Epiphytic or epipetric, caulescent, stiffly ascending to erect herbs or subshrubs, without modified stems. Stems branches few. Leaves opposite, strongly unequal in a pair, venation pinnate, foliar nectaries present on lower leaf surface. Flowers sometimes cleistogamous, axillary, solitary or in fasciculate few-flowered inflorescences; epedunculate; bracteoles small; pedicellate. Calyx lobes 5, free; corolla white to yellowish, narrowly funnelform, limb 5-lobed; stamens included, filaments basally connate, anthers coherent in 2 pairs, dehiscing by longitudinal slits, thecae parallel; staminode absent; disc a single dorsal gland; ovary superior, stigma capitate to stomatomorphic. Fruit a fleshy, loculicidally dehiscent, 2-valved, green to purplish capsule, valves recurving to reveal seed mass.
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