Abstract
Perennial or annual herbs of aquatic or moist terrestrial habitats, rarely (Bergia suffruticosa) suffrutescent; nodes unilacunar 1-trace (Elatine); indumentum of unicellular and multicellular multiseriate capitate trichomes, or plants glabrous; a resinous secretion widely distributed in the tissues and deposited in granular form on the surface of the stems. Leaves opposite and decussate, rarely (Elatine alsinastrum) verticillate, entire or coarsely serrate; stipules minute, scarious, distinct or interpetiolar. Inflorescences axillary, dichasial, or flowers solitary. Flowers hermaphroditic, small, actinomorphic, hypogynous, usually inconspicuous, occasionally cleistogamous; sepals 2–5(6), distinct or connate basally; petals 2–5, distinct, membranaceous, imbricate, persistent; stamens (2)3–6(–10), in 1 or 2 whorls, the outer whorl antesepalous; anthers broadly ovoid, dorsifixed, introrse, dehiscing by longitudinal slits; ovary superior, (depressed-)ovoid, (2)3–5-locular, the partitions not reaching the top of the ovary in some Bergia, stylodia 3–5; stigmas capitate, papillate; placentation axile or basal; ovules numerous, anatropous, bitegmic, weakly crassinucellar. Fruit a thin-walled septicidal capsule. Seeds ellipsoid to oblong, 0.5–1.5 mm long, with finely reticulate or smooth surfaces; endosperm reduced to 1–5 cell layers (Bergia) or 0 (Elatine); embryo straight or less often curved, filling nearly the entire seed; germination epigaeal. x = 6, 9.
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Kubitzki, K. (2014). Elatinaceae. In: Kubitzki, K. (eds) Flowering Plants. Eudicots. The Families and Genera of Vascular Plants, vol 11. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-39417-1_8
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