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Capsule oblong, laterally compressed or not, fairly bilobed, with an indented line along the line of dehiscence, bivalved; valves tom at the apex, with a revolute margin being the tom septum, glabrous inside; dry placentae with seeds in valves.
Pistil glabrous; ovary narrowly ovoid to oblong, laterally compressed, rounded or shortly bilobed at the apex, with a disk–like base, 2–celled; style persistent; stigma capitate.
Sepals equal, green, glabrous on both sides or scaly outside, united for 0·2–0·4 of their length, obtuse, rounded or nearly so at the apex, entire, persistent.
Corolla cup–shaped, mostly glabrous outside, inside pillose, at least in the tube; lobes imbricate, suborbicular, rounded, entire, spreading.
Undershrubs or herbs with woody base, glabrous or bearing stellate hairs.
Lower bracts leafy, decreasing towards the apex.
Inflorescence a terminal raceme.
Pedicels suberect, bibracteate.
Leaves opposite, sessile.
Flowers 4–merous.
