FLOWERING PLANTS AND FERXS OF ARIZONA 373 



1. Cleomella obtusifolia Ton*, and Frem. in Frem., Exped. Rockv 



Mount. Rpt. 311. 1845. 



Included in the Arizona flora on the basis of specimens labeled 

 "Mohave Desert, Arizona" (Lemmon in 1884), possibly collected at 

 Fort Mohave on the Colorado River, Mohave County. Southeastern 

 California. 



Plant known as Mohave-stinkweed. Doves are said to relish 

 the seeds. 



2. Cleomella longipes Torr., Jour. Bot. and Kew. Gard. Misc. 2: 255. 



1S50. 

 Willeox, in an "alkaline sink," doubtless the extensive playa or old 

 lake bed west of the town (Thornber in 1905), August, type (Wright 

 857) from "west of the Chiricahui Mountains" with Cleome 

 sonorae. Western Texas to southeastern Arizona and Sonora. 



*3. Cleomella plocasperma S. Wats, in King, Geol. Expl. 40th Par. 5: 

 33. 1871. 

 Collected in "southern Utah, northern Arizona, etc." (Palmer 44), 

 not known certainly to occur in Arizona. Southern Utah to California 

 and Oregon. 



3. WISLIZENIA. Jackass-clover 



Plant annual; stems erect, much-branched; leaves 3-foliolate, the 

 leaflets elliptic, oblanceolate, or obovate; flowers very numerous, 

 small, the petals yellow; stamens 6; pods long-stipitate, 1.5 to 2.5 

 mm. long, 2 -seeded, the rounded apex nearly smooth and reticulate to 

 tuberculate-dentate. 



1. Wislizenia refracta Engelm. in Wisliz., Mem. North. Mex. 99. 



1848. 



Wislizenia scabrida Eastw., Torrey Bot. Club Bui. 30: 490. 

 1903. 



Xavajo and Coconino Counties to Pima County, 1,000 to 6,500 

 feet, usually in sandy soil, often very abundant, May to September, 

 types of W. scabrida from near Tucson (Lemmon in 1880, Pringle in 

 1881). Western Texas to southern California. 



Conspicuous in late summer at roadsides and in stream beds. The 

 prevailing form in northeastern Arizona is var. melilotoides (Greene) 

 Johnston (W. melilotoides Greene), characterized by obovate leaflets, 

 these thicker and broader than in the presumably typical form, and 

 by a more compact and leafy appearance. 



4. POLAXISIA. Clammyweed 



Plants annual; stems erect, branched; herbage glandular-pubescent 

 and strong-scented; leaves trifoliolate, the leaflets elliptic or lanceo- 

 late; petals whitish or pale yellow; stamens numerous, the filaments 

 long-exserted, purple; pods sessile or nearly so, elongate, somewhat 

 flattened, tipped by the slender style; seeds numerous. 



1. Polanisia trachysperma Torr. and Grav, Fl. North Amer. 1: 669. 

 1840. 

 Navajo and Coconino Counties to Cochise, Santa Cruz, and Pima 

 Counties, 1,200 to 6,500 feet, usually in sandy stream beds, June to 



