WOOTON AND STANDLEY— FLORA OF NEW MEXICO. 331 



1. Acuan illinoensis (Michx.) Kuntze, Rev. Gen. PI. 1: 158. 1891. 

 Mimosa illinoensis Michx. Fl. Bor. Amer. 2: 254. 1803. 



Acacia brachyloba Willd. Sp. PI. 4: 1071. 1806. 

 Desmanthus brachylobus Benth. Lond. Journ. Bot. 4: 358. 1842. 

 Type locality: "Hab. in pratensibus regionis Illinoensis." 

 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. PI. 1: 158. 1891. 

 Desmanthus jamesii Torr. & Gray, Fl. N. Amer. 1: 402. 1840. 



Type locality: "Sources of the Canadian River," Colorado or New Mexico. Type 

 collected by James. 



Range: 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 1. M. dysocarpa. 



Flowers in spherical heads, yellow or pink. 

 Pinnae 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. 



Pinnae 1 to 3 pairs, glabrous. 



Pods more or less spiny 4. M. borealis. 



Pods not spiny 5. M. fragrans. 



1. Mimosa dysocarpa Benth.; A. Gray, PI. Wright. 1: 62. 1852. 



Type locality: "Mountain valleys in the Pass of the Limpia, and beyond," 

 Texas. 



Range: 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 locality: Near Fort Iluaehuca, southern Arizona. 

 Range: Southern Arizona and New Mexico, south into Mexico. 

 New Mexico: San Luis Mountains. Upper Sonoran Zone. 



3. Mimosa biuncifera Benth. PI. ITartw. L2. L839. 

 Type locality: Mexico. 



Range: Western Texas to southern Arizona and adjacent Mexico. 



New Mexico: From the Black Range to the < hrgan and Guadalupe mountains and 

 southward. I >rv plains and hills, in the Upper Sonoian Zone. 



A common shrnl> about 1 meter high, Occurring in tin- foothills and canyons of the 

 drier and rockier mountains of the southern part of the State. Tim you in; stems are 



