Herbs annual, perennial, or subshrubs, semiaquatic or terrestrial, dwarf. Leaves opposite or verticillate, petiolate; stipules paired; leaf blade simple, margin entire or serrate. Flowers solitary, clustered, or in axillary cymes, bisexual, actinomorphic, small. Sepals 2-5, imbricate, free or slightly united, thinly membranous or with nearly pellucid margins. Petals 2-5, imbricate in bud, free, membranous. Stamens 1 or 2 Ã— as many as sepals, free; anthers dorsifixed, 2-loculed. Ovary superior, 2-5-loculed, many ovuled; placentation axile; styles 2-5, free, short; stigmas capitate. Fruit a septicidal capsule, membranous, leathery, or crustaceous. Seeds numerous, straight or curved, small; testa often rugose; endosperm absent.
The Family Elatinaceae is further organized into finer groupings including:
- Genus (12): Alsinastrum · Bergia · Birolia · Crypta · Elatine · Elatinella · Hydropiper · Ilyphilos · Lancretia · Merimea · Potamopitys · Rhizium
- Species: ZipcodeZoo has pages for 154 species, subspecies, varieties, forms, and cultivars in the Family Elatinaceae.
Herbs annual, aquatic. Stem prostrate, slender, rooting at nodes. Leaves opposite or verticillate, shortly petiolate; leaf blade small, margin usually entire. Flowers usually only 1 per node, very small. Sepals 2-4, united at base, membranous, apex subacute. Petals 2-4, longer than sepals, apex obtuse. Stamens 1 or 2 Ã— as many as petals. Ovary globose, compressed, 2-4-loculed, apex truncate; ovules numerous; styles 2-4; stigmas capitate. Capsule membranous, 2-4-septicidal. Seeds straight, curved, or horseshoe-shaped, surface reticulate-striate with hexagonal or elliptic pits. [more]
More info about the Genus Rhizium may be found here.
- Zhang Pengyun & Zhang Yaojia. 1990. Elatinaceae. In: Li Hsiwen, ed., Fl. Reipubl. Popularis Sin. 50(2): 132-138.
- Qiner Yang & Gordon C. Tucker "Elatinaceae". in Flora of China Vol. 13 Page 55. Published by Science Press (Beijing) and Missouri Botanical Garden Press. Online at EFloras.org.
- Qiner Yang & Gordon C. Tucker "Elatine". in Flora of China Vol. 13 Page 55, 56. Published by Science Press (Beijing) and Missouri Botanical Garden Press. Online at EFloras.org.
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