22 RUBIACE.E. 



cells. Style filiform, exserted : stigmas 2, obtuse. Drupe obovate, thiu-fleshy, containing 

 2 cartilaginous plano-convex nutlets. Seed plano-couvex. Embryo straight in fleshy albu- 

 men : cotyledons cordate, foliaceous : radicle inferior. Leaves fleshy-coriaceous, sessile. 

 * * * * Low herbs, with entire and naked interpetiolar stipules : ovules erect, anatropous : 

 style filiform : stigmas filiform or linear. 



1 9. MITCHELLA. Flowers (3-6-) generally 4-merous, heterogone-dimorphous, geminate 

 at tlie summit of a peduncle and the ovaries of the two connate. Calyx-teeth persistent. 

 Corolla between salverform and fuunelforni ; lobes valvate in the bud, upper face densely 

 villous-bearded within. Stamens inserted in the throat of corolla, with oblong anthers, on 

 short filaments when the filiform style is exserted, on long exserted filaments when the style 

 and stigmas are included. Style-branches 4, hirsute-stigmatose down the inner side. Fruit 

 a globular baccate .syncarp, containing 8 compressed roundish cartilaginous nutlets (4 to each 

 flower). Albumen cartilaginous : embryo minute. Prostrate and creeping evergreen. 



20. KELLOGGIA. Flowers (3-5-) generally 4-merous, singly slender-pedunculate. Calyx 

 with obovate tube and minute persistent teeth. Corolla between funnelform and salver- 

 form ; lobes naked, valvate in the bud. Stamens inserted in the throat of the corolla, more 

 or less exserted : filaments flattened : anthers oblong-linear, fixed above the base. Style fili- 

 form, exserted : stigmas 2, linear-clavate, papillose-pubescent. Ovary 2-celled : ovules erect 

 from the base, anatropous. Fruit small, dry and coriaceous, beset with uncinate bristles, 

 separating at maturity into 2 closed carpels, whicli are conformed and adherent to the seed, 

 somewhat reniforra in cro.ss section. Embryo comparatively large, in fleshy albumen : coty- 

 ledons elliptical, as long as the radicle. 



***** Low herbs, with short-vaginate stipules setiferous or sometimes only 4-6-cus- 

 pidate : ovary 2— 4-celled : solitary ovules borne on the septum and amphitropous : fruit 

 dry: seed sulcate or excavated on the ventral face : embryo in corneous or firm-fleshy 

 alliumen; the radicle inferior: flowers small, sessile in terminal and axillary glomerules : 

 corolla funnelform or salverform ; lobes valvate in the bud. 



-1— Fruit circumscissile, upper part with persistent calyx-liml) falling off, exposing the seeds. 



2 1 . MITRAC ARPUS. Flowers commonly 4-merous, capitate-glomerate. Calyx-lobes per- 

 sistent, unequal, tlie alternate pair mostly shorter or minute and stipule-like. Stamens in- 

 sei'ted on the throat of the coroUa. Short style-branclies or stigmas 2. Fruit didymous, 

 membranaceous, 2-celled, a pyxidium, the upper half separating from the lower l>y transverse 

 circular dehiscence. Seed cruciately 4-lobed on the ventral side. 



•i— -1— Fruit septicidal into its 2 to 4 component carpels : calyx-limb gamopliylloiis at base 

 and circumscissile-deciduous as a whole at or before dehiscence: stamens liorne on the 

 throat of the coroUa. 



22. RICHARDIA. Flowers (4-8-) commonly 5-6-merous and 2-4-carpellary. Calyx-lobes 

 ovate-lanceolute or narrower. Corolla funnelform. Stigmas 2 to 4, linear or spatulate. 

 Carpels separating from apex to base, coriaceous, roughish, closed or nearly so ; no per- 

 sistent axis. 



23. CRUSEA. Flowers (3-5-) usually 4-merous and 2- (sometimes 3-4-) carpellary. Calyx- 

 lobes subulate to triangular-lanceolate, sometimes very unequal or intermediate ones reduced 

 to small teeth. Corolla salverform to narrow funnelform. Stigmas 2 to 4, linear to spatu- 

 late-oval. Fruit 2-4-lobed, separating from a persistent axis into obovoid or globular charta- 

 ceous carpels, which either open at the commissure or sometimes remain closed. 



•*—•)—-)— Fruit septicidal at summit or thronghout, its 2 or rarely 3 carpels or valves bear- 

 ing persistent and (^uite or nearly distinct calyx-teeth. 



24. SPERMACOCE. Calyx-teeth, lobes of the short corolla, and stamens 4, or two of the 

 former sometimes abortive. Fruit small, from membranaceous to thin-crustaceous, one or 

 both the carpels opening ventrally to discliarge the seed : no persistent carpophore, or some- 

 times a thin dissepiment remaining. 



25. DIODIA. Calyx-lobes (1 to 6) usually 2 or 4, distinct, distant. Corolla funnelform or 

 nearly salverform, with mostly 4-lobcd limb, and stamens as many, inserted in its throat. 

 Style filiform, entire or 2-cleft : stigmas 2. Fi-uit somewhat fleshy-drupaceous or crustaceo- 

 coriaceous, tardily separating through the dissepiment into 2 closed carpels : no car- 

 pophore. 



