S76 SYNANTHEREJ!. 



cylindrical or conical, paleaceous. Style-tranches truncate, penicillate at the top. Aclienia 

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

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

 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; involncral scales 5 (-6); 

 ray-flowers subincluded ; achenium nakedy or with 2 minute bristles^ ciliate. — S. tenella an^d 

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

 long.— Hab. Jamaica !, all coU., common in moist places ; Antigua 1, Wwllschl. ; Trinidad 1, 

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



117. S. exasperata, Jaiq. Annual, virgate, scabrous-puberulons or glabrescent i 

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

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

 scales 5 ; achenium ahorth/ 2-at6tied, ciliate. — Jaeq. Ic. Bar. t. 584. — Scarcely to be dis- 

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

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



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

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

 tary, subglobose, at length bluntly conical, discoid ; i^ceptacle conical-cylindrical ; involu- 

 cral scales 3-serial, 6-7 ; achenium 8-awned, ciliate : awns unequal, the longer hispidulous, 

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

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



5. oleracea, Jacq. (Dpsc. Fl. 1. 1. 53), a discoid species, with ovate, petioled leaves, and 

 12-20 involucral scales, is only cultivated in Jamaica !, Baiter. 



38. ISOCAEPHA, R. Br. 

 (Dunantia, BO.) 



Mead discoid. Involucre replaced by the exterior paleee or incomplete. Receptacle 

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

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

 opposite, or the superior alternate ; beads 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 base. Palete rigid, Z-S -nerved. — 



Leaves opposite. 



119. I. oppositifolia, S. Br. Virgate, pubescent ; leaves sessile, lanceolate, bluntish, 

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

 tacle shortly conical-cylindrical ; palese mucronate, exterior often fertile ; appendages of the 

 style-branches setaceous; achenium glabrous. — Calea, L., Sv>. — 2' high; heads S™-*'" 

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

 Jamaica !, Macf., Pd., K^ils., on the seacoast {Pd.), in the hills {Sw.) ; Trinidad !, Lockh., 

 on gravelly banks. 



120. I. angiistata, Gr. (a. sp). Branched, pubescent, with scattered hairs ; leaves 

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

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

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

 nate, exterior sterile, green; appendages of the style-hranches thicUsh-jiliform, pointed ; 

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

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

 3'" long : palcffi-nerves as in the preceding.— Hab. Jamaica 1, At., near the cascade of 

 Fall's river. 



