92 COMPOSITE. Stasia. 



# # # Heads subsessile and fasciculate; the fascicles corymbosely cyinose: 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 

 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 

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

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

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

 HBK. 1. c. S. punctata, Schultz 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. PlummerSB, 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 paleas. — Proc. Am. Acad. xvii. 204. — 

 S. Arizona, Rucker 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— -k- 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 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. 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 pale*. — Ic. 1. c. 

 t. 354 ; Schultz Bip. 1. c. 290 ; Gray, Bot. Mex. Bound. 73. S. angiisti folia, HBK. 1. c. (awn- 

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



5. SCLER6LEPIS, Cass. (2 K \r)p6s, hard, and Actus, 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. 1 14 ; Torr. & Gray, Fl. ii. 65. JEthulia uniflora, Walt. Car. 

 195. Spargonophorus verticillatus, 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, (©pff, T pi X o5, hair, and Kopwws, 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-peduncled, terminating 

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

 Hook. Gen. ii. 240. 



T. Wrightii, Gray, 1. c. Stems assurgent 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 1 8, 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 squamellie, or some of them 

 aristellate. — A geratum? (Micrageratum) Wrightii, Torr. & Gray, Proc. Am. Acad. i. 46. 



