SYNANTHERE.E. 371 



Tr. 74. ; [Pennsylvania ! to Uruguay ! ; Egypt ! to Natal ; Arabia !, Mesopotamia I, Trans- 

 caucasia! and Northern China ! to the East Indies ! and trop. Australia !]. 



28. BORRICHIA, Ad. 



Head radiate : the ray-flowers <j> , short. Involucre hemispherical, imbricate : exterior 

 row foliaceous. Receptacle paleaceous : palea: oblong, rigid. Style-branches subcylindrical 

 bluntish, hairy from the summit to near the base. Achenia of the disk compressed-4-gonal • 

 crown short, 4 -toothed. — Maritime shrubs ; leaves opposite, sessile, leathery ; heads solitary 

 peduncled, terminal, yellow. 



95. B. arborescens, DC. Silyery-9ericeous or glabrescent ; leaves spathulate or lan- 

 ceolate, mucronulate, quite entire ; involucre adpressed ; palea spathulate-oblong mucro- 

 nate. — Buphthalmum, L. B. frutescens jamaicense, L., Sw. Obs. Borr. argentea DC. • 

 the common West Indian, silvery form, but the glabrous one of DC. is no variety glabrous 

 and silvery leaves occurring on the same stem. 4'-l' high ; variable in the* ligules obovate 

 or oblong, the exterior scales of the involucre ovate or oblong, as long as the inner ones or 

 shorter and somewhat spreading. — II a b. Bahamas!, Swains., Turk Islands !, Hjalmars. ■ 

 Jamaica !, Mac/., Wils., March, on calcareous rocks and in dry places along the coast • An- 

 tigua !, Wullschl. ; [Bermudas, Key West ; Cuba ! to Guadeloupe ! and Peru]. 



29. WEDELIA, Jacg. 



Head radiate (rarely discoid) : the ray-flowers ? . Involucre 2-serial, exterior foliaceous, 

 interior scaly. Receptacle slightly convex, paleaceous. Style-branches hispidulous above' 

 or from the summit nearly to the base. Achenium biconvex, or angular : crown unequally 

 lobed or dentate. — Herbs or shrubs ; leaves opposite ; heads peduncled, terminal and axil- 

 lary, solitary or ternate, yellow. 



Sect. 1. Stemmodon. — Ligules Z-dentate. Style-branches bluntish, cylindrical, hispidu- 

 lous to the middle. Achenium muricate, glabrous. — Creeping, aromatic herbs, with as- 

 cending branches. 



96. "W. carnosa, Rich. Glabrescent ; leaves sessile, cnneate-oblong or obovate 

 coarsely few-serrate, or trilobed ; peduncles solitary iu the axils, equalling or exceeding the 

 leaves, pubescent ; involucral leaves oval-oblong, as long as the disk, scales shorter; ligules 

 shortly exserted, obovate ; achenia of the ray trigonal-ovoid, bluntish at the base, muri- 

 cate: crown short, multidentate-repand. — SI. t. 155./. 1. — Silphium trilobatum, L. W. 

 crenata, Rich. — Spithameous, from a long-creeping, stoloniferous base ; leaves triplinerved 

 variable, l"-3" long ; disk-flowers much papillose at the lobes ; palese oblong -lanceolate 

 acute. — Hab. Bahamas!, Swains.; Jamaica!, all coll., in wet places; Dominica!, Imr., s! 

 Vincent !, Guild. ; Trinidad !, Cr. ; [Cuba ! to French islands !, Sieb. Mart. 199 ; Panama ! 

 to Pernambuco!]. 



97. "W\ gracilis, Rich. Stems slender, pilose, 1 -few-headed ; leaves subsessile, cuneate- 

 oval, blunt, inciso-few-serrate or trilobed, ciliate, glabrescent ; peduncles much longer than 

 the leaves, pilose, usually from the uppermost axil ; involucral leaves obovate, as long as 

 the disk, scales shorter; ligules shortly exserted, oblong or obovate-quadrate; achenia of 

 the ray obovate, tapering at the base, biconvex with an argute margin, of the disk subcom- 

 pressed, fusiform-stipitate, both kinds muricate-tubercled : crown produced, with a lobed, 

 membranaceous limb. — Spithameous, ascending from the creeping, filiform roots, the stem 

 more delicate than in the preceding ; leaves 10"'-12"' long and often as broad, triplinerved ; 

 peduncles 3"-4" long ; heads 8'" diatn. ; palea; oblong-linear, bluntish or acute ; achenia 

 2'" long smaller than in the preceding, those of the disk tapering from the middle into their 

 slender stalk. Hab. Jamaica!, AL, Wullschl., S. Andrews near Kingston, S. Anns; Man- 

 chester. 



Sect 2 Cyathophora, DC. — Ligules 2(-3) -dentate. Style-branches acute, hispidulous 

 from the summit nearly to the base. Achenium puberulous.—Scahrom shrubs, or suf- 

 'frutescent herbs ; peduucles terminal. 

 98 W. caraca»ana, DC. Shrubby, scabrous with hispidulou» apprcssed down; 



