92 COMPOSIT.E. Stevia. 



* * * Heads subsessile and fasciculate; the fascicles corymbosoly cvniose: root perennial. 

 -1— Herbaceous, leafy up to the dense fastiyiate clusters of heads: leaves subsessile, serrate. 



S. serrata, Cav. Pubescent or somewhat hirsute : leaves often alternate, crowded, from 

 spatulate-liiiear to oblong-spatulate, irregularly and sometimes coarsely serrate or some 

 entire, loosely veiny, strongly punctate: flowers white or pale rose: pappus 1-5-aristate or 

 in some flowers reduced to a crown of short obtuse paleaj. — Ic. iv. t. .355 ; DC. Prodr. v. 

 118. S. inr'foUa, Willd. Mag. Naturf. Berl. 1807, 137, & Enum. 855. S. cancscens, HBK. 

 Nov. Gen. & Spec. iv. 143; Benth. PI. Hartw. 19; Gray, PI. Wright, ii. 71. S.vmjota, 

 HBK. 1. c. S. punctata, Schultz Bip. in Linn. xxv. 286. Ageratum punctatum, Jacq. Hort. 

 Sclioenbr. iii. t. 300. (Variable species.) — New Mexico and Arizona, WriijJd and later 

 collectors. (Mex., Venezuela.) 



S. Prdmmerse, Gray. Puberulent and almost glabrous : leaves nearly all opposite, le.ss 

 crowded, oljlong-lanceolate or broader, acute, incisely serrate, bright green, very conspicu- 

 ously nervose-veiny and reticulated, hardly punctate (2 inches long): flowers rose-color: 

 pappus of 4 broad and truncate fimbriate-denticulate palese. — Proc. Am. Acad. xvii. 204. — 

 S. Arizona, Rucker Valley of the Chiricahua Mountains, Mrs. Lemmon, born Plumvier. 



Var. alba. Plowers white : leaves less serrate and not so strongly veiny. — S. Arizona, 

 in EauLsey's Canon, Leinmon. 



•i— -i— Shrubby: leaves subsessile, mostly entire and opposite. 



S. Leramoni, Gray. Fmticose, puberulent througliout, leafy up to the den.se clusters of 

 very numerous heads : leaves linear-oblong, obtuse, tliinnish, obscurely tripliuerved : 

 involucre somewhat viscid-pubescent : flowers apparently white : pappus a cu])ulate and 

 nearly entire or merely lacerate crown. — Proc. Am. Acad. 1. c. — S. Arizona, canons in the 

 Santa Catalina Mountains, Lemmon, Prim/Ie. 



S. Salicifolia, Cav. Frutescent, low, nearly glalirous : leaves coriaceous, linear or linear- 

 lanceolate, occasionally serrate, commonly glutinous-lucid: heads in small and more open 

 fascicles: flowers white: pappus 1-3-aristate, or sometimes of obtuse palea3. — Ic. 1. c. 

 t. 354 ; Schultz Bip. 1. c. 290 ; Gray, Bot. Mex. Bound. 73. *S'. angimtifolia, HBK. 1. c. (aAvn- 

 less pappus). — S. border of Texas, Parrj, a low and very narrow-leaved form. (Mex.) 



5. SCLiEROLiEPIS, Cass. ('S.KX.7}f)6<;, hard, and AcTrts, scale, from the 

 cartilaginous paleaj of the pappus.) — Genus of a single species, peculiar to the 

 Atlantic coast. Fl. summer. 



S. verticillata, Cass. Subaquatic perennial, nearly glabrous, stoloniferous from the base: 

 stems slender, usually simple, above the water bearing many whorls of narrowly linear one- 

 nerved entire sessile leaves (half-inch to an inch long), and terminated by a solitary pedun- 

 culate small head (rarely branching at top and 3-4-cephalous) : flowers rose-purple. — 

 Diet. xxv. 365 ; DC. Prodr. v. 114; Torr. & Gray, Fl. ii. 65. uEthuUa uniflora, Walt. Car. 

 195. Spttn/onophorus verlici/latiis, Michx. Fl. ii. 95, t. 42. — Low pine-barren ponds and 

 streams, in shallow water. New Jersey to Florida. Leaves 4 to 6 in the whorls. 



6. TRICHOCORONIS, Gray. (Qptf, rptxo?, hair, and K-opoWc, top or 

 apex.) — Texano-Mexican herbs, fibrous-rooted, aquatic or paludose ; with stems 

 creeping at base or spreading, branching, leafy, pubescent with somewhat viscid 

 and weak multicellular hairs: leaves of soft texture, opposite or the upper alter- 

 nate, sessile and partly clasping, glabrate : heads slender-pedunch'd, terminating 

 the branches : flowers flesh-color or rose-purple. — PI. Fendl. 65 ; Benth. & 

 Hook. Gen. ii. 240. 



T. "Wrigbtii, Gray, 1. c. Stems assiirgent from an annual root, paniculately-branched 

 above : leaves undivided, sparingly serrate, half-inch or more long ; the lower opposite and 

 oblong; upper alternate and cordate-lanceolate: heads diffusely panicled, only two lines 

 high and wide: involiicral bracts about 18, oblong-lanceolate : receptacle convex: tube of 

 the corolla shorter than the expanded throat and limb: style-branches narrow : pappus a 

 minute but evident crown of more or less concreted sctuliform squamellre, or some of them 

 aristellate. — Agendum? (Micrageratum) Wrighdi, Torr. & Gray, Proc. Am. Acad. i. 46. 



