262 Annals of the Carnegie Museum. 



Corolla-lobes twisted. 



Flowers perfect; ovules immersed in the central placenta. 



Flowers subsessile, axillary, 1-3 per axil; shrubs; leaves less than 



10 cm. long 676. Randia milis. 



Flowers in few-flowered terminal corymbs; trees; leaves 10-25 cm. 



long 677. Genipa americana. 



Flowers dioecious. 



Stipules soon deciduous leaving a ring-like scar just at upper 



edge of leaf-scars; flowers in fascicled, terminal clusters. 



678. A maioua fagifolia. 



Stipules persistent, 1-2 cm. long; flowers sessile, the pistillate 



single, terminal, staminate several 679. Alihertia edulis. 



Corolla-lobes imbricate, tube narrowly cylindrical, crimson, more than 



I cm. long. 



Cymes rather wide spreading 680. Hamelia patens. 



Cymes rather compactly erect 681. Hamelia erecta. 



Ovules solitary in each cell of the fruit. 



Flowers in dense rounded heads. 



673. Cephalanthus occidentalis var. salicifolius. 



Flowers not in dense rounded heads. 



Ovules pendulous. 



Filaments more or less adnate to the corolla-tube. 



Fruit drupe-like, not springing apart. 



Calyx finally deciduous; stigma capitate. 



682. Guettarda calyptrata. 



Calyx persistent; stigma 2-3-lobed 683. Antirrhcea^nuiflora. 



Fruit dry, springing apart into two long narrow lobes. 



Fruit sparingly pubescent 685. Machaonia trifurcata. 



Fruit essentially glabrous 684. Machaonia litloralis. 



Filaments free from the corolla-tube except at the very base; climbing 



shrubs 686. Chiococca alba. 



Ovules not pendulous. 



Corolla-lobes twisted or imbricate; low shrubs with 3-whorled thickish- 



linear revolute leaves 687. Strumpfia maritima. 



Corolla-lobes valvate. 



Ovule or seed attached at the base of the carpel. 



Ovary 2- (or more) loculed, septa thick. 



Corolla straight (Psychotria). 



Leaf-blades glabrous or essentially so. 



Corolla 2.5-3 mm. long; calyx glabrous, bracts shorter 



than the calyx 690. Psychotria undata. 



Corolla 7-8 mm. long; calyx finely puberulous, bracts 



shorter than the calyx 691. Psychotria revolula. 



Bracts longer than the corolla. 



688. Psychotria involucrata. 



Leaf-blades puberulent, at least on the veins beneath. 



