Baileya. COMPOSITE. 373 



entire pappus-scales, which extends from "W. Arkansas through S. Utah to S. Arizona, where a 

 i'orin with solitary slender peduncled heads was mistaken for the third or following species. 



1. R. Cooperi, Gray. A foot or two high, tomentose-canescent ; somewhat 

 naked with age : leaves narrowly linear, entire, minutely punctate : heads soli- 

 tary on filiform peduncles terminating the branches : akenes glabrous : pappus of 

 oblong erose-laciniate chaffy scales, about a quarter of the length of the glandular 

 disk- corolla. Proc. Am. Acad. vii. 358. 



Fort Mohave, on gravelly banks, Cooper. Also on or near the higher Rio Colorado, Newberry. 

 Leaves an inch or less in length. Involucre about 3 lines long. Kays nearly half an inch long, 

 and about 4 lines broad, usually four in number. Pappus irregularly lacerate-toothed above ; 

 the teeth few, sometimes slender and almost capillary. 



64. BAILEYA, Gray. 



Head many-flowered, with 5 to 50 pistillate rays in one or more series ; all the 

 flowers fertile. Involucre hemispherical, of numerous and nearly equal thin-herba- 

 ceous linear woolly scales, about in two series. Eeceptacle flat or barely convex, 

 naked. Rays large, oval or oblong-cuneate, broadly 3-toothed at the apex, 7-nerved, 

 tapering into a narrow but not tubular base, becoming scarious-papery (but very 

 thin), persistent on the truncate apex of the akene. Disk-corollas tubular-funnel- 

 form above the short proper tube, 5-toothed ; the teeth glandular-bearded. Anthers 

 linear, minutely sagittate at base. Style-branches short, with truncate-capitate 

 apex. Akenes oblong-linear or slightly club shaped, somewhat angled, many- 

 ribbed or striate ; the apex truncate, sometimes obscurely toothed by the extension 

 of the ribs, or in the ray callous-thickened. Pappus none. Floccosely white- 

 woolly herbs (of the Arizona-desert region), apparently all annuals, a foot or so 

 in height ; leaves alternate, soft, the upper lanceolate or linear, the lower once or 

 twice pinnatitid ; heads of yellow flowers terminating slender peduncles, mostly 

 showy from the abundance of the persistent, at length deflexed, thin and sulphur- 

 colored rays. Gray, PI. Fendl. 105, & Proc. Am. Acad. ix. 195. 



This genus, which commemorates one of our worthiest naturalists, the late Professor Bailey, 

 now claims the place which was originally suggested for it, namely, with Riddellia, these two 

 genera with the folfowiug constituting a well-marked subtribe. 



1. B. pauciradiata, Gray, 1. c. Slender, paniculately branched to the summit, 

 somewhat villous as well as woolly : leaves mostly linear, the upper entire, the 

 lower elongated and laciniate-pinnatifid : peduncles slender, seldom over an inch 

 long : head small, rather few-flowered : the oval rays 5 or 6 (short-unguiculate, only 

 3 or 4 lines long) : the disk-flowers 10 to 20 : akenes evenly many-striate, rough 

 Avith minute points. 



Southeastern border of the State, on the Rio Colorado, in sand, Coulter, Schott, Cooper. 



2. B. pleniradiata, Gray, 1. c. Wholly floccose-woolly, much branched from 

 the base : the branches erect, terminating in mostly long solitary peduncles : lowest 

 leaves obovate or spatulate, once or twice pinnatitid into oblong or broadly linear 

 lobes ; the upper linear, 3-cleft or entire : head middle-sized and many-flowered : 

 the rays 25 to 40 in 2 or 3 ranks, dilated-obovate and broadly 3-toothed (4 or 5 

 lines long) : akenes angled with strong and striata with intermediate more slender 

 ribs, minutely scabrous or nearly smooth. 



California, Coulter. Not uncommon in Arizona, and through Sonora and Southern Utah to 

 the borders of Texas : perhaps not collected within the State. 



3. B. multiradiata, Gray, 1. c. Densely floccose-woolly : stem simple or 

 sparingly branched below, bearing long naked or sometimes scape-like peduncles 



