Herbs, scandent, annual or often biennial, with indefinite leafy main shoot and numerous axillary cymes. Petals fused for most of their length, spongy. Nectaries absent. Seeds without elaiosomes.

Two species: one endemic to E North America, the other in NE China, Korea, and Russia (Far East).

(Authors: Zhang Mingli (张明理); Magnus Lidén)