Oncocalyx Tiegh.

Small shrubs with a single haustorial connection, glabrous or with short spreading simple hairs. Leaves mostly alternate, with 1–2 pairs of strongly ascending nerves from near the base. Flowers clustered or 2–6 in very shortly pedunculate umbels; bract saucer-shaped to cupular, truncate or with a small limb. Calyx cupular to tubular. Corolla 5-merous, generally joined less than halfway, sometimes up to 2/3 but then with long slits below filament-insertions, opening with a V-shaped split on one side, generally yellow at least in part, sometimes banded red and white or greenish, developing vents in mature buds; tube constricted above a basal swelling or narrow throughout; lobes linear, sometimes a little broadened above, sometimes dilated around vents at the base, erect, recurved or revolute. Filaments attached at the base of corolla-lobes or some distance above, inrolled at anthesis, sometimes with small appendages in front of the anther or a little below; anthers 4-thecous, truncate or with a small bilobed connective-appendage. Style filiform; stigma ovoid-globose to obovoid. Berry red, usually obovoid, often with a subpersistent calyx, occasionally verrucose.