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Fls perfect; tep 5, petaloid, unequal in width, connate toward the base; stamens 8; ovary 3-angled; styles 3, with capitellate stigma; fr a trigonous achene, much exceeding the persistent but scarcely enlarged cal; embryo within the endosperm, with broad, often folded cotyledons; annual herbs with alternate, petiolate, broadly triangular lvs and obliquely truncate ocreae; fls white or pink, pediceled in fascicles disposed in racemes arising from the axils of short bracts. 15, temp Eurasia.
Erect annual andromonoecious herbs with hollow stems. Lvs cauline, triangular to sagittate or hastate, cordate; ochreae short, truncate. Fls in terminal or axillary racemose to corymbose panicles, heterostylous. Pedicels not jointed. Perianth segments 5, free, not keeled, equal or nearly so, not or scarcely accrescent. Stamens 8, alternating with nectaries. Styles 3; stigmas capitate. Fr. a trigonous nut, long-exserted from perianth; surrounding perianth segments spineless.
Herbs annual or perennial, rarely subshrubs, monoecious. Stems erect, glabrous or pubescent. Leaves simple, alternate, petiolate; leaf blade triangular, cordate, broadly ovate, sagittate, or linear; ocrea membranous, oblique, margin entire, apex acute or truncate. Inflorescence racemose or corymbose. Flowers bisexual. Perianth persistent, 5-parted; tepals 5, not accrescent. Stamens 8. Styles 3, elongate; stigmas capitate. Achenes trigonous, not winged or horned at base.
Flowers hermaphrodite, heterostylous, in shortly pedunculate bracteate clusters, arranged in terminal and axillary raceme-like panicles.
Perianth 5-merous, campanulate; segments almost free, subequal, with a main vein and 2 collateral veins arising near the base.
Nut much exceeding the perianth, triquetrous with sharp angles and elsewhere sometimes with barbed bristles.
Stamens 7–8, alternating with yellow nectaries on the disk.
Ocrea short, obliquely truncate, entire.
Stem erect, glabrous or hairy, hollow.
Styles 3, filiform; stigmas capitate.
Leaves alternate, petiolate.
Annual or perennial herbs.
