Jepson Herbarium
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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 America 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]

2n=40. Freshwater marshes, ponds, sloughs; < 2045 m. North Coast, Inner North Coast Ranges, Tehachapi Mountain Area, San Joaquin Valley, Central Western California, South Coast, San Bernardino Mountains, Great Basin Floristic Province, Desert;

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Citation for the whole project: Jepson Flora Project (eds.) [year] Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html [accessed on month, day, year]
Citation for an individual treatment: [Author of taxon treatment] [year]. [Taxon name] in Jepson Flora Project (eds.) Jepson eFlora, [URL for treatment]. Accessed on [month, day, year].

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Bioregions in which taxon occurs	Red area (if present) is the part of the bioregion lying between the upper and lower elevation limits of the taxon; 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 have georeferencing or identification issues.
Chart based on elevation range in Manual and elevations and coordinates of CCH records. Data provided by the participants of the Consortium of California Herbaria. Note: About half of the CCH records include both elevation and coordinates.	Map made in collaboration with Scott Loarie. Data provided by the participants of the Consortium of California Herbaria. View all CCH records   CCH collections by month Duplicates counted once; synonyms included. Species do not include records of infraspecific taxa. Blue line denotes Manual flowering time.