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University of Illinois Library Herbs or shrubs, often epiphytic; stems often unbranched, fleshy, usually pubescent; leaves opposite or rarely alternate, those of a pair often unequal, petiolate, the blades usually membranous, entire or toothed, pinnately veined; flowers hermaphrodite, axillary or rarely terminal, solitary, fasciculate, umbellate, or racemose, often bracteate; calyx lobes often colored, free or connate, 5, usually valvate, often unequal, sometimes toothed or incised; corolla vari- ously colored, gamopetalous, often spurred at base, the tube cylindric, ventricose or upwardly ampliate, often hairy, the limb usually bila- biate, the lobes rounded, sometimes toothed or fimbriate; stamens 4, didynamous, a rudimentary fifth sometimes present, the filaments adnate to the corolla at the base, often connate, often contorted, the anthers quadrate to oblong, often connate, the cells discrete or con- fluent, longitudinally dehiscent; ovary superior or partly or wholly inferior, 1-celled, the 2 parietal placentae 2-lobed, the ovules anatro- pous, very numerous, borne on the inner surface of the lobes or on both the inner and outer surfaces; style simple, elongate; stigma bilobed or stomatomorphic; disk hypogynous or perigynous, annular ) or of distinct glands; fruit capsular or baccate, the pericarp usually coriaceous; seeds minute, very numerous, usually fusiform, spirally striate.

,i many respects most interesting groups of Costa Rican plants, and J include also many of the most beautiful and showy ones.

While they are found at all elevations and in almost every locality, they attain most profuse development at upper elevations, chiefly in the more humid forests.