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Robert F. Thorne, C. Barre Hellquist & Robert R. Haynes

Annual [(perennial herb)], submersed. Stem: generally many-branched, thread-like, rooting at lower nodes. Leaf: cauline, alternate to ± opposite, sessile, linear, < 10 cm, < 1 mm wide; stipules < 15 mm, ± completely fused to blade, sheath-like, ± open. Inflorescence: terminal, head-like spikes with subtending bract, < 20-flowered; peduncle elongating after flower [or not], coiling or not, ovary base elongating after fertilization, becoming stalk-like. Flower: bisexual, minute; perianth 0; stamens 2, anthers ± sessile; pistils (2)4(8), simple, ovule attached to chamber top, stigma sessile, peltate. Fruit: drupe, ± nut-like, stalk-like at base, beaked, ovoid-oblique.
1 genus, ± 10 species: ± worldwide. —Scientific Editor: Thomas J. Rosatti.

(H.B. Ruppius, German botanist, 1688–1719) [Haynes 2000 FNANM 22:75–76] 2 North American species ± indistinct; study needed.
Unabridged etymology: (Heinrich Bernhard Ruppius, German botanist, 1688–1719)
Unabridged references: [Haynes 2000 FNANM 22:75–76; Setchell 1946 Proc Calif Acad Sci 25:469–478]

Key to Ruppia

R. maritima L.

2n=20. Brackish or saline waters, often coastal, marshes, ponds, sloughs; < 600 m. North Coast, sw San Joaquin Valley (Soda Lake, San Luis Obispo Co.), Central Western California, South Coast, Channel Islands; ± worldwide. Mar–Aug [Online Interchange]

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Citation for the whole project: Jepson Flora Project (eds.) 2013. Jepson eFlora,, accessed on Dec 1 2015
Citation for this treatment: [Author of taxon treatment] 2013. Ruppia, in Jepson Flora Project (eds.) Jepson eFlora,, accessed on Dec 1 2015

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Geographic subdivisions indicated for the distribution of Ruppia maritima 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.
map of distribution 1
(Note: any qualifiers in the taxon distribution description, such as 'northern', 'southern', 'adjacent' etc., are not reflected in the map above, and in some cases indication of a taxon in a subdivision is based on a single collection or author-verified occurence).

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Data provided by the participants of the Consortium of California Herbaria.
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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.