalus adsurgens subsp. viciifolius S.L.Welsh Astragalus austrosibiricus Schischk. Astragalus chandonnetii Lundell Astragalus crandallii Gand. Astragalus fujisanensis Miyabe & Tatew. Astragalus gmelinii Scop. Astragalus inopinatus Boriss. Astragalus inopinatus subsp. fujisanensis (Miyabe & Tatew.) Kitag. Astragalus inopinatus subsp. oreogenus Jurtzev Astragalus inopinatus subsp. substepposus Jurtzev Astragalus karoi Freyn Astragalus laxmannii Nutt. Astragalus laxmannii var. adsurgens (Pall.) Kitag. Astragalus laxmannii subsp. fujisanensis (Miyabe & Tatew.) Kitag. Astragalus laxmannii var. robustior (Hook.) Barneby & S.L.Welsh Astragalus laxmannii var. tananaicus (Hultén) Barneby & S.L.Welsh Astragalus longispicatus Ulbr. Astragalus marianus C.Huber Astragalus microphyllus Georgi Astragalus nitidus Douglas ex Hook. Astragalus nitidus var. robustior (Hook.) M.E.Jones Astragalus oostachys E.Peter Astragalus oreogenus (Jurtzev) Knjaz. Astragalus prostratus Fisch. ex Turcz. Astragalus semibilocularis Fisch. ex Bunge Astragalus semibilocularis DC. Astragalus striatus Nutt. Astragalus sulphurescens Rydb. Astragalus sulphurescens var. pinicola E.H.Kelso Astragalus syriacus Pall. ex Ledeb. Astragalus tananaicus Hultén Astragalus viciifolius Hultén Phaca adsurgens (Pall.) Piper Phaca laxmannii (Jacq.) Medik. Solenotus adsurgens (Pall.) Steven Tragacantha adsurgens (Pall.) Kuntze Tragacantha laxmannii (Jacq.) Kuntze Tragacantha semibilocularis Kuntze

Subtaxa

The following subspecies are accepted:^[1]

• Astragalus laxmannii subsp. laxmannii – Kazakhstan, Siberia, the Russian Far East (except Sakhalin, the Kurils, and Kamchatka), Mongolia, China, Korea, Japan
• Astragalus laxmannii subsp. robustior (Hook.) Podlech – Canada (but not Nunavut or east of Ontario), northwestern and north-central USA (but not Kansas, Oklahoma, Wisconsin, Illinois, or Missouri), and Utah and New Mexico
• Astragalus laxmannii subsp. viciifolius (S.L.Welsh) Podlech – east-central Alaska, southern Yukon