348 RUBIACEJl!. 



( proximate, margined, 3-5-nerved, ia"'-6"' long; drape subglobose, yellow, size of a pea.— 

 Had. Bahamas \,Swains., Ejalmars., in calcareous soil along the seacoast; Jamaica!, Vd., 

 S. Anns; [Florida! to Guadeloupe !]. 



SuBTEiBE 6. CEFHALANTHTSJU. — Ovules pendulotis. Seeds alirnninms: embryo in- 

 clnded. Pericarp dry. Corolla-lobes imiricative. — Inflorescence contracted. 



53. MACHAONIA, Boti^l 



Calyx-limb 5-4-partite. Corolla infiindibnlar : lobes slightly imbricative. Stamens in- 

 serted into the corolla-throat : anthers oval. Stigma bluntly 2-fid. Fruit dicoccous, obcu- 

 neate-prismatical : cocci indehiscent, coriaceous, separating from a central simple carpophore : 

 seeds pendulous. Jlbumen fleshy. — Shrubs, often spiny: hairs short, incurved; stipules 

 interpetiolar, single, undivided ; cymes corymbiform, terminal: &owers pedicellate. 



155. M. rotundata, Or. {n. sp.). Nearly unarmed; branchlets puberulous; leaves 

 petioled, ovate-rounded, bluntish or mucronate, glabrous : stipules subulate ; cymes trieho- 

 tomous, contracted; pedicels pubescent, clustered, shorter than the calyx-tube; calyx-lobes 

 5, oval, shorter than the tube ; corolla villous at the throat ; filaments as long as the corolla- 

 lobes ; carpids glabrescent, oblong-linear, tapering at the base, 3-gonal. — Nearly allied to 

 (and perhaps not sufficiently distinguished from) M. acuminata, Bonpl., vfhich is more 

 downy, has more pointed leaves, and smaller, pubescent carpids. 10'-12' high; leaves 

 8"-2'' long, 2i"-li" broad; panicle subfastigiate, 3"-^" broad; corolla 2'" long, 5-cleft 

 nearly to the middle ; fruit 3'" long, 1'" broad. — Hab. Jamaica I, Macf., Pd., Wils., in 

 swampy marshes along the coast, S. Thomas 1. E. 



156. M. cymosa, Gr. Spinescent; cymiferous branchlets pilose, short, often forming 

 a racemiform panicle ; leaves petioled, ovate, blunt or bluntish, glabrescent : stipules minute, 

 deltoid-subulate ; cymes simply corymbiform, hispid-pilose : inferior pedicels as long as the 

 campanulate calyx ; calyx-lobes 4, lanceolate, acuminate, at length as long as the tube ; 

 corolla hairy at the throat ; anthers subsessile ; carpids pilose, 3-gonal, tapering from the 

 summit to (he base. — SI. t. Vti.f. 3,- 4. — Lippia, Sw. I — Habit of Spiraea chameedrifolia : 

 branches slender; leaves 6"'-12" long; cymes 8"'-liJ"' diam. ; corolla 2'" long, 4-cleft to 

 one-thiri; fruit 2'" long, 1'" broad at the summit. — Hab. Jamaica!, Sw., Macf., Al., in the 

 southern districts, Liguana hiUs, Al., S. Jago savannah, Clarendon, {SI.). 



SuETRiBE 7. SPERMACOCEM— Ovules laterally attached. Pericarp dry. Seeds albu- 

 minous : embryo included, radicle inferior. Corolla-lobes vahate. — Stem usually her- 

 baceous ; stipules connecting opposite leaves, divided into bristles, rarely obsolete. 



53. DIODIA, Z. 



Calyx-limb 4-3(-10)-partite, persistent. Corolla infundibular : lobes 4, valvate. Stigma 

 emarginate or 2-fid. Fruit 2-coccous : cocci indehiscent. Seeds furrowed at the commis- 

 sure. — Stem herbaceous or suffhttescent ; flowers axillary, sessile. 



-j- Leaves sessile, veinless. 



157. D. prostrata, Sw.! Annual, strigose; leaves linear, veinless, sessile, revolute 

 at the margin : stipular bristles setaceous, longer than their sheath ; flowers subsolitary in 



'•^ the axils ; calyx-lobes 4, deltoid-lanceolate, bluntish, much shorter than the carpids ; corolla- 

 tube slender, obovate ; fruit subglobose, slightly keeled, hard, hispid. — Spermacoce strigosa, 

 L. (non Auct.J, ex syn. loe/l. — Slender, spithameous ; corolla 2'" long, white or pale-purple ; 

 carpids ecostate on the sides. — Hab. Jamaica!, Sw., M'Jfab, in sandy fields; [Mexico to 

 Panama !]. 



158. D. rigida, Cham. Sohleeht.! Perennial, suffrutescent ; stems ascending, teti'a- 

 gonal, hairy or glabrescent ; leaves lanceolate, aouoiijiate with a terminal bristle, veinless, 

 sessile, antrorsely scabrous on the revolute margin and midrib beneath : stipular bristles long- 

 filiform, flexuose; axils few(-l) -flowered; calyx-lobes 4 (-2), lanceolate-linear, half as long 

 as ilie carpids ; corolla-tube clavate-campanulate : lobes deltoid ; frait subglobose, glabrescent : 

 carpids %-costate. — Spermacoce, Kth. D. setigera, DC. I — Variable in the down, diffuse ; 

 corolla 4'" long, purplish or white.— Hab. Antigua!, Wullschl., S. Vincent!, in savannahs; 

 [Cuba !, Haiti ! ; Panama ! to Uruguay !] . 



