Limosella

Small, glabrous, annual or possibly short-lived perennial herbs, often stoloniferous. Leaves usually radical by suppression of internodes, rarely opposite on new stolons, with a long slender petiole dilated at the base, and a small to large, palmately veined, entire, glandular-punctate blade shorter than, rarely equalling, the petiole. Flowers solitary in leaf-axils at base of plant, with bracts and bracteoles absent. Calyx-tube 5-angled, equally 5-toothed, or rarely in depauperate plants 3- or 4-merous; corolla more or less actinomorphic, campanulate, just exserted from the calyx, lobes 5, almost equal; stamens 4, anthers 1-locular; stigma obscurely 2-lobed, subcapitate. Capsule almost entirely surrounded by the enlarged persistent calyx, septum incomplete, absent in the upper half; seeds numerous, striate-reticulate.