| + | Pubescent or hirsute herbs, rarely glaucous: lvs. small, opposite, entire: fls. white, borne in terminal, dichotomous cymes; sepals 5, rarely 4; petals as many, emarginate or 2-cleft; stamens 10, rarely fewer; styles 5, rarely 4 or 3, opposite the sepals: caps, cylindric, often curved, dehiscing at the top by 10, rarely 8, teeth.—About 100 species of world-wide distribution according to the largest delimitation of the genus; by some authorities reduced to 40 or 50 species. |