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Leaves opposite or verticillate, or upper alternate, linear to linear-lanceolate, entire, or pinnatifid with linear or filiform segments.
Capsule ovoid, ellipsoid or subglobose, of ten compressed above, retuse, emarginate or rounded at apex, loculicidal.
Corolla tube usually short, at times exserted, enlarged at throat; limb spreading, lobes 5 broad subequal entire.
Annual or perennial herbs or undershrubs, usually erect, branched, glabrous, scabrid, woolly or tomentose.
Inflorescence terminal, racemose or spicate; flowers bracteate, pedicellate or not, bi-bracteolate.
Calyx campanulate, 5-lobed; lobes valvate, linear-triangular to broadly deltate.
Seeds numerous, oblong to obovoid or at times narrowly cylindric.
Style elongated, thickened or flattened at apex.
