EUBIACEAE. 137 



greenish, about 4 mm. long; lobes ovate, glabrous: drupes ovoid or oval-ovoid, 

 10-12 mm. long. — Hammocks, U. S. keys, U. keys. — [E. K.] — (Bah., Ciiha, 

 Ant.) — White WOOD. 



2. XIMENIA [Plum.] L. Thorny shrubs or trees. Leaf -blades thick. 

 Hypanthium without an elevated disk. Sepals minute. Corolla rotate. 

 Anthers linear. Ovary nearly superior. 



i'^'^ 1. X. americana L. Shrub or small tree, with dark branches: leaf-blades 

 oblong to elliptic or nearly so, 3-7 cm. long: corolla about 10 mm. long; lobes 

 linear, densely pubescent within: drupes subglobose or broadly oval, 14-17 

 mm. long. — Hammocks, pinelands and coastal sand-dunes, U. S. keys, IT. keys, 

 L. keys. — [E. K.] — {Bah., Cuba, Ant.) — Tallowy-wood. 



Order RUBIALES. 



Herbs, shrubs, or trees. Leaves opposite, sometimes whorled. Flowers 

 perfect or polygamous, axillary or cymose. Hypanthium present. Calyx 

 of 2 or more, often small, sepals. Corolla of 3 or more partially united 

 petals. Androeeium of as many stamens as there are corolla-lobes or twice 

 as many. Gynoecium 2-several-carpellary. Ovary wholly or partially 

 inferior. Fiiiit a capsule, a berry, or a drupe. 



Family 1. RUBIACEAE. Madder Family. 



Herbs, shrubs, trees, or vines. Leaves opposite or whorled with 

 interpetiolar stipules. Flowers perfect or polygamous, regular or nearly 

 so. Calyx of 2-6, or more, sepals surmounting the hypanthium, or obso- 

 lete. Corolla of 3-6, or more, partially united petals. Androeeium of as 

 many stamens as there are calyx-lobes and alternate with them. Gynoe- 

 cium 2-several-carpellary. 



Seeds wingless : anthers and filaments short : ovary and hypanthium short. 



1. HOUSTONIA. 



Seeds winged : anthers and filaments long : ovary and hypanthium 

 long. 

 Cavities of the ovary with several or many ovules : seeds several 

 or many. 

 Fruit dry. 2. Exostema. 



Fruit pulpy. 



Fruit 2-celIed. 



Flowers in cymes. 3. Casasia. 



Flowers solitary. 



Sepals 5 : corolla-lobes 5 : free portions of the 



filaments short : anthers oblong or nearly so. 4. Randia. 

 Sepals 4 : corolla-lobes 4 : free portions of the 



filaments elongate : anthers linear. 5. Catesbaea. 



Fruit 5-celled. 6. Hamelia. 



Cavities of the ovary with a single ovule each : seed solitary. 

 Ovule pendulous. 



Filaments wholly or partly adnate to the corolla-tube. 7. Guettarda. 



Filaments not adnate to the corolla-tube. 



Inflorescence terminal. 8. Erithalis. 



Inflorescence axillary. 9. Chiococca. 



Ovule not pendulous. 



Corolla rotate : filaments scarcely adnate to the corolla : 



anthers coherent as a tube around the style. 10. STKtrjiPFiA. 



Corolla not rotate : filaments manifestly adnate to the 

 corolla-tube : anthers distinct. 

 Ovule or seed with a basal attachment. 11. Psychotria. 



Ovule or seed with a lateral attachment. 

 Shrubs or trees. 



