366 SYNANTHEEE^. 



17. BACCHARIS, L. 



Beads discoid, dioecious ( ? sometimes with a few central $ ; <? with a few peripherical 

 ? flowers). Involucre imbricate. Receptacle naked. Corolla $ dilated above, ? fili- 

 form. Anthers tailless. Achenium costate : pappus pilose. — Shrubs, rarely herbs, often, 

 resinous ; flowers whitish, or yellow. 



* Branches leafy, wingless ; leaves S-triplinerved. 



70. B. speciosa, i)(7. Glabrous; iranches cylindrical ; leaves elliptical or elliptical- 

 ollong, mucronate, tapering into a short, clasping petiole, S-nerved and loosely reticulated- 

 veiny, entire ; heads hemispherical, in a contracted, fastigiate coiymb ; peduncles angular ; 

 involacral scales in both sexes ovate-roundish, ciliate, exterior mucronulate ; achenium gla- 

 bresceut; pappus rusty, in ? uniserial.— 6'-8' high; leaves 5"-3" long, 20"'-15"'broad; 

 heads 3'" diam. — Hab. Dominical, Imr., in the mountains; [Guadeloupe]. 



71. B. nervosa, DC! Glabrous, somewhat leprous; branches striate-stibangular, 

 virgate ; leaves rigid, ovate-lanceolate or lanceolate, acuminate, acute at the base, shortly 

 petioled, S-nerved, or slightly triplinerved, »«»/««« above, entire; corymbs several(-few)- 

 headed, in a spreading panicle : heads hemispherical, involucral scales ovate and oblong-lan- 

 ceolate, blnntish or blunt, ciliate. — Bupatorium, Sieb. Tr. 76 {non Sw.). — Habit of B. 

 rhexioides, Kth.' leaves 3"-l" long, ia"'-3"' broad; heads 2'" diam.— Hab. Trinidad I, 

 ^eb,, Loekh., Or.; [Guadeloupe; Costarica]. 



** Branches leafy, wingless ; leaves \-nerved. 



72. B. dioica, V. Glabrous ; branches cylindrical, angular above ; leaves leathery, ob- 

 lanceolate or obovate, bluntish, mucronulate or retuse, shortly petioled, l-nerved, entire, 

 punctate beneath : veins inconspicuous, or 2-4 longer ones from near the base ; corymbi- 

 ferous branches nearly fastigiate : heads turbinate-cylindrical, pedicellate ; involucral scales 

 oblong-lanceolate, bluntish, glabrous, exterior ovate ; achenium glabrous : pappus pale-rnsty, 

 in ? l-serial.— FaA^, Symb. t. 74.— B. Vahlii, iJC— Leaves 8"'-2J" long, 5"'-6"' broad; 

 heads 2'" long. — Hab. Bahamas I, Swains., Turk Islands !, Hjahnars. ; Jamaica !, Pd,, 

 M'Nab; Montserrat; [S. Croix, Desirade I]. 



73. B. myrsiuites, Pers. Puberulous above, early glabrous; branches cylindrical, 

 angular above; leaves rigid, elliptical-lanceolate, elliptical-oblong or lanceolate, sharply 

 acuminate or cuspidate, acute at the base, shortly petioled, or subsessUe, \-nerved, few-ser- 

 rulate or snbentire, punctate beneath : veins equal, pinnate, inconspicuous above ; heads iu 

 coufflacted corymbs, subsessile-glomerate, ovoid-cylindrical ; involucral scales ovate and 

 ovate-oblong, bluntish, ciliate, puberulous, glabrescent. — Conyza, Lam. — Leaves 2"-l" long, 

 6"'-8"' broad ; heads 3'" long. — Hab. Jamaica !, Pd., M'Nab, in pastures, S. Thomas i. E. ; 

 [Haiti]. 



*** Branches wingless, subaphyllous. 



74. B. Bcoparia, Sw. Glabrous; branchlets slender, rigid, densely approximate, 

 broom-Hie, tetragonal, subaphyllous, viscous ; reduced leaves distant, oblong-linear, blunt, 

 sessile, subentire, 1 -nerved, veinless; heads small, ovoid, distant in loose, rigid corymbs, 

 long-pedicellate ; exterior involucral scales ovate, bluntish, interior ovate-lanceolate, ciliate 

 at the blnntish point ; achenium glabrous : pappus whitish, 1-serial. — Br. Jam. t. 34./. 4. — 

 Calea, i. ; Chrysocoma, L.j Molina, Less. — 3'-8' high, shrubby or arborescent; leaves 

 2"'_3m long j heads li'" long, whitish. — Hab. Jamaica I, all coll., on the summits .of the 

 mountains, S. Andrews, Port Royal. 



18. PLUCHEA. Cass. 



Head discoid : ? flowers exterior, many -serial, subtruncate-filiform ; g central, campa- 

 nulate above, furnished with i> subentire style. Involucre imbricate. Receptacle naked. 

 Anthers 2-tailed. Achenium suboylindrical : pappus pilose. — Shrubs or herbs, often fetid; 

 heads purplish, corymbose. 



y' _ 73. P. odorata, Cass. Shrubby 4 branches rusty-tomentose ; leaves oblong or ellip- 

 •^ tical-oblong, pointed, quite entire, or denticulate, repand, glandular-puberulous above, hoary- 



