376 SYNANTHEREJI. 



cylindrical or conical, paleaceous. Style-branches truncate, penicillate at the top. A chenia 

 of the disk compressed, often with a ciliate margin, of the ray compressed-angular, all naked 

 or crowned with 2 (1-3) awns or bristles. — Herbs; leaves opposite; heads long-pedun- 

 cled. 



116. S. uliginosa, Sw. Annual, diffuse, glabrescent ; leaves ovate-lanceolate, lanceo- 

 late or ovate, creuulate-repand, triplinerved, contracted or tapering at the petioled base ; 

 heads ovoid, at length conical, radiate ; receptacle cylindrical ; involucral scales 5 (-6) ; 

 ray-flowers subincluded ; achenium naked, or with 2 minute bristles, ciliate. — S. tenella and 

 debilis, Kth. S. Salzmanni, DC. — Bay white : achenium black, with a white margin, £'" 

 long. — Hab. Jamaica !, all coll., common in moist places ; Antigua I, Wullschl. ; Trinidad !, 

 Sch., Cr. ; [French islands ! ; Mexico ! to Peru ! and Brazil !]. 



117. S. exasperata, Jacq. Annual, virgate, scabrous-puberulous or glabrescent ; 

 leaves ovate or lanceolate, crenulate or repand, triplinerved, contracted or tapering at the 

 petioled base ; heads conical, discoid (rarely radiate) ; receptacle cylindrical ; involucral 

 scales 5; achenium shortly 2-awned, ciliate. — Jacq. Ic. Bar. t. 584. — Scarcely to be dis- 

 tinguished from the preceding, but the achenia V" long, and with longer awns. — Hab. S. 

 Vincent!, Guild.; Trinidad!, Cr.; [Panama! to Guiana!]. 



118. S. urens, Jacq. Perennial, glabrescent; branches ascending from a radicant base; 

 leaves lanceolate (or linear), quite entire, tapering towards the subsessile base ; heads soli- 

 tary, subglobose, at length bluntly conical, discoid ; receptacle conical-cylindrical ; involu- 

 cral scales 2-serial, 6-7 ; achenium 2-awned, ciliate : awns unequal, the longer hispidulous. 

 — Jacq. Amer. Pict. t. 194. — Heads white, larger than in the preceding, 4'" diam. — Hab. 

 S. Vincent!, Guild., on the seashore ; [Haiti ! ; New Granada, Peru !, Brazil !]. 



S. oleracea, Jacq. (Desc. Fl. 1. t. 52), a discoid species, with ovate, petioled leaves, and 

 12-20 involucral scales, is only cultivated in Jamaica I, Bancr, 



38. ISOCARPHA, R. Br. 

 (Dunantia, DC.) 



Head discoid. Involucre replaced by the exterior paleae or incomplete. Receptacle 

 cylindrical or conical, paleaceous. Anthers yellow. Style-branches with a hispidulous, fili- 

 form, or bluntish appendage. Achenium tetragonal, naked. Suffrutescent herbs ; leaves 

 opposite, or the superior alternate ; heads glomerate or single, peduncled, whitish. 



The difference of setaceous or bluntish appendages of the style is apparently of no great 

 value, though from the habit two sections may be distinguished, one resembling Spilanthes 

 (and including I. divaricata, Benth.), the other identical with Dunantia : to the latter 1 

 refer a Mexican plant, agreeing with I. echioides, Less. 



Sect. 1. Dunantia, DC — Heads turbinate at the ba%e. Paleee rigid, 2-3 -nerved. — 



Leaves opposite. 



119. Z. oppositifolia, R. Br. Virgate, pubescent ; leaves sessile, lanceolate, bluntish, 

 triplinerved, subentire ; heads temately subsessile ; peduncles long, 3-fid or simple ; recep- 

 tacle shortly conieal-eylindrical ; paleee mucronate, exterior often fertile ; appendages of the 

 style-branches setaceous; achenium glabrous. — Galea, L., Sw. — 2' high; heads Z"-^"' 

 long ; palea-nerves thickish, contiguous along the middle line. — Hab. Bahamas !, Swains. ; 

 Jamaica !, Mac/., Pd., fPils., on the seacoast {Pd.), in the hills {Sw.) ; Trinidad !, Lockh., 

 on gravelly banks. 



120. X. angustata, Gr. {n. sp.). Branched, pubescent, with scattered hairs ; leaves 

 oblong-lanceolate, bluntish, quite entire, triplinerved above the long, contracted base, 

 which often tapers into a short petiole ; heads single (—geminate) : peduncle about as long 

 as the uppermost leaves ; receptacle shortly conical-cylindrical ; paleae 2-3-nerved, mucro- 

 nate, exterior sterile, green ; appendages of the style-branches thickish-filiform, pointed ; 

 achenium glabrous. — Spithameous ; leaves (the petiolar base included) 1'' long, 3"'-4'" 

 broad, contracted from the middle or below it, les3 pubescent than in the preceding ; head 

 3" long: palese-nerves as in the preceding. — Hab. Jamaica!, Al., near the cascade of 

 Fall's river. 



