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Elatinaceae

(Family)

Overview

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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 × 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.

Two genera and ca. 50 species: temperate and tropical regions; two genera and six species in China.[1]

Photos

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Taxonomy

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The Family Elatinaceae is a member of the Order Malpighiales. Here is the complete "parentage" of Elatinaceae:

The Family Elatinaceae is further organized into finer groupings including:

Genera

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Alsinastrum

[more]

Bergia

A genus in the Kingdom Animalia. [more]

Birolia

[more]

Crypta

[more]

Elatine

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 × 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.[2] [more]

Elatinella

[more]

Hydropiper

[more]

Ilyphilos

[more]

Lancretia

[more]

Merimea

[more]

Potamopitys

[more]

Rhizium

[more]

More info about the Genus Rhizium may be found here.

Bibliography

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Footnotes

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  1. 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.
  2. 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.

Sources

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Last Revised: August 26, 2014
2014/08/26 05:30:09