Jepson eFlora: Taxon page
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Ruppia cirrhosa

Higher Taxonomy
Family: RuppiaceaeView Description 

Habit: 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.
Genera In Family: 1 genus, +- 10 species: +- worldwide.
eFlora Treatment Author: Robert F. Thorne, C. Barre Hellquist & Robert R. Haynes
Scientific Editor: Thomas J. Rosatti.
Genus: RuppiaView DescriptionDichotomous Key

Common Name: DITCH-GRASS

Etymology: (Heinrich Bernhard Ruppius, German botanist, 1688--1719) Note: 2 North American species +- indistinct; study needed.

Ruppia cirrhosa (Petagna) Grande
Chromosomes: 2n=40.
Ecology: Freshwater marshes, ponds, sloughs; Elevation: < 2045 m. Bioregional Distribution: NCo, NCoRI, Teh, SnJV, CW, SCo, SnBr, GB, D; Distribution Outside California: to Alaska, east-central United States; +- worldwide. Flowering Time: Apr--Jul
Synonyms: Ruppia occidentalis S. Watson; Ruppia spiralis L. ex Dumort.; Ruppia spiralis L., ined.
eFlora Treatment Author: Robert F. Thorne, C. Barre Hellquist & Robert R. Haynes
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botanical illustration including Ruppia cirrhosa


Citation for this treatment: Robert F. Thorne, C. Barre Hellquist & Robert R. Haynes 2016. Ruppia cirrhosa, in Jepson Flora Project (eds.) Jepson eFlora,, accessed on May 05, 2016.

Citation for the whole project: Jepson Flora Project (eds.) 2016. Jepson eFlora,, accessed on May 05, 2016.

Geographic subdivisions for Ruppia cirrhosa:
NCo, NCoRI, Teh, SnJV, CW, SCo, SnBr, GB, D;
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.