106 COMPOSITE. Brickellia. 



++ ++ 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 bracts dry and chartaceous, glabrous and smooth, the outer- 

 most very short and appressed, wholly destitute of green tips. 



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

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

 heads 10-20-flowered, 4 or 5 lines high. 



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

 of B. ftoribunda, 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 cuneate base, gradually tapering to an acute or acuminate apex, un- 

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

 Vasey, and of S. Arizona, Lemmon. 



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 prolonged upward), more. or less crenate-dentate (larger cauline an 

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

 shorter than or little surpassing the subtending leaves ; involucre often purple. — PL Wright. 

 ii. 72. B. Califomica, var., Gray, PI. Fendl. 64. — W. borders of Texas to Colorado and 

 Arizona, where it is not clearly distinguishable from B. California!. 



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

 evidently growing in shade. — B. tenera, Gray, PI. Wright, ii. 72. — Mountain ravines, S: Ari- 

 zona, Wright, Lemmon. 



Var. reniformis. Leaves also thin, broader than long, some of them quite 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. Califomica, 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 heads, these rather spicately glomerate, 

 forming an interrupted strict thyrsus. — PI. Fendl. 64, PI. Wright, i. 85, & Bot. Calif, i. 300. 

 Bulbostylis Cavanittesii, DC. Prodr. v. 38, as to Calif, plant. B. Califomica, Torr. & Gray, 

 PI. 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. — PI. Wright, i. 87. —Mountains of S. W. Texas, east of El Paso, 

 Wright. San Prancisco Mountains, N. B. 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. dentata, Schultz Bip. Bot. Herald, 301, excl. syn. DC. — S. W. Texas, east of El 

 Paso, Wright. S. Arizona, Thurber. (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. microphylla, Gray. Glandular-puberulent or pubescent and viscid, a foot or two high 

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

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

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



flowering branchlets aline or two long; heads nearly half -inch long, about 15-flowered. 



PI. Wright, i. 85' ; Bot. Calif, i. 300. Bulbostylis microphylla, Nutt. Trans. Am. Phil. Soc. 

 u. ser. vii. 287 ; Torr. & Gray, Fl. ii. 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. Var. 

 soabra, Gray, Proc. Am. Acad. xi. 74, is a small-leaved scabrous form. 



