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Classification System: APG IV

Superregnum: Eukaryota
Regnum: Plantae
Cladus: Angiosperms
Cladus: Eudicots
Cladus: Core eudicots
Cladus: Rosids
Cladus: Eurosids I
Ordo: Fabales

Familia: Fabaceae
Subfamilia: Faboideae
Tribus: Amorpheae
Genus: Psorothamnus
Species: P. arborescens – P. dentatus – P. emoryi – P. fremontii – P. kingii – P. polydenius – P. schottii – P. scoparius – P. spinosus – P. thompsoniae
Source(s) of checklist:

Govaerts, R. et al. 2020. Psorothamnus in Kew Science Plants of the World online. The Board of Trustees of the Royal Botanic Gardens, Kew. Published online. Accessed: 2020 Oct 27. Reference page.


Psorothamnus Rydb., 1919

Type species: Dalea emoryi A. Gray.


Asagraea Baill.
Psorodendron Rydb.

Native distribution areas:

Continental: Northern America
Arizona, California, Colorado, Mexico Gulf, Mexico Northeast, Mexico Northwest, Nevada, New Mexico, Texas, Utah

References: Brummitt, R.K. 2001. TDWG – World Geographical Scheme for Recording Plant Distributions, 2nd Edition
Primary references

Rydberg, P.A. in N.L.Britton & al. (eds.), 1919. North American Flora 24: 45.


Govaerts, R. et al. 2020. Psorothamnus in Kew Science Plants of the World online. The Board of Trustees of the Royal Botanic Gardens, Kew. Published online. Accessed: 2020 Oct 27. Reference page.
International Plant Names Index. 2020. Psorothamnus. Published online. Accessed: Oct 27 2020. 2020. Psorothamnus. Missouri Botanical Garden. Published online. Accessed: 27 Oct 2020.
Catalogue of Life: 2021 Annual Checklist

Vernacular names
English: indigo bush

Psorothamnus is a genus of plants in the legume family. These are shrubs and small trees. Many are known by the general common name indigo bush. Some are referred to as daleas, as this genus was once included in genus Dalea. These are generally thorny, thickly branched, strongly scented bushes. Most species bear lupinlike raceme inflorescences of bright purple legume flowers and gland-rich pods. Psorothamnus species are native to the southwestern United States and northern Mexico. The genus is paraphyletic and it has been proposed that the genus Psorodendron be reinstated to accommodate sections Xylodalea, Capnodendron, and Winnemucca.[1][2]

Psorothamnus comprises the following species:[3][4][5]

Psorothamnus arborescens (A. Gray) Barneby—Mojave indigo bush
var. arborescens (A. Gray) Barneby
var. minutifolius (Parish) Barneby
var. pubescens (Parish) Barneby
var. simplicifolius (Parish) Barneby
Psorothamnus emoryi (A. Gray) Rydb.—dyebush, Emory's indigo bush
Psorothamnus fremontii (A. Gray) Barneby—Fremont's indigo bush
var. attenuatus Barneby
var. fremontii (A. Gray) Barneby
Psorothamnus kingii (S. Watson) Barneby—King's dalea
Psorothamnus nummularius (M.E. Jones) S.L. Welsh
Psorothamnus polydenius (S. Watson) Rydb.—Nevada dalea
Psorothamnus schottii (Torr.) Barneby—Schott's dalea
Psorothamnus scoparius (A. Gray) Rydb.—broom dalea
Psorothamnus spinosus (A. Gray) Barneby—smoketree, smokethorn
Psorothamnus thompsoniae (Vail) S.L. Welsh & N.D. Atwood—Thompson's dalea


Cardoso D, Pennington RT, de Queiroz LP, Boatwright JS, Van Wyk BE, Wojciechowski MF, Lavin M (2013). "Reconstructing the deep-branching relationships of the papilionoid legumes" (PDF). S Afr J Bot. 89: 58–75. doi:10.1016/j.sajb.2013.05.001.
McMahon M, Hufford L (2004). "Phylogeny of Amorpheae (Fabaceae: Papilionoideae)". Am J Bot. 91 (8): 1219–1230. doi:10.3732/ajb.91.8.1219. PMID 21653479.
"ILDIS LegumeWeb entry for Psorothamnus". International Legume Database & Information Service. Cardiff School of Computer Science & Informatics. Retrieved 7 July 2014.
USDA; ARS; National Genetic Resources Program. "GRIN species records of Psorothamnus". Germplasm Resources Information Network—(GRIN) [Online Database]. National Germplasm Resources Laboratory, Beltsville, Maryland. Archived from the original on 2015-09-24. Retrieved 7 July 2014.
"The Plant List entry for Psorothamnus". The Plant List. Royal Botanic Gardens, Kew and the Missouri Botanical Garden. 2013. Retrieved 7 July 2014.

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