CATALOGUE. 167 



or two high, tomentose-canescent ;, somewhat naked with age : leaves nar- 

 rowly linear, entire, minutely punctate : heads solitary on filiform peduncles 

 terminating the branches: akenes glabrous: pappus of oblong erose- 

 laciniate chaffy scales, about a quarter the length of the glandular disk 

 corolla." Not having the specimen, I have been obliged to quote the above 

 from Fl. Cal. 1, p. 373. Arizona. 



Riddellia tagetina, Nutt — A foot high, floccose-woolly or smoother 

 with age, much branched ; leaves sessile, narrowly spatulate or oblanceo- 

 late, 8-18" long ; heads in clusters on the ends of the branches ; scales of 

 the pappus entire, about (or more than) half as long as the tube of the disk- 

 flowers; rays somewhat puberulent externally. — Camp Bowie, Ariz. (463), 

 and Alcadonis, N. Mex. (82). 



Ch^nactis Douglasii, Hook. & Arn. — Colorado, about South Park 

 (481, 482) ; also from Nevada and Utah. 



Ch.enactis stevioides, Hook. & Arn. — Independence Valley, Nevada. 



Hymenopappus luteus, Nutt. — Arizona, Colorado, and New Mexico. 



Hymenopappus flavescens, Gray (PI. Fendl. p. 97). — Leaves less dis- 

 sected and divisions larger than in the following variety, in which the 

 flowers are a real yellow. — A somewhat variable species. Colorado. 



Hymenopappus canescens, var. cano-tomentosus, Gray (PI. Wright. 2, 

 p. 94, and PI. Fendl. p. 97). — Erect, floccose-tomentose ; leaves bipinnately 

 parted ; segments 3" long and J" wide ; inflorescence in a cymose panicle ; 

 heads 4" in diameter ; scales of the involucre with petaloid and somewhat 

 scarious tips ; chaff of the pappus entire, oval, one-half or one-third as long 

 as the tube of the corolla ; achenia turbinate, obscurely 3-5-angled, 15- 

 nerved, villose. — Western New Mexico, Loew. 



Bahia leucophylla, DC. — Nevada. 



Bahia absinthifolia, Benth., var. dealbata, Gray. — Erect, branch- 

 ing from a sub-ligneous root, canescent-tomentose ; leaves oblong, trifid 

 at base, with middle division often toothed toward the apex or entire, 

 linear-lanceolate obtuse ; heads, including the rays, 8" in diameter ; invo- 



Style-branches of the disk-flowers short, truncate-capitate at the apex. Akenes narrow, terete or nearly 

 so, obscurely striate or angled, glabrous, or in ODe species cobwebby-villous. Pappus of 4 to 6 hyaline 

 nerveless and pointless chaffy scales. — Low and branching woolly herbs, probably ail perennial ; with 

 alternate, spatulate or linear leaves, either entire, or the radical ones piunately incised, and corymbose 

 small heads of golden yellow flowers." — Gray, Fl. Cal. 1, p. 372. 



