332 LEGUMINOSAE 



nearly sessile, ^/4 to 1 inch lonp:, marked with a few large glands and persisting 

 only a few weeks; spikes 14 to 1 inch long; calyx-tube marked by a row of glands; 

 corolla violet-purple, 4 to 5 lines long; ovules 4 to 6. 



Washes and canon bottoms, 5 to 1500 feet : eastern Mohave Desert ; Colorado 

 Desert. Arizona to Sonora and Lower California. Jan.-July. 



Field note. — The Smoke Tree is on the average less than 10 feet high, though individuals 

 11/2 to 2 times that height are not rare. One of the largest colonies of it is found near Palm 

 Springs of San Jacinto. Although recognized as one of the most common arborescent species in 

 the Colorado Desert, it is rarely found in flower, and very rarely in fruit. Abby L. Waterman 

 of Waterman Kanch in the Mohave Desert tells us that on account of its spiny branchlcts it 

 is also called Corona de Cristo and, by the Mexicans along the Colorado River, Ramoceniza, that 

 is "branches of ashes." Young seedlings exhibit simple oblong leaves V2 to 1% inches long 

 lightly sprinkled with brown glands. 



Locs. — Mohave Desert: betw. Klinefelter and Needles, ace. Dix Van DyJce; near Cadiz 

 (Jepson Field Book 27:71) ; Soda Lake (w. of), near Baker sta., Mary Beal; Silver Cliff Mine, 

 ace. Dix Van Dyke ; Kane Springs wash, near Ord Mt., Jepson 15,539 ; Little Chemchuevis Valley, 

 Colorado River, Jepson 5212; Twentynine Palms, Jepson. Colorado Desert: McCoy Wash (Jep- 

 son Field Book 26:107) ; Chuckwalla Bench, Schellenger 2; Pinto Basin, Jepson; Shaver Canon, 

 Jepson; Red Caiion near Mecca, Parish 8167; Coachella Valley, Clary 13; Whitewater, E. J. 

 Smith; Wagon Wash, near Sentenac Caiion, e. San Diego Co., Jepson; Coyote Wells, w. Colorado 

 Desert, A. W. Lohn. 



Refs. — Parosela spinosa Hel. Cat. N. Am. PI., ed. 2, 7 (1900) ; Jepson, Man. 557, fig. 

 548 (1925). Dalea spinosa Gray, Mem. Am. Acad. n. ser. 5:315 (1855), type loc. "arroyos on the 

 Gila; and on the California desert west of the Colorado", Thurher, Fremont. Asagraea spinosa 

 Baill. Adansonia 9:233 (1870). Psoroclendron spinosum Rydb. N. Am. Fl. 24:45 (1919). 



2. P. arborescens Hel. Mohave Dalea. Rather spiny shrub with somewhat 

 slender branches, 2 to 3 feet high; herbage white-tomentose (eventually quite 

 glabrous ) , the upper portion of the branches with scattered short bristle-like yellow 

 glands; leaves % to I14 inches long, pinnately divided into 5 (3 or 7) obovate 

 mostly subequal leaflets 3 to 4 (or 6) lines long ; racemes II/2 to 2 inches long ; calyx 

 3 lines long, its lower teeth recurving, oblong-lanceolate or lanceolate-subulate, 

 nearly as long as tube ; fruiting calyx 5 lines long ; corolla blue, 4 to 5 lines long ; 

 banner obovate, rounded or scarcely emarginate ; ovary and lower part of style 

 densely white-hairy with ascending hairs ; ovules 2, superposed. 



Desert w'ashes and valleys, 2000 to 2500 feet : east central Mohave Desert ; 

 Mono Co. Apr.-May. A rare species. 



Locs. — Helendale (hills se.), Mary Beal; Barstow, Jepson 5513, 5831; Blacks Ranch, Hall 

 4- Chandler 6851 ; Benton, Mono Co., Seller 425. 



Refs. — Parosela arborescens Hel. Cat. N. Am. PL, ed. 2, 5 (1900) ; Jepson, Man. 557 

 (1925). Dalea arborescens Torr. ; Gray, Mem. Am. Acad. n. ser. 5:316 (1855), type loc. stated 

 as "mountains of San Fernando, California", Fremont, but an error, since it is a Mohave Desert 

 species undoubtedly collected at or near Barstow; Parish, Zoe 4:341 (1894). Psorodendron 

 arborescens Rydb. N. Am. Fl. 24:42 (1919). Parosela neglecta Parish, Bot. Gaz. 55:306 (1913), 

 type loc. Fishpond sta. (Daggett), Parish 644. 



3. P. fremontii Vail. Fremont Dalea. Shrub 1 to 3 feet high; nearly gla- 

 brous or the leaves thinly canescent; leaves pinnate; leaflets 3 to 5, narrowly oblong, 

 3 lines long, mostly distinct from rachis; racemes loose, 3 to 5 inches long; calyx 3 

 lines long, finely pubescent outside and inside, its lower teeth subulate, as long as 

 tube; corolla purple, 5 lines long; banner orbicular, notched at apex; lower portion 

 of stj'le and margins of ovary white-hairy with close ascending hairs; ovules 2, 

 sub-collateral. 



Dry mountain slopes and valleys, 2000 to 3000 feet : Owens Valley. East to 

 Nevada and Utah. Apr.-June. 



The original form of Parosela fremontii occurs in southern Utah and Nevada, and recurs 

 sparingly in the Owens Valley in California (Owens Lake, Inyo Co., Jepson 5125a; Benton, Mono 

 Co., Shochley 425). Otherwise the species is represented in California by a series of plants highly 

 variable in outline of leaflets, in pubescence and in glandular character. Because of certain 



