92 COMPOSITJE. Stevia. 



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

 -4— 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 

 spatulate-linear 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 

 i'n some flowers reduced to a crown of short obtuse pale^. — Ic. iv. t. 355 ; DC. Prodr. v. 

 118. S. ivafolia, Willd. Mag. Naturf. Berl. 1807, 137, & Enum. 855. .S'. canescens, HBK. 

 Nov. Gen. & Spec. iv. 143; Benth. PI. plartw. 19; Gray, PL Wright, ii. 71. S.virgata, 

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

 Schcenbr. iii. t. 300. (Variable species.) — New Mexico and Arizona, Wright and later 

 collectors. (Mex., Venezuela.) 



S. Plummerse, Ghat. 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 palese. — Proc. Am. Acad. xvii. 204. — 

 S. Arizona, Rucker Valley of the Chiricahua Mountains, Mrs. Lemmoii, born Phimmer. 



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

 in Eamsey's CaFion, Leiiimon. 



^— -1— Shrubby: leaves subsessile, mostlj- entire and opposite. 



S. Lemmoni, Gkay. Pruticose, puberulent throughout, leafy up to the dense clusters of 

 very numerous heads : leaves linear-oblong, obtuse, thiunish, obscurely 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, Pringle. 



S. salicifolia, Cav. Prutescent, 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 palese. — 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 Te.xas, Parry, a low and very narrow-leaved form. (Mex.) 



5. SCLEROLEPIS, Cass. ('S.KX.rjpo?, hard, and A.e7ris, scale, from the 

 cartilagiijDus palese of the pappus.) — Genus of a single species, peculiar to the 

 Atlantic coast. Fl. summer. 



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

 stems slender, usually simple, abo\ e the water bearing many whorls of narrowlv linear one- 

 nerved entire sessile leaves (half-incli 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, Fh ii. 65. .Etlndia mljiora, AValt. Car. 

 195. SjiargiiNophorus verlicillatus, Michx. Fl. ii. 95, t. 42. — Low pine-barren ponds and 

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



6. TRICHOCOR6NIS, Gray. (&pii, rpixo's, hair, and Kopavl^, top or 

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

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

 and \ve:ik multicellular hairs : leaves of soft texture, opposite or the upper alter- 

 nate, sessile and partly ehisping, glabrate : heads slender-peduuchMl, terminating 

 the branches : flowers flesli-color or rose-purple. — PL Fendl. Go ; Benth. & 

 Hook. Gen. ii. 240. 



T. Wrightii, Gray, 1. c. Stems assurgent from an annual root, paniculatelv-branched 

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

 olilong; upper alternate and cordate-lanceolate: heads diffusel)- panicled, onh- t^o lines 

 high and wide: involucral liraits about 18, oblong-l;uiceoliite : receptacle convex: tube of 

 the corolla shorter than the expanded throat and limb : style-branches n.trrow : papinis a 



mirmte but evident crown of more or less c ereted setuliform s,|uamelhv, or .■ioine of them 



aristeUate. — %<!raiM!)i ? (MicragL'ruium) ]rn'glilll,Toii: & Gray, Proc' Am. Arad. i. 46. 



