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Stamens 5, filaments free, delicate, flattened; pseudostaminodes shortly and narrowly oblong with an incised apex, or more commonly small and tooth-like,to obscure or absent; anthers bilocular.
Ovary uniovulate, densely lanate in at least the upper two-thirds; style elongate (often exserted), stigma solitary and small.
Capsule delicate, irregularly splitting with the ripening of the seed.
Seeds yellow or reddish, somewhat compressed, feebly reticulate.
Perennial herbs with a stout rootstock and slender, erect stems.
Leaves opposite, subopposite or some alternate, entire.
Perianth segments 5, free.