SYNANTHERE^. 377 



Sect. 2. Spilanthodia. — Heads ovoid, at length conical. Pale<B membranaceous. — 

 Leaves all, or superior alternate. 



121. I. atripUcifolia, U. Br. Stem erect, branched, acabroiis-puberulous, and gla- 

 brescent; leaves ovate or lanceolate, serrate, arch-veined, glabrous, contracted into the 

 petiole, which is auricled at the base : usually most alternate ; heads single, numerous ; re- 

 ceptacle conical-cylindrical ; palese 1 -nerved, exterior sterile ; appendages of the style- 

 branches setaceous ; achenium pubescent. — Spilanthea, i. I. Billbergiana, Zess., is perhaps 

 an opposite-leaved form, with the uppermost leaves alternate : such a form occurs in Tri- 

 nidad, together with the alternate-leaved one.— 1'-3' high; heads 4'" long, somewhat 

 pointed. — Hab. Trinidad I, Lockh., Cr., in u^oist savannahs; [Cuba!; New Granada], 



39. SYNEDRELLA, G. 



Bead radiate ; the ray-flowers ? : disk 5-12-flowered. Involucre few-leaved, foliaceous. 

 Receptacle minute, paleaceous. Style-branches with a hispidulous setaceous appendage. 

 Achenia of the ray compressed, winged, with the wing cut into flattish spines, of the disk 

 linear, flat-convex, sub-3-angular, tubercled, 2(-3)-awned. — ^A diffuse, annual herb; leaves 

 opposite J heads subsessile, glomerate-geminate in the axils, yellow. 



122. S. nodiflora, G. — SI. t. 154. y. 4. — Verbesina, L. — Stem pubescent or glabrate ; 

 leaves ovate, triplinerved, pointed, cuneate at the petioled base, serrulate or subentire ; heads 

 4'" long. — Hab. Jamaica !, all coll., a common weed ; Antigua I, Wullschl., Dominica !, 

 Imr., S. Vincent !, Guild. ; Trinidad !, Sch. ; [Cuba ! and Mexico ! to Guiana ! and PeruP]; 



40. CHRYSANTHELLUM, Moh. ■ 



Mead radiate : ray-(flowers $ . Involucre 2-1 -serial. Receptacle flat, paleaceous. Style- 

 branches shortly conical, hispidulous. Achenia of the ray cylindrical, callous, 8-furrowed 

 on each side, of the disk compressed, narrowly winged, with the wing dentate-ciliate, or all 

 compressed, naked. — Diffuse, annual, glabrous herbs ; leaves alternate, lowest rosulate ; 



% 



^^ 123. C. procumbens, Rich. Leaves cuneate, serrate, or cut, inferior petioled ; ray- 

 flowers 10-12, disk few-flowered ; achenia of the ray cylindrical, of the disk compressed. — 

 SI. t. 155./. 3. Sw. Obs. t. 8./. 1. — C. Swartzii, Less. Verbesina inutioa, L., Sw. An- 

 themis americana, L. — Procumbent ; heads small. — Hab. Jamaica !, Saner., Macf., Dist., 

 M'Nab, Wiillschl., in pastures, uncommon ; [Cuba I to Brazil I]. 



Subseries 3. Tagetinese. — Di^lc-flowers hermaphrodite. Receptacle nailed, flat. — Leaves 

 dotted with large, pellucid glands, 



* 



41. PECTIS, L. 



Head radiate : ray-flowers § , Involucre 1-serial. Corolla of the disk often unequally 

 5-dentate. Style hispidulous above and along its short branches. A ehenium filiform, striate, 

 tapering at the base . pappus of scales, which usually are produced into awns, or of awns, or 

 of scabrous bristles.— Herbs, usually annual; leaves opposite, \-nerved, often fringed with 

 bristles towards the base ; heads slender, yellow. 



Sect, 1. Pbctidium, Less.— Pappus of a few, spreading, glabrous awns. 

 124 P punctata, Jacq. Annual, glabrous, slender, diohotomously branched above ; 

 leaves'linear, acuminate at both ends, dotted beneath, smooth on the mai'^n : bristles few 

 at their base, short, or none ; heads long pedicellate ; involucral scales 5 (-4), linear, blunt, 

 dotted with Hnear, black glands ; ray 5-, disk few-flowered ; achenium hispidulous above ; 

 awns 2-4, subuliform.-Jacq. Amer. Fict. t. 196. SI. t. 149./. 3. Lam. Illt.%%4..-- 

 P Hnifolia, L. (ex ic. SI. and Lam. : non Less.). Pectidium punctatum, im.— 1-3 high ; 

 leaves l"'-a"' broad.— Hab. Jamaica!, aU coU., along, the sandy seacoast; [Cuba! to 

 French islands ; Venezuela I ; Galapagos !]. 



