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Annual or perennial herbs, sometimes suffrutescent or subscandent; glabrous or pubescent. Leaves opposite or subopposite, those of a pair often unequal, large leaves often alternating; petiolate; blade entire, sinuate or undulate, raphides prominent, linear, base sometimes inequilateral. Inflorescences varying from a terminal or axillary panicle to paniculate capitula, or flowers arranged in racemes, unequally pedicellate umbels or cymes, flowers rarely solitary; branches often subtended by a small hyaline bract; pedicellate or subsessile; bracteoles 1-3, minute, hyaline. Flowers bisexual, small; perianth corolla-like, campanulate, subrotate or funnelform, lower part constricted above ovary, persistent, upper part (limb) shallowly 5-lobed, flaring, deciduous; stamens 1-3(-5), exserted or included, filaments free or connate below, pollen forate, 2(-3)-nucleate; ovary shortly stipitate, ovule anacampylotropous, style filiform, stigma 1, capitate, subexserted to exserted. Anthocarps shortly stipitate, clavate, fusiform or subellipsoid, 3-5(-10)-angled, -ribbed or -winged, green, with stipitate, viscous glands on ribs (eglandular in B. erecta, not in the Guianas), and streaks of white, linear superficial raphides in furrows between ribs; seed with thin testa adherent to pericarp, embryo with unequal cotyledons curved inward, enclosing scant, mealy endosperm, radicle elongate, descending.


Guianas present, pantropical and subtropical present
About 20 species of pantropical and subtropical weeds, 1 of these in the Guianas.