Taxon: Astragalus wootonii E. Sheld.

Summary

Genus:

Astragalus

Family:

Fabaceae (alt. Leguminosae)

Subfamily:

Faboideae

Tribe:

Galegeae

Subtribe:

Astragalinae

Nomen number:

404224

Place of publication:

Minnesota Bot. Stud. 1:138. 1894 "wootoni"

Verified:

01/18/1996 ARS Systematic Botanists.

Accessions:

3 (0 active, 0 available) in National Plant Germplasm System. (Map it)

Other conspecific taxa

Autonyms (not in current use), synonyms and invalid designations

Autonym(s)
Astragalus wootonii E. Sheld. var. wootonii

Heterotypic Synonym(s)
Astragalus allochrous A. Gray var. playanus (M. E. Jones) Isely
Astragalus playanus M. E. Jones

No images

Conservation Status

Reference(s)

Barneby, R. C. 1964. Atlas of North American Astragalus. Part II. The Cercidothrix, Hypoglottis, Piptolodoid, Trimeniaeus and Orophaca Astragali. Mem. New York Bot. Gard. 13:866-869.
Charboneau, J. L. M. et al. 2021. Plastome structural evolution and homoplastic inversions in Neo-Astragalus (Fabaceae). Genome Biol Evol 13:evab215. DOI: 10.1093/gbe/evab215.
Correll, D. S. & M. C. Johnston. 1970. Manual of the vascular plants of Texas
Everitt, J. H. et al. 1994. Light reflectance characteristics and remote sensing of Big Bend Loco (Astragalus mollissimus var. earlei) and Wooton Loco (Astragalus wootonii). Weed Sci. 42:115-122.
Hickman, J. C., ed. 1993. The Jepson manual: higher plants of California Note: = Astragalus allochrous var. playanus (M. E. Jones) Isely
Kingsbury, J. M. 1964. Poisonous plants of the United States and Canada. Note: poisonous
McVaugh, R. 1983-. Flora Novo-Galiciana.
Nelson, L. S. & M. J. Balick. 2020. Section 5. Individual plants. In: Nelson, L. S., Handbook of poisonous and injurious plants, 3rd edition 51-302. DOI: 10.1007/978-1-4939-8926-3_5. Note: cites in pages 82-83.
Villaseñor, J. L. 2016. Checklist of the native vascular plants of Mexico. Rev. Mex. Biodivers. 87:559-902. DOI: 10.1016/j.rmb.2016.06.017.

Common names

Language	Name	Alternate name	note	seq	Citation
English	Wooton's milk-vetch			1	Barneby, R. C. 1964. Atlas of North American Astragalus. Part II. The Cercidothrix, Hypoglottis, Piptolodoid, Trimeniaeus and Orophaca Astragali. Mem. New York Bot. Gard. 13:866-869.

Distribution

order_code	Status	Continent	Subcontinent	Country	State	Note	Reference
1	Native	Northern America	Northern Mexico	Mexico	Chihuahua		McVaugh, R. 1983-. Flora Novo-Galiciana.
1	Native	Northern America	Northern Mexico	Mexico	Coahuila de Zaragoza	w.	McVaugh, R. 1983-. Flora Novo-Galiciana.
1	Native	Northern America	Northern Mexico	Mexico	Durango		McVaugh, R. 1983-. Flora Novo-Galiciana.
1	Native	Northern America	Northern Mexico	Mexico	Nuevo León		Villaseñor, J. L. 2016. Checklist of the native vascular plants of Mexico. Rev. Mex. Biodivers. 87:559-902. DOI: 10.1016/j.mb.2016.06.017.
1	Native	Northern America	Northern Mexico	Mexico	San Luis Potosí		McVaugh, R. 1983-. Flora Novo-Galiciana.
1	Native	Northern America	Northern Mexico	Mexico	Sonora	n.	McVaugh, R. 1983-. Flora Novo-Galiciana.
1	Native	Northern America	Northern Mexico	Mexico	Tamaulipas		Villaseñor, J. L. 2016. Checklist of the native vascular plants of Mexico. Rev. Mex. Biodivers. 87:559-902. DOI: 10.1016/j.mb.2016.06.017.
1	Native	Northern America	Northern Mexico	Mexico	Zacatecas	n.w.	McVaugh, R. 1983-. Flora Novo-Galiciana.
1	Native	Northern America	South-Central U.S.A.	United States	New Mexico		Barneby, R. C. 1964. Atlas of North American Astragalus. Part II. The Cercidothrix, Hypoglottis, Piptolodoid, Trimeniaeus and Orophaca Astragali. Mem. New York Bot. Gard. 13:866-869.
1	Native	Northern America	South-Central U.S.A.	United States	Texas		Barneby, R. C. 1964. Atlas of North American Astragalus. Part II. The Cercidothrix, Hypoglottis, Piptolodoid, Trimeniaeus and Orophaca Astragali. Mem. New York Bot. Gard. 13:866-869.
1	Native	Northern America	Southern Mexico	Mexico	Aguascalientes		Villaseñor, J. L. 2016. Checklist of the native vascular plants of Mexico. Rev. Mex. Biodivers. 87:559-902. DOI: 10.1016/j.mb.2016.06.017.
1	Native	Northern America	Southern Mexico	Mexico	Ciudad de México		Villaseñor, J. L. 2016. Checklist of the native vascular plants of Mexico. Rev. Mex. Biodivers. 87:559-902. DOI: 10.1016/j.mb.2016.06.017.
1	Native	Northern America	Southern Mexico	Mexico	Guerrero		Villaseñor, J. L. 2016. Checklist of the native vascular plants of Mexico. Rev. Mex. Biodivers. 87:559-902. DOI: 10.1016/j.mb.2016.06.017.
1	Native	Northern America	Southern Mexico	Mexico	Hidalgo		McVaugh, R. 1983-. Flora Novo-Galiciana.
1	Native	Northern America	Southern Mexico	Mexico	Jalisco		Villaseñor, J. L. 2016. Checklist of the native vascular plants of Mexico. Rev. Mex. Biodivers. 87:559-902. DOI: 10.1016/j.mb.2016.06.017.
1	Native	Northern America	Southern Mexico	Mexico	México		McVaugh, R. 1983-. Flora Novo-Galiciana.
1	Native	Northern America	Southern Mexico	Mexico	Michoacán de Ocampo		McVaugh, R. 1983-. Flora Novo-Galiciana.
1	Native	Northern America	Southern Mexico	Mexico	Puebla		McVaugh, R. 1983-. Flora Novo-Galiciana.
1	Native	Northern America	Southern Mexico	Mexico	Querétaro		Villaseñor, J. L. 2016. Checklist of the native vascular plants of Mexico. Rev. Mex. Biodivers. 87:559-902. DOI: 10.1016/j.mb.2016.06.017.
1	Native	Northern America	Southern Mexico	Mexico	Veracruz de Ignacio de la Llave		Villaseñor, J. L. 2016. Checklist of the native vascular plants of Mexico. Rev. Mex. Biodivers. 87:559-902. DOI: 10.1016/j.mb.2016.06.017.
1	Native	Northern America	Southwestern U.S.A.	United States	Arizona		Barneby, R. C. 1964. Atlas of North American Astragalus. Part II. The Cercidothrix, Hypoglottis, Piptolodoid, Trimeniaeus and Orophaca Astragali. Mem. New York Bot. Gard. 13:866-869.
1	Native	Northern America	Southwestern U.S.A.	United States	California	San Bernardino Co. (e.)	Barneby, R. C. 1964. Atlas of North American Astragalus. Part II. The Cercidothrix, Hypoglottis, Piptolodoid, Trimeniaeus and Orophaca Astragali. Mem. New York Bot. Gard. 13:866-869.

Native
Northern America

SOUTH-CENTRAL U.S.A.: United States [New Mexico, Texas]
SOUTHWESTERN U.S.A.: United States [Arizona, California (San Bernardino Co. (e.))]
NORTHERN MEXICO: Mexico [Chihuahua, Coahuila de Zaragoza (w.), Durango, Nuevo León, San Luis Potosí, Sonora (n.), Tamaulipas, Zacatecas (n.w.)]
SOUTHERN MEXICO: Mexico [Aguascalientes, Ciudad de México, Guerrero, Hidalgo, Jalisco, México, Michoacán de Ocampo, Puebla, Querétaro, Veracruz de Ignacio de la Llave]

Reference(s)

Barneby, R. C. 1964. Atlas of North American Astragalus. Part II. The Cercidothrix, Hypoglottis, Piptolodoid, Trimeniaeus and Orophaca Astragali. Mem. New York Bot. Gard. 13:866-869.
McVaugh, R. 1983-. Flora Novo-Galiciana.
Villaseñor, J. L. 2016. Checklist of the native vascular plants of Mexico. Rev. Mex. Biodivers. 87:559-902. DOI: 10.1016/j.mb.2016.06.017.

Economic Uses

Usage	Type	Note	Reference
Vertebrate poisons	mammals	to livestock	Barneby, R. C. 1964. Atlas of North American Astragalus. Part II. The Cercidothrix, Hypoglottis, Piptolodoid, Trimeniaeus and Orophaca Astragali. Mem. New York Bot. Gard. 13:866-869.
Vertebrate poisons	mammals	to livestock	Kingsbury, J. M. 1964. Poisonous plants of the United States and Canada. Note: poisonous
Vertebrate poisons	mammals	to livestock	Correll, D. S. & M. C. Johnston. 1970. Manual of the vascular plants of Texas
Vertebrate poisons	mammals	to livestock, manifests as locoism	Nelson, L. S. & M. J. Balick. 2020. Section 5. Individual plants. In: Nelson, L. S., Handbook of poisonous and injurious plants, 3rd edition 51-302. DOI: 10.1007/978-1-4939-8926-3_5. Note: cites in pages 82-83.

Cite as: USDA, Agricultural Research Service, National Plant Germplasm System. 2026. Germplasm Resources Information Network (GRIN Taxonomy). National Germplasm Resources Laboratory, Beltsville, Maryland.
URL: https://npgsweb.ars-grin.gov/gringlobal/taxon/taxonomydetail?id=404224. Accessed 24 October 2026.