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ELATINACEAE WATERWORT FAMILY

Gordon C. Tucker & Evanielis U. Grissom

Annual, short-lived perennial herb, in or near water; roots fibrous, from taproot or not, generally from lower leaf axils also. Stem: generally soft. Leaf: simple, opposite, ± 4-ranked; stipules scarious. Inflorescence: flowers in upper axils, 1 or few in clusters. Flower: small, inconspicuous, radial, bisexual; sepals, petals 2–5, equal in number, generally free; ovary spheric, styles 3–5, short. Fruit: capsule, septicidal, ± spheric, ovoid, or depressed-ovoid, walls thin; chambers 2–5, each several to many-seeded. Seed: small; surface net-like or glossy.
2 genera, 50 species: ± worldwide. [Yang & Tucker 2007 Fl China 13:55–56] —Scientific Editor: Thomas J. Rosatti.
Unabridged references: [Tucker 1986 J Arnold Arbor 67:471–483]

Key to Elatinaceae

ELATINE WATERWORT
Stem: Erect underwater, ± prostrate on wet ground, branched or not; base not woody. Leaf: petiole < 1/3 blade, flat, ± blade-like; blades narrow-elliptic to ± round, ± entire, bases wedge-shaped to ± round, tips round. Inflorescence: flowers 1(2) per node. Flower: sepals, petals wide-elliptic, membranous; sepals pale green; petals pale green-white; stamens (1) 3, 6, 8, filaments 1/2 × to ± equal petals, anthers wide-ovoid; styles 3–4. Fruit: ± spheric or depressed-ovoid; chambers 3–4, each 3–15-seeded; pedicel generally ± 0. Seed: ± visible through fruit wall, elliptic, straight or curved, brown to yellow-brown; surface net-like due to ridges between ± linear rows of pits.
± 25 species: worldwide. (Greek: fir tree, from a European species that suggests such a plant in miniature) At least 20× magnification needed for pits on seeds.

Key to Elatine

E. rubella Rydb.
NATIVE
Stem: prostrate to erect, 3–6(15) cm, often tinted ± red. Leaf: lance-oblong; petiole < 1/4 blade; tip blunt to notched. Inflorescence: flowers 1–2 per node. Flower: sepals 2, ± equal, or 3, 1 < others; petals 3, equal, wide-elliptic; stamens 3, alternate sepals. Fruit: chambers 3. Seed: narrow-oblong, straight or curved < 15°; pits 16–35 per row, ± as wide as long.
Muddy shores, shallow vernal pools, rice fields; < 500 m. California; western United States. Apr–Jul [Online Interchange]

Previous taxon: Elatine heterandra
Next taxon: Ericaceae

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Citation for the whole project: Jepson Flora Project (eds.) 2013. Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html, accessed on Jul 30 2014
Citation for this treatment: [Author of taxon treatment] 2013. Elatine, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/cgi-bin/get_IJM.pl?tid=23924, accessed on Jul 30 2014

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click for enlargement Elatine rubella
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© 2004 Carol W. Witham

Bioregions in which Elatine rubella occurs Markers link to CCH specimen records. If the markers are obscured, reload the page [or change window size and reload]. Yellow markers indicate records that may provide evidence for eFlora range revision or may have georeferencing or identification issues.
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CCH collections by month

Duplicates counted once; synonyms included.
Species do not include records of infraspecific taxa.
Blue line denotes eFlora flowering time.