174 



RUBIACEAE. 



Flowers in dense beads, tbe hypanthla not coalescent. 

 Flowers solitary or in an open Inflorescence, or if 



clustered, tbe hypantbla coalescent. 

 Ovule pendulous. 



Filaments wholly or partly adnate to the 



corolla-tube. 



Filaments not adnate to tbe corolla-tube. 

 Inflorescence terminal. 

 Inflorescence axillary. 

 Ovule not pendulous. 



Ovule or seed with a basal attachment. 

 Ovule or seed with a lateral attachment. 

 Shrubs or trees. 



Flowers in terminal clusters, tbe hypan- 

 thla coalescent : sepals minute or 

 obsolete. 

 Flowers axillary and solitary : sepals 



slender. 

 Herbs. 



Stipules relatively small or inconspicu- 

 ous, more or less cleft. 

 Ovary 3- or 4-celled. 

 Ovary 2-celled. 



Mature carpels merely separating 



from each other. 

 Styles partially united : stigmas 

 slender : corolla salverform. 

 Styles united to the top : stigma 

 capitate or 2-lobed : corolla 

 funnelform. 

 Mature carpels dehiscent. 



Fruit septlcldal, and both cnr- 



pels ventrally dehiscent. 

 Fruit separating Into carpels, 

 one of which opens through 

 the ventral face, the other 



remaining closed. 



Stipules follaceous, usually resembling 

 the 



6. CEPHALASTIIT-S. 



7. GCETTARDA. 



8. EEITHAI.IS. 



!. OlIOCOCCA. 



10. PSTCHOTRIA. 



11. MOKIM'A. 



12. El;-- 



13. RlCHARPIA. 



14. DlODIA. 



15. DlODELLA. 



10. BORBERIA. 



17. SPERMACOCE. 

 iceous, usually resembling 

 leaves. is. I;M n M . 



1. HOUSTONIA L. Krect or creeping herbs. Leaf-blades narrow or 

 broad.- Flowers in open or compact cymes. Sepals 4, commonly narrow. 

 Corolla funnelform or salverform: tube long: lobes mostly shorter than the 

 tube. Stamens 4: filaments adnate to above the middle of the corolla-tube. 

 Style slender. Capsule seated on or in the hypanthium, flattened. 



1. H. filifolia (A. Gray) Small. Plants loosely or diffusely branched, 0.5-2 

 dm. tall: blades of the stem-leaves narrowly linear to subulate, 0.5 '' cm. 

 long: sepals lanceolate, becoming deltoid, scarcely 1 mm. long: corolla white 

 or purplish; tube about 3 mm. long, sparingly pubescent within: capsules 

 globose-obovoid, about 1.5 mm. long. Pinelands. F. K. 



2. EX08TEMA L. ('. Ri.-h. Shrubs or trees. Leaf-blades l.-aihi-ry. 

 1'lnucrs axillary or in paniculate cymes. Sepals 5, short. Corolla with a 

 slender tube and 5 narrow lobes. Stamens 5: filaments adnate to the base of 

 the corolla-tube, pubescent below: anthers narrowly linear, exserted. CapMilc 

 elongate. Seeds winged. 



1. E. caribaetun (Jacq.) R. & 8. Shrub or small tree, the foliage glabrous: 

 leaf -blades oblong to elliptic, 2-6 cm. long: sepals 1-2 mm. long: corolla white 

 or rose-tinged; the tube 3.5-4 cm. long; lobes narrowly linear: capsules 

 elliptic, 10-12 mm. long. Hammocks. K. K. 



WOOD. 



(Bah., Cuba, Ant.) PRINCE- 



3. OA8A8IA A. Rich. Unarmed shrubs or trees. Leaf-blades leathery. 

 Flowers in axillary cymes. Sepals 5, broad or narrow. Corolla with a stout 



