SYNANTHERE^. 375 



86. SALMEA. JDC. 



Bead discoid, homogamous. Involucre imbricate-3-serial. Seceptacle conical, paleaceous. 

 Anthers bimucronate at the base. Style with a basilar tumour : branches puberulous, with 

 a blunt point. Achenium. vertically compressed, 2-awned. — Trailing shrnbs; leaves oppo- 

 site ; heads corymbose, white. 



Sect. 1. EusALMEA.' — Style-tumour hemispherical ; branches devoid of, a terminal apperL- 

 'dage, blunt. Avms of the achenium wingless. — Heads pedicellate, single in the corymbs. 



111. S. grandiceps, Cass. G^airoa* or glabresceut at the top ; leaves peiioled, ovate 

 or ovate-lanceolate, acuminate, denticulate-repand or subentire ; pedicels 3-B-nate : heads 

 rhomboid-conical; involucre 2-3-serial; scales ovate or ovate-oblong, interior longer, ex- 

 ceeded by the flowers ; paleee oblong-liuear, blunt ; achenium ciliate, obversely lanceolate, 

 twice as long as the subeqaal awns. — Galea Aomellus, L. Bidens scandens, Sw. fnon L.). 

 S. scandens, DC. (exclus. syn. lAnn^. S. Eupatoria, ft DC. — Leaves 4"-2", heads 4"'-6"', 

 flowers 2"' long, odorous ; achenium 1 J'" long. — S. scandens, R. Br. {Bidens, L. S. par- 

 viceps, Cass. Bot. Mag. t. 2062), is a .continental species (Mexico !, Panama !, Brazil !), 

 distinguished by smaller (2'" diam.), hemispherical heads and shorter flowers. — Hab. Ja- 

 maica!, Macf, Al., Pd., Wils., March, in the mountains; [Cuba!, Haiti !, Portorico !]. 



112. S. oppositiceps, Cass. Glabrous, puberulous at the top; leaves petioled, ovate 

 or ovate-lanceolate, acuminate, denticulate-repand; pedicels' 3-5-nate : heads oblong, blunt- 

 ish at the base ; involucre 2-3-serial : scales ovate, interior oblong, longer, exceeded by the 

 flowers ; palesB oblong-linear, bluntish ; awns of the ovary subequal. — Habit of the preced- 

 ing, but heads 2'" long, scarcely V" thick, flowers IJ'" long, less numerous than in S. scan- 

 dens, which has broader involucral scales. — Hab. Trinidad I, Cr. 



113. S. sessilifolia, Gr. Rusty-villous ; leaves subsessile, ovate, acuminate, den- 

 ticulate-repand ; corymbs loose : heads hemispherical ; involucre 3-serial : scales ovate- 

 roundish ; palese oblong-linear, excurrent at the summit into a broader, roundish appendage ; 

 awns of the ovary unequal, or one of them abortive. — S. Eupatoria, a, BC.i' — A trailing 

 shrub : leaves 4"-2" long, broadly rounded at the base : down more scattered than on the 

 branches and corymbs ; heads 2'" diam. — Hab. Jamaica !, Pd., Westmoreland, 



Sect. 2. HoPKiEKiA. — Style-tumours ovoid : branches with a bluntish, conical appendage. 

 Awns of the achenium unequal, winged. —Heads glomerate in the corymbs. 



114. S. hirsuta, SO. Branches striate, villous-pubescent ; leaves petioled, ovate- 

 lanceolate or oblong-lanceolate, acuminate, with a narrow joint, denticulate-repand or sub- 

 entire, scabrous-hispidulous above, viUous-tomentose beneath ; corymbs trichotomous : heads 

 ternately subsessile, oblong ; involucre 2-3-serial : scales ovate-oblong or oblong-lanceolate, 

 interior half as long as the flowers and exterior palese ; palese oblong, acuminate ; achenium 

 enneate-linear : longer awn externally winged, with the wing shortly decurrent, shorter 

 margined. — Bidens, Sw. 1 — Leaves 5"-3" long; heads 10-15-flowered, 3'"-4"' long. — Hab. 

 Jamaica !, Sw., Macf., Al., Pd., Wullschl., in the mountains, S. Anns, Manchester. 



Sect. 3. Steebhanthemum. — Style-tumour hemispherical: branches resolute, with a ter- 

 minal, subglobose appendage. Awns of the achenium wingless, egual. — Heads shortly 

 pedicellate, in densely fastigiate corymbs. 



115. S. petrobioides, Gr. (». sp.). Glabrous; leaves somewhat fleshy, petioled, 

 obovate or oval, mucronulate, quite entire ; corymbs terminal, short, trichotomous : heads 

 obconical-oblong, truncate ; involucre 2-serial : inner scales oblong-linear, half as long as 

 the exterior palese, exterior loose, minute, ovate, pointed ; palese oblong, pointed ; achenium 

 obovate-cuneate, glabrous, ciliate at the top, twice as long as the awns.— A tortuous, branched 

 shrub, resembling Petrobium ; leaves 12"'-8"', petiole 2'" long ; corymbs l"-li" diam. : 

 heads densely aggregate, 2'" long, 8-12-flowered.— Hab. Bahamas !, Swains. 



37. SPILANTHES, Jacq. 

 Head discoid or shortly radiate : the ray-flowers ? . Involucre 1-2-serial. Receptacle 



