356 SYNANTHBREJ!. 



9. AGERATUM, L. 



Head discoid. Involucre imbricate. Ueeeptacle conical, naked. CoroUce clavate. Ache- 

 nium 5-goual: pappus of 5-10 distinct scales. — ^Annual herbs; heads in terminal corymbs, 

 blue or white. 

 *''^18. A. conyzoides, L. Erect; leaves ovate, obtusely serrate, petioled: pairs distant; 

 "^ .involucral scales striate; pa/pjms-scales 5, subulate-setaceous, subserrate at the dilated base, 

 ■* nearly as long as the achenium. — SI. t. 152./. 2. — ^A variable weed; leaves 2"-l" long. — 

 Hab. Jamaica!, March; S.Kitts!, ^/j., Antigual, TF«//scA;., Dominica !, Imr., S.Vin- 

 cent!, Guild.; [Georgia and Cuba! to Brazil!; Pacific Islands!; East Indies!; trop. 

 Africa! to Natal!]. 



19. A. muticum, Gr. Erect ; leaves ovate, serrate, petioled : pairs distant ; involncraj 

 scales striate ; 'pappus-scales 5, lanceolate, bluntish, ciliate, one-third as long as the achenium 

 (rarely one of them longer and acuminate). — A. maritimum, j8, Schultz JBip. in PI. Lechl. 

 (non Kth.). — Exactly like the preceding, but apparently constant in its awnless pappus, the 

 scales of which are distinct to the base. — Hab. Jamaica!, Wullschl., March; [Cuba!, 

 Peru !]. 



10. ADENOSTEMMA, Forst. 



Head discoid. Involucre nearly 1-serial. Receptacle convex, naked. Corollce dilated 

 above. Achenium clavate : pappus of 2-5 rigid bristles, which are crowned with a gland. — 

 Herbs ; heads in terminal corymbs, white. 



20. A. Sirartzii, Cass, Annual ; stem ascending from a radicant base ; leaves deltoid 

 or rhomboid-oval, serrate above the base, glabreseent; corymb few-headed ; involucral scales 

 spathulate, glabreseent, ciliate above; corolla abruptly dilated, villous above; achenium 

 obliquely clavate, hanging from a short, narrow base, slightly muricate; pappus-bristles 

 3 (-4) : gland clavate. — SI. t. 155./. 2. — Cotula Verbesina, L. Lavenia deeumbens, Sw. — 

 8"-l' high ; leaves 8"'-2", achenium 2'" long. — Hab. Jamaica I, Macf., Wils,, rare in moist 

 woods, at 3000' alt.; S. Vincent!, Guild.; [Cuba!, Ecuador!]. 



11. BRICKELIA, m. 



^ Head discoid. Involucre imbricate: scales striate. Ueceptacle flat, naked. Corolla 

 filiform : teeth minute. Style with a hispid tumour at the base : branches glabrous, clavate, 

 or slender. Achenium cylindrical, 10-striate; pappus pilose. — Slender, suffi-uteseent herbs; 

 heads in leafy panicles. 



The West Indian species of this genus has a less imbricate involucre, a soft, not scabrous 

 pappus, and filiform, slightly bluntish style-branches. 



^ 31. B. diffusa, As. Gr. Glabrous; stem herbaceous, cylindrical, many-branched; 

 leaves opposite, membranaceous, petioled, cordate-deltoid, slightly cuneate at the base, serrate 

 above it, those of the large loose panicle lanceolate or linear ; pedicels capillary, in coiymbs ; 



Clinvolucral scales sub-^-serial, exterior small, imbricate, interior much longer, oblong-linear, 

 bluntish; heads 12-6-flowered; achenium puberulous or glabrate : pappus capillary, soft. — 

 Eupatorium, V. Bulbostylis, i)C.— Erect, 2'-4' high; panicle l'-2'long: heads number- 

 less, 3'" long.— Hab. Jamaica !, Macf., Pd., Al., March, in woods, S. Andrews, Vfestmore- 

 laud ; Trinidad !, Lockh. ; [IMexico, Veraguas !, Venezuela !, Brazil !]. 



12. HEBECLINIUM, BC. 



Head discoid. Involucre Imbricate : scales striate. Receptacle convex, shortly pilose. 

 Coroll,^ filiform: teeth mmute, cfliate. Style equal at the base. Achenium 2-3-angular, 

 suhcompressed : pappus pilose.— Pubescent herbs ; h.e!Aa numerous, in contracted, terminal, 

 and axillary corymbs. 



^^- "• macfophyllum, I)^ Suffrutescent, softly puberulous; leaves subcordate- 



, roundish or de toid, pointed, shghtly euueate at the base, crenate, petioled ; corymbs roundish 



or lobed : heads many -flowered ; involucral scales puberulous, blunt, exterior ovate, interior 



longer, lanceolate; achenium glabrous.— Eupatorium, Z. E. populifolium, ilf«)-<. Ageratum 



