Brickellia. COMPOSITE. 105 



■*-■*-•*- Barely pubescent or glabrate perennial herbs, not viscid : leaves slcnder-petioled, at 

 least all the lower ones opposite, deltoid-ovate or cordate, serrate, mostly acuminate or attenuate- 

 acute, thinnish: heads half to two-thirds inch long: involucre subtended by some loose linear- 

 subulate accessory bracts. Typical species. 



B. COrdifolia, Ell. 1. c. Minutely soft-pubescent ; stem branching, 3 feet high : leaves 

 deltoid-cordate or the upper deltoidly ovate-lanceolate, crenate-serrate : heads rather few, 

 loosely corymbosely cymose, 40-50-flowered : involucral bracts somewhat coriaceous, linear' 

 mostly obtuse: pappus rufous or tawny. — Torr. & Gray, Fl. ii. 80. Eupatorium Brickellia, 

 DC. Prodr. v. 182. — Wooded hills, W. Georgia and adjacent parts of Alabama and Florida : 

 rare, first coll. by Dr. Brickell. 



B. grandiflora, Nr/TT. Puberulent or almost glabrous : stem 2 or 3 feet high, panicu- 

 lately branched ; the numerous heads paniculate-cymose and drooping : leaves broadly or 

 narrowly deltoid-cordate, or the upper deltoid-lanceolate, coarsely dentate-serrate and with 

 an entire gradually acuminate apex (the larger 4 inches long) : involucre about 40-flowered ; 

 its bracts papery and scarious-margined when dried; the short outer ones ovate; inner 

 oblong-linear, obtuse or acutish, or some exterior ones with loose subulate acumination : 

 pappus white, inclined to. deciduous. — Trans. Am. Phil. Soc. n. ser. vii. 287 ; Torr. & Gray, 

 1. c. Eupatorium? grandiflorum, Hook. Fl. ii. 26. — Hills along streams of the Rocky 

 Mountains and the Sierra Nevada, from Montana to the borders of Oregon, and south to 

 New Mexico and Arizona. Name of the species not appropriate. 



Var. petiolaris, Gray. Heads and leaves commonly smaller ; the latter inclined to 

 hastate-deltoid, and equalled or even surpassed by the slender petiole ! — Proc. Am. Acad. 

 xvii. 207.— Mountains of Arizona, Lemmon, and the borders of New Mexico, Rushy. Passes 

 into the following and into the typical form. 



Var. minor, Geat (Proc. Acad. Philad. 1863, 67), is a smaller form, with leaves 

 only an inch or two long, heads proportionally small, involucre 30-35-flowered. — Clear 

 Creek, Colorado, to California in the Sierra Nevada above Lake Tahoe, and mountains of 

 Arizona. 



B. simplex, Gray. Resembles the preceding : stem a foot or two high, slender, simple, 

 bearing a single terminal or 3 or 4 racemose slender-pedunculate comparatively large heads, 

 or producing numerous simple floriferous branches : involucre about 30-flowered, of less 

 imbricated and acute bracts, most of them linear, the outer series very short, as are the few 

 loose subtending ones : leaves 10 to 20 lines long, from deltoid-cordate to deltoid-oblong, 

 mostly obtuse. — PI. Wright, ii. 73. — Shaded hills, Arizona, Wright, Thurber, Lemmon. 

 # # Heads 9-25-flowered (or in the penultimate species 3-5-flowered), not over half an inch long: 



pappus-bristles scabrous or not manifestly barbellate, except in the penultimate subdivision, 

 •i— Leaves slender-petioled, all opposite, deltoid-cordate or triangular-hastate, small: heads pedun- 

 culate, in naked cymes terminating the stem or branches: bracts of the involucre thin, smooth 

 and glabrous : shrubby. 

 B. Coulteri, Graw A foot to a yard high, with numerous spreading slender branches, 

 only the flowering ones herbaceous, minutely puberulent to glabrous : leaves from sparingly 

 laciniate-dentate to nearly entire, acute or acuminate (larger ones an inch long, smaller less 

 than half-inch) : heads rather few in the naked and very open cymes, slender-peduneled, 

 half-inch high : involucre about 12-flowered ; its bracts linear-lanceolate, subulately acumi- 

 nate or acute : akenes pubescent. — PI. Wright, i. 86. — Common in Arizona, in canons, 

 first coll. by Coulter. (Adj. Mex., Gregg, Palmer, &c.) 



4— +- Leaves distinctly petioled, all or mostly alternate: stems shrubby at base: inflorescence 



thyrsiform, 

 ++ Naked when well developed; the heads distinctly peduncled or in pedunculate small coryinbi- 



form cymes, forming an ample nearly leafless open paniculate thyrsus. 



B. floriblinda, Gray. Glabrate or barely puberulent below, but the branches with the 

 inflorescence and outer involucral bracts glandular-pubescent and viscid : stem 4 feet high, 

 woody only at base, much branched : leaves slender-petioled, deltoid-ovate or the lower sub- 

 cordate, irregularly dentate (2 and 3 inches long) ; veins loosely reticulated : heads (5 lines 

 long) 1 5-22-flowered : bracts of the involucre broadly linear and obtuse, with some oblong- 

 ovate acutish short ones, and often 2 or 3 loose and herbaceous ones subtending the head. — 

 PL Wright, ii. 73. B. Wrightii, Rothrock in Wheeler Rep. vi. 140, not Gray, I.e. — Ravines 

 and river banks, S. Arizona, Wright, Palmer, Rothrock, Lemmon, Pringle. 



