318 COMPOSITE. Riddellia. 



Var. sparsiflora. Heads more scattered and slender-peduncled : paleae of the pappus 

 linear-lanceolate, mostly acute. S. Utah, Bishop, Mrs. Thompson. 



R. Cooperi, GRAY. Canesceut with close and matted tomentum, no villous hairs, or the 

 wholly entire narrow leaves glabrate : stems much branched from a ligneous base : heads 

 scattered, slender-peduncled : paleaj of the pappus from broadly oblong to lanceolate, erose- 

 laciniate at summit or nearly entire, less than half the length of the disk-corolla. Proc. 

 Am. A cad. vii. 358, & Bot. Calif, ii. 373. Gravelly plains and banks, S. E. California to 

 8. Utah and Arizona; first. coll. by Dr. Cooper. 



* * Rays at maturity only a quarter of an inch in length: akenes and pappus long-villous : bien- 

 nial or annual 'i 



R. arachnoidea, GRAY. Loosely lanate : stem and branches rather strict : foliage of R. 

 tagetina : heads clustered, short-peduncled : arachnoid hairs even longer than the somewhat 

 turbiuate akenes : paleaj of the pappus subulate-lanceolate, their margins and apex more 

 or less deliquescent into long and arachnoid hairs. PI. Fendl. 94. Psilostrophe gncipha- 

 lioides, DC. I.e. Western Texas along the Rio Grande, Wright, &c. (Adj. Mex., Ber- 

 landier, Gregg, &c.) 



132. BAILEYA, Harvey & Gray. (Jacob Whitman Bailey, the pioneer 

 in microscopical research in U. S.) Soft and densely floccose-woolly annuals or 

 biennials, of the Texano-Arizonian district ; with alternate leaves, the lower 

 once or twice pinnatifid, and terminal long-pedunculate solitary heads of yellow 

 flowers, the large and persistent rays deflexed in age: fl. summer. PI. Fendl. 

 105; Proc. Am. Acad. ix. 195. 



B. pauciradiata, HARV. & GRAY, 1. c. Villosely and floccosely lanate, a foot or so high, 

 loosely paniculately branched, leafy : leaves sparingly laciniate-pinnatifid or the upper entire, 

 linear : heads small, short-peduncled : involucre quarter-inch high and broad : ligules 5 or 6, 

 roundish-oval, 3 or 4 lines long: disk-flowers 10 to 25 : akenes subclavate, with slightly nar- 

 rowed summit, strongly many-nerved, muriculate-scabrous, obscurely resinous-atom if erous. 



Gray, Bot. Calif, i. 373. Sandy deserts, S. E. California and adjacent Arizona, Coulter, 

 Schott, Cooper, Parish. Still rare. 



B. multiradiata, HARV. & GRAY, 1. c. Densely floccosely white-tomentose, at length much 

 branched from the base and leafy : radical and lower leaves spatulate or broader, mostly 

 laciniate-pinnatifid or sparingly bipinnatifid ; uppermost small, spatulate-linear, entire: heads 

 on slender and often long peduncles : involucre mostly half-inch broad : ligules 25 to 50, 

 cuneate-oblong or at length broader and nearly quadrate, 5 or 6 lines long : disk-flowers 

 very numerous : akenes oblong-prismatic and obscurely striate, broadest at the truncate 

 apex, minutely scabrous and resinous-atomiferous. Torr. in Emory Rep. t. 6; Roth rock in 

 Wheeler, Rep. vi. 175. B. pkniradiata & B. multiradiata, PI. Fendl. 1. c., Bot. Calif. 1. c. ; 

 the former the commoner form, branching and leafy, with more numerous and smaller heads. 



Plains, from W. Texas to S. Utah, Arizona, and the borders of S. E. California; first coll. 

 by Coulter. (Adj. Mex.) 



Var. nudicaulis. More simple-stemmed, or branched only from a stout (biennial?) 

 base : leaves more divided : peduncles elongated, sometimes scapiform : head larger. 

 B. multiradiata, Harv. & Gray, 1. c., mainly. Same range, or more southern. (Adj. Mex.) 



133. "WHITNEY A, Gray. (Josiah D. Whitney, Director of California 

 Geological Survey.)-- Proc. Am. Acad. vi. 549, ix. 105, & Bot. Calif, i. 374. 

 Single species, yellow-flowered ; perhaps most related to Arnica. 



. dealbata, GRAY, 1. c. Low perennial herb, from filiform rootstocks, with aspect of 

 Arnica, cauescent with minute and close tomentum : stems simple or sparingly branched, 

 bearing 2 to 4 pairs of opposite entire leaves, and solitary few slender monocephalous pedun- 

 cles : radical leaves obovate or oblong-spatulate, obtuse, 3-nerved, 2 or 3 inches long ; upper 

 small, lanceolate: head half-inch high: rays inch or more long. Sierra Nevada, California, 

 in Mariposa Co., at 5,000 feet or higher; first coll. by Brewer and Bolander. 



