|Jepson Flora Project: Jepson Interchange|
|TREATMENT FROM THE JEPSON MANUAL (1993)||
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Jepson Interchange (more information)
©Copyright 1993 by the Regents of the University of California
AND IS MAINTAINED FOR ARCHIVAL PURPOSES ONLY
Annual, perennial herb, aquatic, (generally fresh to alkaline water), glabrous, from rhizomes or small, bulb-like, winter buds
Stems erect, simple to branched, cylindric or flattened
Leaves simple, cauline, alternate or in subopposite pairs; submersed thread-like to round, sessile or petioled; floating, if present, elliptic to ovate, petioled, leathery; sheath open, continuous with petiole or ± free from leaf base, generally with stipules, stipules sometimes fused, ligule-like
Inflorescence: spike or head-like, axillary or terminal, generally emergent, peduncled; bracts 0
Flower bisexual; perianth parts 0 or 4, clawed; stamens 2 or 4, if 4, each fused to base of perianth part, sessile or filament short, wide, anthers open to outside; pistils 4, ovary 1-chambered, ovule 1, style short or stigmas sessile
Genera in family: 3 genera, ± 95 species: worldwide
Recent taxonomic note: Recently treated to include Zannichelliaceae [Angiosperm Phylogeny Group 1998 Ann Missouri Bot Gard 85:531553].
Perennial from slender rhizomes
Stems generally many-branched, thread-like, rooting at lower nodes
Leaves cauline, alternate, < 10 cm, < 1 mm wide; tip acute; stipules < 15 mm, ± completely fused to leaf base, sheath-like below leaf junction, ± open
Inflorescence terminal; flowers 2, sessile; peduncle elongated, straight or coiled in fruit
Flower minute; perianth 0; stamens 2, anthers sessile; pistils generally 4(28), simple, ovule attached at top of chamber, stigma sessile, peltate
Fruit ovoid, oblique, long-stalked
Species in genus: 2+ species: temp worldwide
Etymology: (Heinrich Bernhard Ruppius, German botanist, 16881719)
Reference: [Setchell 1946 Proc Calif Acad Sci 25:469478]
Recent taxonomic note: Ruppia sometimes treated in Ruppiaceae.
Leaf < 1 mm wide; tip acute
Inflorescence: peduncle in fruit 330 cm, coiled or flexible
Ecology: Marshes, ponds, sloughs
Elevation: < 2045 m.
Bioregional distribution: 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
Distribution outside California: ± worldwide
Flowering time: MarAug
Synonyms: R. spiralis Dumort
Possibly indistinct from R. maritima ; needs further study.