Baccharis. COMPOSITE. 223 



petioled, more or less triplinerved, often with 2 to 4 short lobes or teeth ; those of the 

 branches from oblanceoLate to linear, mostly entire, 1-nerved: heads somewhat nakedly 

 paniculate on the branchlets, short-pedunculate or the glomerules more or less pedunculate : 

 involucre campanulate or oblong, 3 or sometimes 4 lines long, mostly of firm coriaceous and 

 obtuse bracts; the outermost oval, inner uhlong, the innermost thin, linear and acutish : pap- 

 pus of male flowers bearded towards tlie tip ; of the female in fruit half-inch long. — But. 

 Mex. Bound. 83, & Bot. Calif, i. 333, described from mere brandies. B. pihilan's, Xutt. 

 Trans. Am. Phil. Soc. 1. c, partly, not DC. B. salicina, Rothr. in Wheeler Rep. vi. 156, 

 & Bot. Calif, ii. 456, partly. — Along watercourses, from Los Angeles southward, through 

 Arizona and in S. Nevada and Utah. 



B. sarothroides, Gray. Erect, fastigiately much branched, 10 to 15 feet high : leaves all 

 nearly linear, entire, 1-nerved, rigid, small ; the larger (less than inch long and 2 lines wide) 

 narrowed at base ; those of the slender and strongly striate-augled branchlets commonly 

 sparse and minute : heads loosely paniculate, terminating ultimate naked branchlets, small : 

 involucre of the male campanulate, hardly 2 lines long ; of tlie female rather oblong, only 

 about 10-flowered; short outer bracts ovate or oval, very obtuse, innermost thin and broadly 

 linear: clavellate tips of male pappus naked: female pappus in fruit 3 lines long. — Proc. 

 Am. Acad. xvii. 212. — S. California, from San Diego to tlie Mexican line, Sutton Hayes, 

 Palmer. Has been confoimded with B. J^moriji and B. serrjiloides. (Adj. Mex.) 



* * * Species of Mexican border, with branchlets terete, less striate, pruinose-scabridons. 



B. pteronioid.es, DC. Diffusely branched: leaves small (rarely half-inch long), crowded 

 and fascicled on tiie branclilets. from lauceolate-spatulate to linear, tliicki.sh, nearly veinless, 

 the larger 2-G-dentate : heads singly terminating very sliort densely leafy branchlets, which 

 are crowded in a virgate or racemose way along the branches : involucre 3 lines long, cam- 

 panulate ; the outer bracts ovate or oblong : pappus of the male flowers not at all clavellate ; 

 of tlie female in fruit 4 lines long, not much surpassing the corolla. — Prodr. v. 410. B. miiiu- 

 losa. Gray, PL Thurb. 301, & Bot. Mex. Bound. 84. Aplopnppus raiimlosus, DC. 1. c. 350. 

 Linosijris (Aplodiscus) ramulosa, Gray, PI. Wright, i. 97, & ii. 80. — New Mexico and Ari- 

 zona. (Mex.) 



§ 3. Pappus rather rigid and scanty, short, not elongated with age, of the fertile 

 flowers even in fruit not surpassing the style : akenes 10-nerved (the 5 primary 

 nerves sometimes the more prominent) : fertile corollas regularly cleft at apex 

 into 5 subulate lobes : some chaff among the flowers on the sometimes elevated 

 receptacle similar to the innermost involucral bracts : branches broom-like. 



B. sergiloides, Gray. Suffj-uticose, glabrous, 3 to 5 feet high, very much branched ; the 

 slender and partly herbaceous branches and branchlets strongly striate-angled and naked, 

 bearing a ie^v small leaves and p.aniculate mostly sliort-pedunculate heads : larger leaves 

 spatulate, entire, rarely 2-4-toothed (the larger seldom over half-inch long) : heads 2 or 3 

 lines long : bracts of the involucre small, oblong or lanceolate, ratlier obtuse, of firm texture : 

 fertile pappus barely twice tlie length of the mature akenes. — Bot. Mex. Bound. 83, Pacif. 

 R. Rep. iv. 101, & Bot Calif, i. 333, partly, and not well characterized. — Arid districts of 

 S. E. California and adjacent Nevada to S. W. Utah, Bi(]clow, Wheeler, Palmer, Parish, &c. 

 Varies in the amount of imbrication of the involucre, and the number of chaffy scales ; when 

 these are numerous the receptacle becomes conical and the disk very convex. 



§ 4. Pappus of the fertile flowers not flaccid, little if at all elongated in fruit, 

 not very copious : akenes only 5-nerved, sometimes 4-nerved. Soutli western, 

 chiefly Pacific species. 



* Scabro-puberulcnt or pubescent tlirouirhout, not glutinous: fruiting pappus manifestly surpass- 

 ing the style: heads loosely paniculate: bracts of the involucre scarious-mart::ined from a green 

 or greenish back or centre, acute or acuminate: stems herbaceous from a woody or merely lig- 

 nescent base, 2 or 3 feet high : leaves not rigid. 

 B. bracliyphylla, Gray. Minutely scabro-puberulent, diffusely much oranched, slender: 

 leaves small, entire, mostly linear, 1-nerved, the larger cauline seldom over half-inch long, on 

 the branchlets mostly becoming minute and scale-like: heads 3 lines long, 12-15-flowered : 



