1110 RUBIACEAE 



axillary or terminal cymes. Hypanthiiim clavate or turbinate. Sepals 5, persistent. 

 Corolla mostly white, broadly funnelforra, pul)escent at the throat : lobes 5, obtuse, valvate. 

 Stamens 5, adnate to the throat of the corolla. Ovary 2-celled : styles partially united. 

 Ovules several in each cavity. Capsule slightly 2-lobed, membranous, included in the 

 hypanthium, loculicidal. Seeds numerous, angled. Testa smooth. Endosperm fleshy. 



1. Penti-don Halei (T. & G.) A. Gray. Plant tender, glabrous. Stems weak, 

 brandling and diffuse, decumbent, often creeping : leaf-blades oblong to oval or oblong- 

 lanceolate, 1-5 cm. long, acute or abruptly acuminate, entire, narrowed into margined 

 petioles : peduncles shorter than the leaves : hypanthium clavate, shorter than the pedicel, 

 4-6 mm. long at maturity : sepals triangular-lanceolate, shorter than the hypanthium : 

 corolla about 2 mm. long, surpassing the sepals, glabrous within : capsules 3-4 mm. long. 



In swampy grounds, Florida to Louisiana. Spring to fall. 



5. EXOSTEMA L. C. Eich. 



Shrubs or trees, with terete branches. Leaves opposite : stijjules interpetiolar, entire 

 or 2-cleft. Flowers perfect, solitary and axillary, or in terminal panicles. Hypanthium 

 clavate, turbinate or obovate. Sepals 5, narrow. Corolla white, salverforra : tube elon- 

 gated : lobes 5, narroAv, imbricated, 2 exterior. Stamens 5, adnate to the base of the 

 corolla-tube. Disk annular. Ovary 2-celled : styles united, filiform : stigma entire or 2- 

 lobed. Ovules numerous in each cavity, ascending. Capsule elongated, 2-celled, open- 

 ing by 2 septicidal entire or 2-parted valves. Seeds numerous in each cavity. Testa mem- 

 branous, produced into wings. Endosperm fleshy. 



1. Exostema Caiibafeum (Jacq.) R. & S. A shrub or small tree, 2-8 m. tall, the 

 foliage glalirous. Leaf-blades oblong to ellijitic, 2-6 cm. long, acute or acuminate at both, 

 ends, entire, often slightly undulate ; petioles 5-10 mm. long : pedicels shorter than the 

 petioles: hypanthium 4-7 mm. long during anthesis : sepals triangular or triangular-subu- 

 late, shorter than the hypanthium : corolla white or rose-tinged; tube 3.5-4 cm. long; 

 lobes narrowly linear, shorter than the tube : filaments exserted : capsules 10-12 mm. long, 

 elliptic: seeds about 3 ram. long, winged. 



In sand, Keys of Florida. Also in the West Indies and Mexico. 



6. GENIPA L. 



Shrubs or trees, with terete branches. Leaves opposite : blades leathery, lustrous : 

 stipules deciduous. Flowers perfect, in short-peduncled axillary cymes. Hypanthium 

 turbinate or campanulate. Calyx truncate or with 5-6 obtuse sepals, persistent. Corolla 

 white or yellow, salverform or nearly rotate : tube pubescent in the throat : lobes 5-6, 

 spreading, leathery, contorted. Stamens 5-6, adnate to the mouth of the corolla-tube : 

 anthers sessile, narrow, the connective produced beyond the sacs. Disk cup-like. Ovary 

 1-2-celled : styles stout. Ovules numerous in each cavity. Fruit a thick pulpy berry. 

 Seeds numerous, angled, flattened. Testa somewhat fibrous. Endosperm cartilaginous. 



1. Genipa clusiifolia (Jacq.) Griseb. A branching shrub, 1-2 ni. tall, the foliage 

 glabrous, turning black in drying. Leaves clustered ; blades leathery, obovate to cuneate, 

 5-15 cm. long, rounded or retuse at the apex, lustrous, often mucronate, entire, short- 

 petioled : hypanthium 8-10 mm. long, turbinate : sepals subulate, shoi'ter than the hypan- 

 thium : corolla fleshy, glabrous ; tube 1.5-2 cm. long ; lobes lanceolate or oblong-lanceolate, 

 shorter than the tube : berries ovoid to obovoid, 5-7 cm. long. 



On the coast and Keys of southern Florida. Also in the Bahamas and West Indies. 



7. RANDIA L. 



Armed or unarmed shrubs or trees, with erect or climbing stems. Leaves opposite : 

 blades often leathery. Flowers perfect, solitary, usually axillary. Hypanthium turbinate, 

 obovoid or ovoid, terete or ribbed. Sepals 4, very low, or obsolete. Corolla white, yellow 

 or pink, funnelform, salverform or campanulate : tube variable in length : lobes 5, convo- 

 lute. Stamens 5, adnate to the throat of the corolla : filaments short or nearly wanting. 

 Disk annular or cushion-like. Ovary 2-celled or very rarely 3-4-celled : styles rarely dis- 

 tinct, usually united, stout, terminating in a club-shaped, spindle-shaped or rarely cleft 

 stigma. Ovules numerous, or sometimes 2 or more in each cavity, immersed in placenta 



