348 RUBIACE.E. 



proximate, margined, 3-5 -nerved, 12"'-6'" long ; drupe subglobose, yellow, size of a pea. — 

 Hab. Bahamas !, Swains., Hjalmars., in calcareous soil along the seacoast ; Jamaica !, Pd., 

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



Subtribe 6. CEPHALANTHEJE. — Ovules 'pendulous. Seeds albuminous: embryo in- 

 cluded. Pericarp dry. . Corolla-lobes imbricative. — Inflorescence contracted. 



52. MACHAONIA, Bonpl. 



Calyx-limb 5-4-partite. Corolla infundibular : 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. Albumen fleshy. — Shrubs, often spiny: hairs short, incurved; stipules 

 interpetiolar, single, undivided ; cymes, corymb if orm, terminal: flowers pedicellate. 



155. M. rotundata, Gr. (n. sp.). Nearly unarmed; branchlets puberulous; leaves 

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

 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., which is more 

 dowuy, has more pointed leaves, and smaller, pubescent carpids. 1C/-12' high; leaves 

 3"-2" long, 2i"-li" broad; panicle subfastigiate, 3"-4" broad; corolla 2"' long, 5-cleft 



-nearly to the middle; fruit 3'" long, ]'" broad.— Hab. Jamaica!, Macf, Ed., Wils., in 

 swampy marshes along the coast, S. Thomas i. 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 the base. — SI. t. 174. f. 3, 4. — Lippia, Sw. ! — Habit of Spiraa chamatdrifoiia s 

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

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

 southern districts, Liguana hills, AL, S. Jago savannah, Clarendon, (Si.). 



Subtbibe 7. SPERMAC0CE2E— Ovules laterally attached. Pericarp dry. Seeds albu- 

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

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



53. DIODIA, L. 



Calyx-limb 4-2(-10)-partite, persistent. Corolla infundibular : lobes 4, valvate. Stigma 

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

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



■\ Leaves sessile, veinless. 



157. 1>. 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. Lcefl. — Slender, spithameous ; corolla 2"' long, white or pale-purple ; 

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

 Panama!]. 



158. D. rigida, Cham. Schlecht.! Perennial, suffrutescent; stems ascending, tetra- 

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

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

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

 as the carpids ; corolla-tube clavate-campanulate : lobes deltoid ; fruit subglobose, glabrescent : 

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

 corolla 4'" long, purplish or white.— Hab. Antigua !, Wullschl., S. T incent !, in savannahs ; 

 [Cuba !, Haiti ! ; Panama 1 to Uruguay !]. 



