356 SYNANTHERILE. 



9. AGERATUM, L. 



Head discoid. Involucre imbricate. Receptacle conical, naked. .Corolla 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 ; pappus-scales 5, subulate-setaceous, subserrate at the dilated base, 

 nearly as long as the achenium. — SI. t. 152. f. 2. — A variable weed; leaves 2"-l" long. — 

 Hab. Jamaica!, March; S. Kitts !, Els., Antigua!, Wullschl., 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 ; involucral 

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

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

 (no/i 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. Corolla dilated 

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

 Herbs ; heads in terminal corymbs, white. 



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

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

 spathulate, glabrescent, 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 decumbens, Sw. — 

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

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



11. BRICKELIA, Ell. 



Head discoid. Involucre imbricate: scales striate. Receptacle 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, suffrutescent 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. 



21. 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 corymbs ; 

 involucral scales sub-2-serial, exterior small, imbricate, interior much longer, oblong-linear, 

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

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

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

 land ; Trinidad !, Lockh. ; [Mexico, Veraguas !, Venezuela !, Brazil !]. 



12. HEBECLINIUM, DC. 



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

 Corolla filiform : teeth minute, ciliate. Style equal at the base. Achenium 2-3-angular, 

 subcompressed : pappus pilose. — Pubescent herbs ; heads numerous, in contracted, terminal, 

 and axillary corymbs. 



22. H. macrophyllum, DC. Suffrutescent, softly puberulous ; leaves subcordate- 

 ronndish or deltoid, pointed, slightly cuneate at the base, crenate, petioled ; corymbs roundish 

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

 longer, lanceolate ; achenium glabrous. — Eupatorium, L. E. populifolium, Mart. Ageratum 



