Terrestrial or rarely epiphytic, caulescent, erect or sometimes decumbent herbs, tuberous. Stems unbranched. Leaves opposite, equal or subequal in a pair, venation pinnate, foliar nectaries absent. Flowers axillary (but appearing terminal by exceeding stem apex), 1-9-flowered cymose or umbellate, pedunculate inflorescences, with small leafy bracteoles; pedicellate. Calyx lobes 5, basally connate into a tube; corolla yellow to orange, with orange or reddish lines or spots, cylindric, lobes 5; stamens included, filaments basally connate, anthers sometimes coherent, dehiscing by longitudinal slits, thecae parallel; staminode absent; disc a single dorsal, 2-lobed gland; ovary superior, stigma 2-lobed. Fruit a fleshy, brown capsule, loculicidally dehiscent, 2-to several-valved, valves opening slightly.
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