Harveya

Erect or ascending, parasitic herbs, usually turning black on drying. Leaves opposite or alternate, usually, at least to some extent, reduced to scales. Flowers either solitary and axillary or in terminal spikes or racemes. Calyx 5-toothed or 5-lobed. Corolla tube narrow below and much enlarged above; lobes 5. Stamens 4, didynamous; anthers 2-thecous, one theca perfect, the other empty. Capsule ovoid to subspherical.