92 COMPOSIT.E. Stevia. 



* * * Heads subsessile and fasciculate; the fascicles corymboscly cymose: root perennial. 

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



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

 spatuliite-Iinear to obloug-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 fiowers reduced to a crown of short obtuse paleffi. — Ic. iv. t. 355 ; DC. Prodr. v. 

 118. S. ivcefoUa, Willd. Mag. Naturf. Berl. 1807, 137, & Euum. 855. .S'. canescens, HBK. 

 Nov. Gen. & Spec. iv. 143; Beuth. PL Hartw. 19; Gray, Ph Wright, ii. 71. S. virrjuta, 

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

 Schnenbr. iii. t. 300. (Variable species.) — New Mexico and Arizona, Wricjht and later 

 collectors. (Mex., Venezuela.) 



S. Plummerae, Gray. Puberulent 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 and truncate fimbriate-denticulate paleae. — Proc. Am. Acad. xvii. 204. — 

 S. Arizona, Bucker Valley of the Chiricahua Mountains, Mrs. Lemmon, born Plummer. 



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

 in Ramsey's Carion, Lemmon. 



■i— -i— Shrubby: leaves subsessile, mostl}^ entire and opposite. 



S. Leminoni, Gray. Fruticose, puberulent throughout, leafy up to the dense clusters of 

 very numerous heads : leaves linear-oblong, obtuse, thinnish, ob.scurely triplinerved : 

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

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

 Santa Catalina Mountains, Lemmon, Primjle. 



S. salicif olia, Cav. Frutescent, low, uearlv glabrous : leaves coriaceous, linear or linear- 

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

 fascicles: flowers white: pappus l-3-ari,state, or sometimes of obtuse palea?. — Ic. 1. c. 

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

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



5. SCLiEROLEPIS, Cass. (2kA.7;po§, hard, and AeTris, scale, from the 

 cartilaginous palea? 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. ^EthuUa vniflora, Walt. Car. 

 195. Spanjonophorus verlicillatits, 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. (0ptf, rpixo's, hair, and kopoW?, top or 

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

 creeping at base or spreading, branching, leafy, pi;bescent with somewhat viscid 

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

 nate, sessile and partly clasping, glabrate : heads slender-peduncled, terminating 

 the branches : flowers flesh-color or rose-purple. — PI. Feudl. 6o ; Benth. & 

 Ilook. Gen. ii. 240. 



T. W^rightii, Gray, 1. c. Stems assurgent from an annual root, paniculately-branched 

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

 oblong ; upper alternate anil 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 squamelhv, or some of them 

 aristellate. — Ageratum? (Micrugeratum) Wrighlil, Torr. & Gray, Proc. Am. Acad. i. 46. 



