Short-stemmed, hairy, annual herbs; branches often ± decumbent. Lvs mostly cauline, 3-partite, with each segment usually divided into several lobes; stipules broad, clasping, 5-7-lobed, adnate to petiole, persistent. Infl. of numerous, axillary, 5-15-flowered cymes forming glomerules, < to slightly > stipules. Fls 4-5-merous, small, greenish to yellowish, subsessile or pedicellate, ☿. Hypanthium urceolate to turbinate. Epicalyx present or 0. Calyx with 4-5, triangular sepals. Petals 0. Stamens 1-(2), inserted on inner margin of hypanthium disc. Ovary superior, surrounded by the deep hypanthium; carpel 1; style 1; ovule 1. Fr. a single achene enclosed in the thin, dry hypanthium.