Brickellia. COMPOSITE. 107 



+-+-+- Leaves sessile, subsessile, or the lower short-petioled : heads not pendulous. 

 ++ Leaves mainly opposite, veiny: heads mostly pedunculate: bristles of the pappus merely sca- 

 brous or barbellulate-serrulate under a lens: last two species with much imbricated involucre. 

 = Stems lignescent at base, slender. 



B. oliganthes, Gray. Cinereous-puberulent, a foot or two high : leaves coriaceous, from 

 oblong to linear, obtuse, obtusely and often obscurely serrate, an inch or two long, canescent 

 and the veins very prominently reticulated beneath : peduncles mostly elongated, axillary 

 and terminal, 1-3-cephalous, racemosely or somewhat corymbosely disposed : heads half-inch 

 long, 10- 12-flowered : bracts of the involucre mostly acute or acuminate ; the short outermost 

 ovate, innermost linear. — PL Wright, i. 84, & ii. 71. Eupatorium oliganthes, Less, in Linn. 

 iv. 137. Bulbostylis oliganthes, DC. Prodr. v. 139. — S. Arizona, Wright, Tlturber, Lemmon, 

 mostly a narrow-leaved form. (Mex.) 



B. parvula, Grat. Minutely scabro-puberulent, low: leaves deltoid-ovate, coarsely few- 

 toothed, green both sides, barely half-inch long ; the upper oblong, sparse and much smaller : 

 peduncles few and slender, monocephalous, corymbosely disposed at the summit of the stems : 

 head 5 lines long, about 12-flowered : bracts of the involucre few-ranked ; innermost linear, 

 rather obtuse ; outer broader and mucronate-acute. — PL Wright, i. 87. — Mountains of S. W. 

 Texas near the pass of the Eio Limpio, Wright. 



= = Stems herbaceous to the base: leaves reticulate-veiny. 



B. Wislizeni, Gray. Glandular-hirsute, 2 or 3 feet high : cauline leaves lanceolate-oblong 

 with a subcordate closely sessile base, acute, acutely and numerously serrate, thin, loosely 

 veiny, H to 3 inches long ; those of the branches mainly obtuse at base : peduncles axillary 

 and simple and as long as the leaves, or exceeding them on axillary branches, filiform : 

 heads 5 or 6 lines long, 12-20-flowered : bracts of the involucre all lanceolate and gradually 

 acuminate, or the innermost linear. — PL Pendl. 64 ; PL Wright, i. 84, & ii. 71 . — S. Arizona, 

 on mountain-sides, Wright. (Heads rather smaller and fewer-flowered than in the original 

 of adjacent Mex.) 



Var. lanceolata. Loosely paniculate-branched and floribund, the numerous heads 

 smaller : leaves broadly lanceolate, the cauline half-inch wide, those of the branches small, 

 or the upper minute. — San Francisco Mountains, S. E. Arizona, Greene. 



B. betonicsefolia, Gray. More minutely glandular-hirsute : stems 1 to 3 feet high, vir- 

 gate : leaves subcordate-oblong, obtuse, crenate or obtusely dentate, rugosely veiny ; the 

 lower mostly with short but distinct petioles : inflorescence virgate-racemiform : peduncles 

 mostly shorter and the 12-flowered heads rather smaller : otherwise nearly as the preceding. 

 — PL Wright, ii. 72. — Hills, IS T ew Mexico and Arizona, Wright, Thurber, Greene, &c. 



B. Lemmoni, Gray. Cinereous-puberulent, not glandular, slender, a foot or two high : 

 leaves lanceolate, all acute at base and as if with short margined petiole, remotely or obscurely 

 serrate, lightly triplinerved (inch or two long) : heads (5 or 6 lines long) numerous in a 

 rather loose narrow leafy thyrsus, on slender short peduncles, 10-12-flowered : bracts of the 

 involucre nearly all acute ; the rather few and short outer ones ovate- to oblong-lanceolate, 

 inner linear: akenes canescent. — Proc. Am. Acad. xvii. 206. — Chiricahua Mountains, 

 S. Arizona, Lemmon. 



B. Pringlei, Gray, 1. c. Cinereous-puberulent and the foliage scabrous : stem strict, rather 

 stout, 2 feet high : leaves oblong-lanceolate, acute, mostly obtuse at base, on very short but 

 distinct petioles, somewhat serrate, nearly coriaceous, 3-nerved from just above the base, 

 conspicuously and beneath saliently reticulated : heads (half-inch long) in a loose and narrow 

 leafy thyrsus, 20-24-flowered : involucre glabrous, rather longer than the scaly-bracteatc 

 peduncles ; their rounded bracts passing above into the ovate and obtuse or barely mucronu- 

 late outer bracts of the involucre, the innermost of which are lanceolate and acute : akenes 

 canescent. — Eocky canons, S. Arizona, Pringle, Lemmon. 



B. cylindracea, Gray & Engelm. Cinereous-pubescent, somewhat scabrous : stem com- 

 monly stout and strict, 2 to 4 feet high: leaves oblong-ovate to ovate-lanceolate, mostly 

 obtuse at both ends, obtusely serrate, thickish, 3-nerved or triplinerved from near the sub- 

 sessile base (about 2 inches long) : heads (6 to 8 lines long) numerous in a virgate racemiform 

 thyrsus, short-peduncled, sometimes almost sessile, 10-flowered : involucre cylindrical, closely 

 imbricated ; the broadly ovate outer bracts in several ranks, mucronate, multistriate, mostly 

 villous when young ; inner broadly linear, obtuse or mucronulate : akenes pubescent. — 



