lOG COMPOSITE. Brickellia. 



++ ++ Foliope, i. e. the heads sessile or short pecluncled, terminating short leafy branchlets or in 

 axillary clusters, forming a spiciform, ])aniculate, or interrupted leafy thyrsus. 



= Involucre nal<ed at base, all tlie 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, crenate or dentate, but not laciniate: invohicral 

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

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



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

 of B.Jloribunda, except that the inflorescence is thyrsoid-pauiculate, niinu^tely puberulent : 

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

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

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

 Vdsi-i/, and of S. Arizona, Lemmon. 



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

 lent, sometimes a little scabrous : leaves broadl}' 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-iuch) : heads glomerate-paniculate, the clusters 

 shorter than or little surpassing the subtending leaves : involucre often purple. — PI. Wright. 

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

 Arizona, where it is not clearly distinguishalde from B. Cal/Jhnuai. 



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

 evidently growing in shade. — B. ?e/?era. Gray, PI. Wright, ii. 72. — Mountain ravines, S. Ari- 

 zona, Wrir/lit, Lemmon. 



Var. reniformis. Leaves also tliin, broader than long, some of them quite reniform, 

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

 Wright, i. 86; an older name than B. Wrig/dit, l)ut inappropriate for the species, of which 

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



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 heads, these rather spicately glomerate, 

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

 Bulhostijlis 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, verj- 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, tiie outer oblong, innermost linear: niucli 

 branched and shrubbj', 2 to 5 feet high. 



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

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

 heads 15-18-flowered. — PL Wright, i. 87. — Mountains of 8. 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. — PL AYriglit. 

 i. 87. B. dentata, 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 viscid, a foot or two high 

 from a i)artly woody base, paniculately much branched ; the sliort leafy branchlets termi- 

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

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

 flowering Ijranchlets a line or two long; heads nearly half-inch long, about 15-flowered. — 

 PI. Wright, i. 85 ; Bot. Calif, i. 300. Biilbosti/Iis microphylla, Nutt. Trans. Am. Phil. Soc. 

 n. 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. 

 SCAIJRA, Gray, I'roc. Am. Acad. xi. 74, is a small-leaved scabrous form. 



