COMPOSITJE. 431 



quite glabrous: pappus of 10—18 very unequal rigid subulate awns, 

 these slightly hirsute near the dilated base, Var. oli^ocha^ta, Greene. 

 Pappus reduced to 2 marginal awns and some rudiments of intervening 

 ones. — Open plains and hills, chiefly in the region of San Francisco Bay. 

 April — June. 



14. B. Jonesii, Greene, 1. c; Gray, Proc. Am. Acad. xix. 18 (188.3), 

 under Layia. Hispidulous and viscid, also with some sessile glands 

 about the involucre: lower leaves pinnatifld, upper narrowly linear, 

 3-lobed or entire, hispidulous-ciliate: rays only }^ in. long, yellow at 

 base: paleae of pappus ovate to oblong-ovate, acuminate, often erose- 

 deutioulate, not exceeding the corolla-tube; the achenes villous-hirsute. 

 San Luis Obispo Co. 



15. B, nutans, Greene, I. c ; also Pittonia, ii. 227 (1892), under Calli- 

 cJivoa. Low, slender, with divergent branches above the base, 3 — 6 in. 

 high: leaves all linear, entire, the lower pairs opposite, all hirsute-cilio- 

 late: branches, peduncles and involucres glandular-pubescent: rays 

 5 — 7, yellow, 3^4^ in. long: acheues hispidulous: pappus of some 10 un- 

 equal linear-lanceolate acuminate white palepe, their margins barbellate: 

 heads small, nodding both in bud and in fruit. — ^Mountains of Sonoma 

 Co. April— June. 



16. B. chrysanthemoides, Greene, 1. c; DO. Prodr. v. 693(1836), 

 under Oxynra. Aspect of n. 10 preceding; flowers the same: achenes 

 destitute of pappus and all wholly glabrous. — Common in the vicinity 

 of San Francisco Bay. April— June. 



67. ACHYRACHJENA, Schauer. Soft-pubescent sparingly branching 

 annual, with narrow leaves, and rather large oblong-campanulate seem- 

 ingly rayless heads terminating pedunculiform branches. Rays 6 — 8 

 very short, erect: their achenes slightly obcompressed, enclosed, without 

 pappus. Disk-achenes chiefly fertile; clavate, 10-costate, bearing a 

 showy pappus of 10 elongated-oblong obtuse silvery-scarious palese. 

 Chaff of receptacle in a single row, not united, between ray and disk. 



1. A. mollis, Schauer, Del. Sem. Hort. Vratisl., 1837, p. 3; DC. 

 Prodr. vii. 292. Erect, 1 ft. high or less; branches fastigiate: heads 1 in. 

 long: rays very short and involute, light yellow, soon changing to scar- 

 let: globose heads of mature achenes with exijanded pappus very showy. 

 May, June. 



68. LA(iOPHYLLA, NuUall. Slender annuals, rigid and brittle, 

 paniculately branching, witfh many small heads of pale salmon-colored 

 or yellow vespertine flowers. Ray-achenes 5 only, obcompressed, en- 



