SYNANTHERE^. 375 



36. SALMEA, DC. 



Head discoid, homogamous. Involucre imbricate-2-serial. Receptacle conical, paleaceous. 

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

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

 site ; heads corymbose, white. 



Sect. 1. Eusalmea. — Style-tumour hemispherical: branches devoid of a terminal appen- 

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



111. S. grandiceps, Cass. Glabrous or glabresceut at the top; leaves petioled, ovate 

 or ovate-lanceolate, acuminate, denticulate-repand or subentire ; pedicels 3-5-uate : heads 

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

 ceeded by the flowers ; palese oblong-linear, blunt ; achenium ciliate, obversely lanceolate 

 twice as long as the subequal awns. — Calea Acmellus, L. Bidens scandens, Sw. <non L.) 

 S. scandens, DC. (exclus. syn. Linn!). S. Eupatoria, fi, DC. — Leaves 4"-2", heads 4"'-6'" 

 flowers 2'" long, odorous ; achenium 1 \"' 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 ; palese oblong-linear, bluntish ; awns of the ovary subequal. — Habit of the preced- 

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

 dens, which has broader involucral scales. — Hab. Trinidad !, 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, DC. ? — 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. Hopkirkia. — Style-tumours ovoid : branches with a bluntish, conical appendage. 

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



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

 lanceolate or oblong-lanceolate, acuminate, with a narrow point, denticidate-repand or sub- 

 entire, scabrous-hispidulous above, villous-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 

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

 margined. — Bidens, Sw. I — 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. Stekrhanthemi/M.— Style-tumour hemispherical: branches revolute, with a ter- 

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

 pedicellate, in densely fastigiate corymbs. 



115. S. petrobioides, Gr. (n. 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 Petrobitim ; leaves 1 2" -8'", petiole 2'" long ; corymbs l"-li" diam. : 

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



37. SP1LANTHES, Jacq. 

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



