Brkkdlia. COMPOSIT.E. 105 



H 1— -1— Barely pubescent or glabrate perennial herbs, not viscid: leaves slinder-pelioled, at 



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

 acute, thinni^h: heads halt to two-thirds inch long: involucre subtended by some loose linear- 

 subulate accessory bracts. Typical species. 



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

 deltoid<-ordate or the upper deltoidly ovate-laueeolate, crenate-serrate : heads rather few, 

 loosely corymbosely cymose, 4()-oO-tlo\vereil : involucral bracts somewhat coriaceous, linear, 

 mijstly obtuse: pappiLS rufous or tawny. — Torr. & 'iray, Fl. ii. 80. Eupatorium Brir/.ellia, 

 DC. Prodr. v. 1 8:2. — Wooded hills, W. Georgia and adjacent parts of Alabama and Florida : 

 rare, first coll. by Dr. Biidcell. 

 B. grandiflora, Xltt. I'uberulent or almost glabrous : stem 2 or .3 feet high, panicu- 

 lately branched; the numerous heads paniculate-cymose and drooping: leaves broadh- 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-niargiued "when dried; the short outer ones ovate; inner 

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

 pappus -nhite, inclined to deciduous. — Trans. Am. Phil. Sue. n. ser. vii. i^' ; Torr. & Gray, 

 1. c. Eupatorium? grandijlorum. Hook. Fl. ii. 26. — HiUs along streams of the Kncky 

 Mountains and the Sierra Nevada, from iluntana to the borders of (_)regon, and .south to 

 Xe\\ MexiiL' and Arizona. Name of the speiies not appropriate. 



, Var. petiolaris, (tRav. Heads and leaie.- commonly smaller; the latter inclined to 



hastate-deltoid, and equalled "t even surpassed by the slender jietiole ! — Proc. Am. Acad, 

 xvii. i07. — ilountains of Arizona, Lemmon, and the borders of Xew ilexieo, Rusbij. Passes 

 into the following and into the typical form. 



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

 only an inch or two long, heads proportionally small, involucre 30-3D-flowered. — Clear 

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

 Arizona. 

 B. simplex, Ge.vy. Resembles the preceding : stem a foot or two high, jleuder, simple, 

 bearing a single terminal or 3 or 4 raeeni<jse 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, 

 mostlv obtuse. — PI. Wright, ii. 73. — Shailed hiUs, Arizona, Wright, Thurber, Lemmon. 

 * * Heads !i-:2.>iiijwered (or in the penultimate species 3— 5-flowered), not over half an inch long: 



pappus-bri>tlos scabrous or not manifestly barbellate, except in the penultimate subdivision. 

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

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

 and glabrous : shrubby. 

 B. Coulteri, Gk.it. a foot to a yard high, with numerous spreading slender branches, 

 only the flowering ones herbaceous, minutely pubertdent 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-pcduncled, 

 half-inch hi°-h : involucre about 12-tlowered ; its bracts linear-lanceolate, subulately acumi- 

 nate or acute: akenes pube-eent. — PI. Wright, i. 8G. — Common in Arizona, in cations, 

 first coU. by Conlta: (Adj. Mex., Gregg, Palmfr. ic.) 

 . . 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 corymbi- 

 form cvmes, forming an ample nearly leatless open paniculate thyrsus. 

 B floribunda Ge.^y. Glabrate or barely pubemlent below, but the branches ivith the 

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

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

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

 lono-) 1 5-22-tiowered : bracts of the involucre broadly linear and obtuse, mth some oblong- 

 ova^e aeuri.~h short ones, and often 2 or 3 loose and herbaceous ones subtending the head. — 

 PI. Wright, ii. 73. B. Wrightii, Eothrock in Wheeler Rep. vi. 140, not Gray. 1. c — Ravines 

 and ri^■e^ banks, S. Arizona, Wright, Palmer, Rothrock, Laamon, Pringle. 



