106 COMPOSITE. BrichelUa. 



+H- H-r Foliose, i. e. the heads sessile or short peduncled, terminating short leafy branchlets or in 

 axillary clusters, forming a spiciform, paniculate, or interrupted leafy thyrsus. 



== Involucre naked at base, all the bi-acts dry and chartaceous, glabrous and smooth, the outer- 

 most very short and appressed, wholly destitute of green ti])s. 



a. Leaves mainly with truncate or subcordate base, crenate or dentate, but not laciniate : involucral 

 bracts all obtuse, or innermost linear ones abruptly acute; short outermost oval and ovate: 

 heads 10-20-tl()wered, 4 or 5 lines high. 



B. Rusbyi. Tall, copiously branched, largely herbaceous, amply floriferous, with the habit 

 of B.Jionbunda, except that the inflorescence is thyrsoid-paniculate, minutely puberulent : 

 leaves (2 to 4 inches long) from deltoid-ovate to ovate-lanceolate, with truncate or some 

 with more or less cuueate base, graditally tapering to an acute or acuminate apex, un- 

 equally dentate to or above the middle. — Mountains of New Mexico, Greene, Rushy, G- R. 

 V(isp)/, and of S. Arizona, Leminon. 



B. "Wrightii, Gray. Usually much branched from a woody base, 2 to 4 feet high, puberu- 

 lent, sometimes a little scabrous ; leaves broadly deltoid-ovate, or rounded-cordate and obtuse, 

 or at most acute (but not pi'olonged upward), more or less crenate-dentate (larger cauliue an 

 inch and a half long, smaller only liaK-inch) ; heads glomerate-paniculate, the clusters 

 shorter than or little surjjassing the subtending leaves : involucre often puri^le. — PI. Wright, 

 ii. 72. B. Culifornicu, var.. Gray, PI. Fendl. C4. — W. borders of Texas to Colorado and 

 Arizona, where it is not clearl}' distinguishable from B. Cahfomica. 



Var. tenera. A form with thin dilated-ovate leaves, fewer heads, and pale involucre, 

 evidently growing in shade. — B. tenera, OxSij, PI. Wfight. ii. 72. — Mountain ravines, S. Ari- 

 zona, Wrifjid, Lemwon. 



Var. reniformis. Leaves also thin, broader than long, some of them qtiite reniform, 

 coarsely crenate, mostly surpassing the glomerules of heads. — B. reniformis, Gray, PI. 

 Wright, i. 86 ; an older name than B. Wrightii, but inappropriate for the species, of which 

 this is an extreme form. — Mountain valley near the western border of Texas, Wright. 



B. Californica, Gray. Moderately and virgately branched, 2 or 3 feet high, minutely pu- 

 berulent : leaves ovate, obtuse, rarely subcordate, somewhat crenate-dentate, commonly an inch 

 or less long, mostly surpassed by the small clusters of lieads, these rather spicately glomerate, 

 forming an interrupted strict thyrsus. — PI. Fendl. 64, PI. Wright, i. 8.5, & Bot. Calif, i. 300. 

 Bnlhosti/lis Cavanillesii , DC. Prodr. v. 38, as to Calif, plant. B. Californica, Torr. & Gray, 

 Fl. ii. 79. — California, from Mendocino Co. southward to adjacent parts of Nevada and 

 Arizona, and Utah ? 



b. Leaves cuneate at base, tapering into the petiole, very numerous, incised or deeply toothed, sel- 

 dom an inch long, the upper about equalling the glomerate heads in their axils: involucre 

 narrow, 4 or 5 lines long; bracts mostly obtuse, the outer oblong, innermost linear: much 

 branched and shrubby, 2 to 5 feet high. 



B. baccharidea, Gray. Leaves coriaceous, resinous-atomiferous and very glutinous, 

 rhombic-ovate or oblong, and with 2 to 5 strong teeth to each margin, much reticulated: 

 heads 15-18-flowered. — PL Wright, i. 87. — Mountains of S. W. Texas, east of El Paso, 

 Wright. San Francisco Mountains, N. E. Arizona, Greene. 



B. laciniata, Gray. Leaves thin, puberulent and somewhat scabrous, ovate-cuneate and 

 oblong, laciniate-toothed or lobed, obscurely veiny: heads 9-12-flowered. — PI. Wright. 

 i. 87. B. dentatd, Schultz Bip. Bot. Herald, 301, excl. .syn. DC. — S. W. Texas, east of El 

 Paso, Wright. S. Arizona, Thurher. (Mex., first coll. by Berlandier .) 



= == Involucre of firmer bracts, the outer with greenish and somewhat spreading tips, outermost 

 loose and herbaceous and passing into the small leaves of the branchlets. 



B. microph^Ua, Gray. Glandular-puberulent or pubescent and vi.scid, a foot or two high 

 from a partly woody base, paniculately much branched ; tlie short leafy branchlets termi- 

 nated by 1 to 3 heads : leaves subcordate or ovate to oblong, when old smnewhat scabrous, 

 obtuse or apiculate, sparingly denticulate or nearly entire, the larger half-inch long, those of 

 flowering branchlets a line or two long; heads nearly half-inch long, aliout 1.5-flowered. — 

 PI. Wright, i. 8.5; Bot. Calif, i. 300. Biilbosli/iis mirrophglh, Nutt.Vrans. Am. Phil. Soc. 

 n. ser. vii. 287 ; Torr. & Gray, Fl. i. 79. — Dry interior of Oregon and California in the east- 

 ern part of the Sierra Nevada to Idaho, the mountains of Utah, and S. W. Colorado ; first 

 coll. bv Nnllull. 



