Erect, fleshy, scaly, root-parasites, often conspicuously swollen at base. Spikes often large, congested. Flowers large, outcurved, bracteate and usually 2-bracteolate. Calyx tubular-campanulate, 4-5-lobed, rarely fissured posteriorly. Corolla tubular-infundibuliform, with usually 5, subequal lobes. Stamens, subexserted, inserted low down on the corolla-tube; anthers equally 2-celled, much shorter than the filaments. Ovary 1-celled, many-ovuled on 4, parietal placentae; style long, decurved at the tip with broad stigma; seeds small, subglobose, reticulately punctate.