142 LEGUMINOS^E. Dalea. 



2. D. calycosa, Gray. Herbaceous from a biennial or perhaps sometimes per- 

 ennial root, canescent •with a silky puberulenee, diffuse and decumbent, slender, 

 about 6 inches high : leaflets 5 to 13 pairs, oblong-obovate, a line or two long, ob- 

 tuse, glabrous above : flowers 3 lines long, in short loose spikes : peduncles slender : 

 bracts linear : calyx silky ; its teeth narrowly lanceolate, longer than the tube, a little 

 shorter than the purple and white petals. — PI. Wright, i. 40. 



On the San Pedro," S. Arizona (Thurber) ; entrance of the Great Cafion of the Tantillas Mts., he- 

 low San Diego, Palmer. 



3. D. Parryi, Torr. & Gray. Herbaceous, very slender, puberulent or glabrate : 

 leaflets 6 to 10 pairs, obovate to oblong, a line or two long, obtuse : flowers 4 lines 

 long, bright purple, in loose elongated long-peduncled spikes : calyx not half the 

 length of the corolla, canescent with short silky hairs ; its teeth broadly ovate, 

 acute, about equalling the tube : pod smooth. — Gray, Proc. Am. Acad. vii. 397. 

 D. divari'cata, var. cinerea, Gray, 1. c. 335. 



Gravelly hills near Fort Mohave (Cooper) ; also on the Colorado in W. Arizona, near the mouth 

 of Bill Williams Eiver. 



D. Wislizexi, Gray. Somewhat woody at base, erect, slender, a foot high, silky-villous : 

 leaflets 7 to 9 pairs, oblong, obtusish, 2 or 3 lines long : spikes short, rather dense : flowers rose- 

 eolored, 4 lines long, showy, twice longer than the slender very villous calyx-teeth. — Santa Cruz, 

 S. Arizona (Thurber) ; Chihuahua (Wislizenus) ; New Mexico, Wright. 



§ 2. More or less woody and shrubby : claws of the petals adnate to the stamen-tube 

 only at the very base : ovules 2, rarely 4 or 6 : floioers spreading or reflexed, 

 mostly in loose spikes or racemes. ■ — ■ Xylodalba, Watson. 



* Calyx very pubescent ; its teeth slender. 



4. D. Emoryi, Gray. Shrubby, much branched, 2 to 5 feet high, hoary-tomen- 

 tose throughout with a very fine pubescence : leaflets 1 to 3 pairs, narrowly oblong 

 to obovate, 2 to 4 lines long, the terminal leaflet much longer : spikes very short, 

 pedunculate : flowers 2 or 3 lines loug, purple : calyx-teeth as long as the tube, a 

 little shorter than the corolla : ovary pubescent. — PI. Thurb. 315 ; Torr. Pacif. R. 

 Eep. v. 360, t. 11. 



In sandy soils on the Colorado and Gila ; desert east of San Bernardino, Parry. 



5. D. arborescens, Torr. " A small tree," much branched, somewhat spinose, 

 the younger branches, leaves, and calyx densely hoary-tomentose : leaflets 1 to 3 

 pairs, obovate, approximate, 2 or 3 lines long : flowers in short nearly sessile rather 

 close spikes, purple, 4 or 5 lines long : calyx large, but shorter than the corolla, the 

 broader oblong or narrowly lanceolate teeth nearly equalling the tube. — Gray, PI. 

 Thurb. 316. 



Collected only by Fremont at the eastern base of the San Fernando Mountains. 



6. D. polyadenia, Torr. A stout divaricately branched shrub, 2 to 5 feet high, 

 somewhat spinose, canescent with a fine retrorse pubescence, and sprinkled with 

 numerous reddish glands ; the leaflets more hairy and the calyx densely villous : 

 leaflets 3 to 6 pairs, obovate, a line or two long : flowers in short nearly sessile 

 spikes, violet, 3 lines long : catyx-teeth narrow, about equalling the tube, shorter 

 than the corolla : pod scarcely exceeding the calyx, pubescent. — Watson, Bot. King 

 Exp. 64, t. 9. 



In Truekee and Carson Deserts, Northwestern Nevada. 



* * Calyx slightly pubescent ; its teeth broad. 

 +- Leaves pinnate : flowers in loose sp>ihes. 



7. D. Californica, Watson. Shrubby, canescent with a fine appressed pubes- 

 cence, sparingly glandular ; the glands upon the peduncles sometimes prominent 

 and prickle-like: leaflets 1 or 2 pairs, decurrent upon the rhachis, 1 to 1-| lines 



