^'^^^- COMPOSITE. 409 



4 to 8 inches long, thin-papyraceous; lobes rounded, copionsly fringed with spinulose teeth, 

 margined-petioled : scapes naked, equaUijig the leaves, bearing solitary or a few pedunculate 

 heads : bracts of the involucre rather few in three series, hinceolate, setace.ju^-acumiuate : 

 pappus rather sordid. — Lag. in herb, ex Bon ; (irav, PI. Feudl. 110, PI. Wright. 1. c. Cla- 

 rionea runiinata, Don in Trans. Linn. Soc. xvi. 207 ;"dC. 1. c — Drv ground, E. & S Texa,-s 

 Wriyht, Hall, &c. (Adj. Mex.) 



.^ P. nana, Gray. Leafy-stemmed, glabrous : rootstocks slender, creeping : first leaves small 

 and scale-like; principal cauline leaves firm-chartaceous, orbicnlate, dilated-obovate, or 

 ovate (inch or two lung), coarsely spinulose-dentate, sessile or partly clasping the slender 

 stem: heads mostly sessile, soHtary and terminal . bracts of involucre's or 4 series, thinnish, 

 acutish ; the short outer ones ovate, iunerniust lanceolate, mucronulate : pappus white. — 

 PI. Fendl. 111. —Dry plains and rocky bluffs, S. W. Texas to Arizona, Wright, Palmer, &c. 

 (Mex., first coU. by Omgg.) 



# * Taller, 1 to 3 feet high, branching, especially above, leafy up to the corymbiform polycepha- 

 lous inflorescence: leaves closely sessile by sagittate-cordate" or sometimes truncate base, "densely 

 and spinulosely denticulate: heads 5-1.5-flowered, narrow, half-inch or less long, subsesfile and 

 fasciculate-crowded or short-pedicellcd, quite naked at base: involucral bracts thinnish, not 

 very man_\', in only three series : flowers rose-purple and sometimes white in the same species : 

 pappus white, soft. 



-)— Involucre 8-15-flowered ; its bracts not attenuate-acuminate. 



_P. Wrightii, Ge.iy. Glabrous throughout, or obscurely puberulent, but smooth : leaves 

 thin, oblong to nearly ovate (larger 4, smaller 1 or 2 inches long), often unequally or doubly 

 dentate: heads 8-12-flowered : involucral bracts aU pointless and obtuse, or the narrow 

 innermost barely acutish: corollas pale rose to whitish. — PL AVright. i. 127, ii. 102; & 

 Proc. Am. Acad. xix. 60. P. Arlzonlca, Gray, But. Calif, i. 422, a form of drier districts, 

 rather more rigid, tlie involucral bracts all rounded-obtuse. P. C'oulterl, Gray, Proc. Am. 

 Acad. XV. 40, as to pi. Parry & Palmer, no. 2.34. — Eocky hills and ravines, S. "w. Texas to 

 S. Arizona; first coll. by Coulter, then by Wriglit. (Mex., S<:haffner, Parrg & Palmer.) 



"P. microcepltala. Gray. Scabro-puberalent and minutely rcsinon.s-glandular : leaves 

 more chartaceous, oblong, commonly obtuse, finely and closely denticulate- heads 10-1.5- 

 iiowered, larger than in preceding (over haH-inch long when well develnped) : involucral 

 bracts seaberulous on the back, abruptly acute or mucronate-acuminate : corollas rose-color. 

 — PI. Wright, i. 127, & Bot. Calif, i. 422. Armirtla viicrucephala, DC. Prodr. vii. 66. — Cali- 

 fornia, on hiUs back of Monterey 1 (Douglas), Santa Barbara, and San Diego. 

 H^ -f— Involucre 5-6 flowered; bracts attenuate-acuminate: fully developed heads half-inch long. 



P. Thurberi, Gray. Scabro-puberulent, viscidulous-glandular : leaves firm-chartaceous, 

 oblong-ovate, denticulate and partly doubly dentate (larger .5 to 8 inches long) : involucral 

 bracts lanceolate, gradually tapering to a very acute point, seaberulous externally : corollas 

 sometimes deep rose-color, sometimes white. — PI. Thurb. in Mem. Am. Acad. v. 324, & 

 Proc. Am. Acad. xix. 59. — S. Arizona, on rocky hills, Thurber, Lemmon. 



206. TRfXIS, p. Browne. (TptfJs, threefold, the corolla being trifid.) — 

 American, chiefly subtropical, fruticose or perennial herbaceous plants ; with en- 

 tire or merely denticulate leaves, and pauiculately or corymbosely cymose heads, 

 of moderate size; the corollas yellow or sometimes whitish. — Hist. Jam. 312; 

 Lag. Amoen. Xat. i. 35. Perdicium, L., in part. 



T. angustifolia, DC. Suffruticose, fastigiately or corymbosely much branched, a foot or 

 two high, sericeous-puberulent, from sulnanescent to glabrate, somewhat resinous-atomifer- 

 ous, leafv np to the heads : leaves sessile, rather rigid, from broadly to very narrowly lan- 

 ceolate, entire or denticulate with sparse mucroniform teeth (2 or 3 inclies long) : heads 

 simply fascicled or singly terminating leafy branchlets, half-inch and more long, 9-12-flow- 

 ered subtended by a few lanceolate or linear bracteiform leaves which do not exceed the 8 

 or 10 linear-lanceolate and equal proper bracts of the involucre; these in age gibbons and 

 indurated at base: receptacle copiously villous: corollas golden yellow; outer lip of the 

 marginal ones quarter-inch long : pappus barely fulvous. — Prodr. vii. 69 ; Gray, PI. ATright. 

 i. 128, ii. 102. T. frutescens, Gray, Bot. Mex. Bound. 103, vars. T. Callfornica, Kellogg 



