ASTERACEjE. 



SPILANTHES. 



Head many-flowered ; either heterogamous, with the florets of 

 the ray ligulate, ? , usually small ; or homogamous with all the 

 florets <g, tubular, 4-5-toothed. Involucre in 2 rows, appressed, 

 shorter than the disk ; the outer scales somewhat leafy ; the 

 inner rather membranous and folded up. Branches of the style 

 in the <f truncate and pencilled at the apex. Anthers blackish. 

 Achaenia of the disk compressed, not beaked, usually ciliated at 

 the sides or not aristate ; of the ray, when there is any, trique- 

 trous or obcompressed. DC. 



923. S. oleracea Jacq. hort.vind. ii. t. 135. DC.prodr.\.Q2^. 

 — Bidens fervida Lam. diet. i. 415.— Para and other parts of 

 South America. 



Stem branched, diffuse. Leaves opposite, stalked, broadly ovate, 

 obtuse at the base, truncate or somewhat cordate, repand-toothed. 

 Pedicels 1-headed, longer than the leaf. Heads thick, ovate, discoidal. 

 Involucral scales 15-16, oval-oblong. Achaenia ciliated at the angles 

 biaristate, or awnless. — The whole plant, but especially the involucre 

 and receptacle, act as a powerful stimulant of the salivary organs. 



CALEA. 



Head many-flowered, either homogamous or radiant. Ray $ . 

 Involucre ovate, or occasionally campanulate ; scales imbricated, 

 usually obtuse and dry. Receptacle more or less conical, palea- 

 ceous. Branches of the style in the cf without appendages. 

 Acha?nium taper, compressed, or angular. Pappus of 5-20 paleae, 

 usually of about 10, linear-lanceolate, scarious, acuminate, 1- 

 nerved, nearly equal. DC. 



924. C. jamaicensis Linn. sp. 1 179. Sxcartz.fi. ind. occ. 1327. 

 DC. prodr. v. 672. — {Shane i. 257. t. 151. f. 3.)— Westlndia 

 Islands. (Halbert weed.) 



A shrub, with round, lax, downy branches. Leaves stalked, ovate, 

 acuminate, subserrated, 3-nerved, scabrous on the upper side, hairy on 

 the under. Heads pedicellate, about 3 at the end of the branches, 

 ovate, discoidal. Involucral scales ovate, hairy externally ; paleas lan- 

 ceolate. Paleas of the pappus serrated. DC. — The leaves contain a 

 powerful bitter, and, steeped in wine or brandy, form a stomachic 

 medicine in the West Indies. Linncea ix. 512. It is, however, not 

 certain that this account does not rather apply to Neurol&na lobata, 

 RBr., the Caleaa lobata Swartz. 



ANTHEMIS. 



Head many-flowered, heterogamous. Florets of the ray in 1 

 row, ligulate, J , (rarely 0, or somewhat tubular) ; of the disk 5", 

 tubular, 5-toothed. Receptacle convex, oblong or conical ; covered 

 with membranous paleas between the flowers. Involucre imbri- 



458 



