WOOTON AND STANDLEY—FLORA OF NEW MEXICO. 831 
1. Acuan illinoensis (Michx.) Kuntze, Rev. Gen. Pl. 1: 158. 1891. 
Mimosa illinoensis Michx. Fl, Bor, Amer. 2: 254. 1803. 
Acacia brachyloba Willd. Sp. Pl. 4: 1071. 1806. 
Desmanthus brachylobus Benth. Lond. Journ. Bot. 4: 358. 1842. 
Type Loca.ity: ‘‘Hab. in pratensibus regionis I]linoensis.”’ 
RanGE: Minnesota to Florida, Colorado, and New Mexico. 
New Mexico: Albuquerque; Socorro; Sabinal; Mesilla Valley; Roswell; Lakewood; 
Dayton; Perico. River valleys, in the Lower and Upper Sonoran zones. 
2. Acuan jamesii (Torr. & Gray) Kuntze, Rev. Gen. Pl. 1: 158. 1891. 
Desmanthus jamesii Torr. & Gray, Fl. N. Amer. 1: 402. 1840. 
Type Locauity: ‘‘Sources of the Canadian River,’’ Colorado or New Mexico. Type 
collected by James. 
Rance: Oklahoma and Texas to Arizona. 
New Mexico: Rio Zuni; Mogollon Mountains; Kingston; Silver City; Organ Pass; 
west of Roswell; Gray; Nara Visa, Redlands; Knowles; Buchanan. Dry hills and 
plains, in the Upper Sonoran Zone, 
7. MIMOSA L. Cat-cLaw. 
Low shrubs, the stems armed with hooked spines; leaflets small; flowers in spikes 
or heads, small; sepals and petals 5; stamens 10, distinct; fruit a flattened pod, armed 
or unarmed, sometimes constricted between the seeds. 
KEY TO THE SPECIES, 
Flowers in spikes, pink..................-2 00. eee eee eee cece eee eeee 1. M. dysocarpa. 
Flowers in spherical heads, yellow or pink. 
Pinnze 4 to 7 pairs, pubescent. 
‘Young stems not flexuous, somewhat virgate; pods usually 
not constricted between the seeds, straight.......... 2. M. lemmoni. 
Young stems flexuous; pods more or less constricted between 
the seeds, conspicuously arcuate................... 3. M. biuncifera. 
Pinnz 1 to 3 pairs, glabrous. 
Pods more or less spiny.........-.--.------------ eee eee eee 4. M. borealis. 
Pods not spiny..........2........2. 222022 eee eee 5. M. fragrans. 
1. Mimosa dysocarpa Benth.; A. Gray, Pl. Wright. 1: 62. 1852. 
Type Loca.iry: ‘‘Mountain valleys in the Pass of the Limpia, and beyond,”’ 
Texas. 
RanGeE: Western Texas to southern Arizona and adjacent Mexico. 
New Mexico: Fort Bayard; Animas Mountains; San Luis Mountains; Little Burro 
Mountains. Upper Sonoran Zone. 
A rather uncommon species in the southwestern part of the State in the lower moun- 
tains. The spikes of pink flowers and the yellow young stems are characteristic. 
The young pods are densely velutinous. 
2. Mimosa lemmoni A. Gray, Proc. Amer. Acad. 19: 76. 1883. 
Type Locauity:. Near Fort Huachuca, southern Arizona. 
RanGeE: Southern Arizona and New Mexico, south into Mexico. 
New Mexico: San Luis Mountains. Upper Sonoran Zone. 
3. Mimosa biuncifera Benth. Pl. Hartw. 12. 1839. 
TYPE LocaLity: Mexico. 
RANGE: Western Texas to southern Arizona and adjacent Mexico. 
New Mexico: From the Black Range to the Organ and Guadalupe mountains and 
southward. Dry plains and hills, in the Upper Sonoran Zone. 
A common shrub about 1 meter high, occurring in the foothills and canyons of the 
drier and rockier mountains of the southern part of the State. The young stems are 
