Trilisia. COMPOSITE. 113 



* Leaves all acerose, erect or appressed. 

 C. Pseudo-Liatris, Cass. l. c. Cinereous-pabescent, glabrate below, glaucescent : stems 

 a foot or two high, very strict : leaves with base half-claspiug the stem, rigid, somewhat 

 carinate ; lowest 8 or 10 inches long, a line or less broad; cauline gradually reduced to sub- 

 ulate appressed bracts : heads few or numerous in a small compact terminal cyme : iuvolu- 

 cral bracts ovate-lanceolate, acuminate, densely pubescent. ^ Torr. & Gray, 1. c. ; Bertol. 

 Misc. v. 14. Liatris squamosa, Nutt. Jour. Acad. Philad. vii. 7.3 ; Hook. Comp. Bot. Mag. 

 i. 95. — Grassy pine barrens, Alabama, Middle Elorida, and Mississippi to Louisiana. 



# * Leaves plane, thickish; radical ones spatulate, tapering into a margined petiole; cauline ob- 

 long, short, closely sessile: bracts of tiie involucre pluriserial. 



C. tomentosus, Tore. & Geay, 1. c. About 2 feet high, tomentnlose, or below hirsute 

 and glabrate : heads numerous in the cyme (over half-inch long) : bracts of the involucre 

 canescently hirsute and viscid, mostly acute. — Liatris tomentosa, ]\Iichx. F^ ii. 73. L. Walteri, 

 Ell. Sk. ii. 285, excl. .syn. Walt. — Low pine barrens, N. Carolina to Florida. 



C. COrymbosUS, Tour. & Gray, 1. c. Stouter and taller, minutely hirsute or pubescent : 

 cauline leaves broadly oblong : heads numerous in the compound cyme : involucre glabrous ; 

 the bracts all very obtuse or truncate, inner ones scarious-margined and erose at apex. — 

 Liatris corijmbosa, IS^utt. Gen. ii. 1.32, excl. syn. L. tomentosa, Ell. 1. c, not Michx. — Margin 

 of swamps in pine barrens, N. Carolina to Florida, 



C. bellidifolius, Torr. & Gray, 1. c. About a foot high, rather slender, often branched 

 below the middle, almost glabrous ; cauline leaves narrowly oblong or oblanceolate : heads 

 fewer and scattered, more pedunculate ; involucre of looser bracts ; the lower rather spread- 

 ing, innermost thin and linear, all very obtuse. — Liatris hellidifulia, Michx. 1. c. ; Nutt. 1. c. 

 Anonymos unijlonis, Walt. Car. 198 ? — Sandy woods aud pine barrens, from AVilmington, 

 N. Carolina, to Georgia. 



§ 2. KuHNioiDES, Gray. Pappus a single series of about 15 plumose bristles : 

 flowers white or ochroleucous : bracts of the involucre fewer, in about 3 ranks : 

 stems much branched, shrubby at base, few-leaved : lower leaves opposite : Pacific 

 species. 



C. junceus, Benth. Minutely hispid or glabrate, or above somewhat canescent, 2 or 3 feet 

 high : branches slender and rigid, jnnciform ; the branchlets ofteu leafless, terminated by 

 solitary or 2 or 3 hemispherical heads (of half-inch length) : leaves linear, sometimes sparingly 

 lobed, upper ones filiform or reduced to subulate bracts, or early deciduous : bracts of the 

 involucre obtuse or acutish ; outer ones canescently hirsute and ovate or oblong ; inner ones 

 thin and narrower. — Bot. Snlph. 21 ; Gray, Proc. Am. Acad. viii. 632, & Bot. Calif. 301. — 

 Sandy banks of streams, southern borders of California to Arizona, where the involucral 

 bracts are narrower. (S. Calif., fir.st coll. by Hinds.) 

 C. ATRiPLiciFOMUS, Gray, Proc. Am. Acad. v. 159, from Cape San Lucas, S. California, 



Xantus, is possibly a form of the last, with oblong laciniate-toothed or somewhat hastate leaves, 



on distinct petioles, aud rather oblong heads : specimens iusuflicient. 



18. TRILlSIA, Cass. {Tres, three, licia, threads or girdles; application ob- 

 scure.) — Atlantic U. S. perennials ; with simple and erect rather tall leafy stems, 

 terminating in a thyrsus or panicle of cymules of small heads : leaves entire, oval 

 to lanceolate ; cauline partly clasping, radical much larger and tapering at base 

 into a margined petiole. Flowers rose-purple, autumnal. Involucre of few oval 

 or oblong somewhat herbaceous equal bracts, usually with 2 or 3 small and loose 

 exterior ones. — Bull. Philom., 1818, & Diet. iv. 310; Benth. & Hook. Gen. 

 ii. 248. Liatris § Trilisia, DC., excl. spec. ; Torr. &. Gray, Fl. ii. 7G. 



T. odoratissima, Cass. 1. c. (Vanilla-plant, Houndstongue.) Glabrous : stem 2 or 3 

 feet high : leaves thickish, pale, often glaucous, obscurely-veined, vanilla-scented in drying ; 

 radical and lower cauline 4 to 10 inches long, oval or oblong, upper ones becoming very 

 small: heads (3 or 4 lines long) rather numerous in open cymules, and these cymosely pa- 

 niculate: akenes glandular. — Anouijmos odoratissimus, Walt. Car. 198. Liatris odoratissima, 



