92 COMPOSITE. Stevia. 



* * * Heads subsessile and fasciculate; the fascicles coiymboscly cymose: root perennial, 

 i Herbaceous, leafy up to the dense fastigiate clusters of heads: leaves subsessile, serrate. 



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

 spat ulate-lirj ear 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 palea;. Ic. iv. t. 355 ; DC. Prodr. v. 

 118. S. ii'trfo/in, Wilkl. Mag. Naturf. Berl. 1807, 137, & Euuin. 855. S. canescens, IIBK. 

 Nov. Gen. & Spec. iv. 143; Beuth. PL Ilartw. 19; Gray, PL Wright, ii. 71. S. vinjata, 

 HBK. 1. c. S.punctata, Sclmltz Bip. in Linn. xxv. 286. Ai/eraftnn pnnctutnin, Jacq. Hort. 

 Schoenbr. iii. t. 300. (Variable species.) New Mexico and Arizona, Writ/fit aud later 

 collectors. (Mex., Venezuela.) 



S. PlutnrnerSB, GRAY. Pubemlent and almost glabrous: leaves nearly all opposite, less 

 crowded, oblong-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 aud truncate fimbriate-denticulate palea>. Proc. Am. Acad. xvii. 204. 

 S. Arizona, Rucker Valley of the Chiricahua Mountains, Mrs. Lciinnon, boru Plummer. 



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

 in Ramsey's CaTiou, Lcmmon. 



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



S. Lemmoni, GRAY. Fruticose, puberulent throughout, leafy up to the dense clusters of 

 very numerous heads : leaves linear-oblong, obtuse, thinnish, obscurely triplinerved : 

 involucre somewhat viscid-pubescent: flowers apparently white: pappus a cupulate aud 

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

 Santa C'atalina Mountains, Lemmon, Primjlc. 



S. salicifolia, CAV. Frutescent, low, nearly glabrous : 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 palea;. Ic. 1. c. 

 t. 354 ; Schnltz Bip. 1. c. 290 ; Gray, Bot. Mex. Bound. 73. <$. anytistifolia, HBK. 1. c. (awn- 

 less pappus). S. border of Texas, Parry, a low aud very narrow-leaved form. (Mex.) 



5. SCLEB6LEPIS, Cass. (2 K X7/po?, hard, and AeTrts, scale, from the 

 cartilaginous palese 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. ^Etlntlia uuijiora, Walt. Car. 

 195. Spargonophorus vcrtici/latns, 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. TRICHOCOR6NIS, Gray. ( p , T P i X <>s, hair, and KopcmV, top or 

 apex.) Texano-Mexican herbs, fibrous-rooted, aquatic or paludo.se ; 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, glabrnte : heads slender-peduncled, terminating 

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

 Hook. Gen. ii. 240. 



T. "Wrightii, GRAY, 1. c. Stems assnrgent 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: involucral 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 setuliform squamellae, or some of them 

 aristellate. Ageratum? (Micrageratum) Wrighlii, Torr. & Gray, Proc. Am. Acad. i. 46. 



