Mimosa grahamii A. Gray
Description: Spreading or decumbent shrub, 45.0 to 80.0 cm in height at matruity; the branches glabrous to pubescent, with spines usually somewhat hooked, but some may be straight; leaves 5.0 to 10.0 cm in length, the rachis prickly and with 4 to 8 pairs of pinnae, leaflets 8 to 15 pairs per pinna and 4.0 to 6.0 mm long; flowers white to pink, borne in globose axillary heads; fruits (legumes) linear, flat, not strongly constricted between the seeds, 2.0 to 3.5 cm in length, the margins entire or prickly; the leaves, flowers and fruits ranging from glabrous to pubescent.
Distribution: This uncommon species is confined to dry slopes and mesas in the southwest corner of New Mexico at 1,370-1,830 m (4,500-6,000 ft) in elevation. It is common in Arizona and Mexico where several varieties have been described.
Plants Seen or Cited: Carter Herbarium: Two collections from Hidalgo County, one from San Luis Mts. and one collection from Coronado National Forest. ARIZ: Total of 45 collections from AZ, with 25 collections of M. grahamii var. grahamii and 20 collections of M. grahamii var. lemmonii. Both varieties are now considered M. grahamii. NMSU: Total of 6 collections, all from Hidalgo County. Localities of four collections: one collection from Guadalupe Canyon, vicinity of Hadley Ranch; one collection Clanton Canyon: one collection San Luis Mts.; one collection Skeleton Canyon.
Comments: May be confused with several other species of Mimosa in southwest New Mexico, and it is not common, at the same time it is not rare.
Status: Uncommon, but not rare in New Mexico, and common in Arizona.
Carter, Jack L. 1997. Trees and shrubs of New Mexico.
Kearney, T.H. and R.H. Peebles. 1951. Arizona flora.
Martin, W.C. and C.R. Hutchins. 1980. A flora of New Mexico.
Information Compiled By: Jack Carter, 1997