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Annual, perennial herb, aquatic, (generally fresh to alkaline), glabrous, from rhizomes, tubers, or winter buds. Stem: erect, simple to branched, cylindric to compressed, rooting at lower nodes; nodal glands present or not. Leaf: simple, cauline, alternate or in subopposite pairs; submersed thread-like to round, sessile or petioled; floating present or not, elliptic to ovate, petioled, leathery; sheath open, continuous with petiole or ± free from blade base, generally stipuled, stipules fused and ligule-like or not. Inflorescence: spike, cylindric to spheric, axillary or terminal, generally emergent, peduncled; bracts 0. Flower: inconspicuous, bisexual; perianth parts 4, clawed, ± green, limb generally adaxially concave; stamens 4, each fused to base of perianth part [or not], filament generally 0 [short, wide], anthers open to outside; pistils 4, ovary 1-chambered, ovule 1, attached to chamber base, style 0 or short. Fruit: drupe, generally obovate, sessile. Seed: 1.
3 genera, ± 95 species: worldwide. [Haynes & Hellquist 2000 FNANM 22:47–74] Recently treated elsewhere to include Zannichelliaceae. Ruppia moved to Ruppiaceae. —Scientific Editor: Thomas J. Rosatti.
Unabridged references: [Angiosperm Phylogeny Group 1998 Ann Missouri Bot Gard 85:531–553]
Key to Potamogetonaceae
Annual, perennial herb, rhizomed or not, tubers 0, winter buds generally 0. Stem: simple or branched, cylindric to compressed; nodal glands present or 0. Leaf: submersed, also floating or not, generally flat, generally green, entire to finely serrate; submersed sessile or not, linear to round, tip rounded to acuminate, veins 1–35; floating 0 or generally petioled, elliptic to ovate, leathery; stipules of submersed leaves free from blade base or fused to it < 1/2 stipule length. Inflorescence: generally floating to emergent; peduncle stiff. Fruit: generally beaked, abaxially with 0 or 1 central keel, 0 or 2 lateral, sometimes lower keels, sides concave to convex.Key to Potamogeton
± 88 species: generally temperate northern hemisphere. (Greek: river neighbor, from aquatic habitat) Other taxa in TJM (1993) moved to Stuckenia.
Unabridged references: [Haynes 1974 Rhodora 76:564–649; Haynes 1985 Sida 11:173–188; Wiegleb 1988 Fedde Rep Sp Nov Regni Veg 99:249–266; Wiegleb & Kaplan 1998, Folia Geobot 33: 241–316.]
Perennial herb, delicate. Stem: < 50 cm, branches many, above, cylindric. Leaf: submersed sessile, ± 6 cm, 1–5 mm wide, linear, thin, tip acute, vein 1; stipules sheath-like basally, liguled, < 1 cm, fused to blade base for ± 1/4–1/2 stipule length, or 1–15 mm; floating petiole < 2 × blade, blade 0.5–3 cm, 0.3–0.8 mm wide, elliptic, tapered at base, tapered or rounded at tip. Inflorescence: < 1.5 cm, of 2 kinds; lower submersed, spheric, subsessile, upper emergent, cylindric, long-peduncled. Fruit: 1.1–1.8 mm, ± spheric, compressed; keels 3, middle highest, sides flat to concave.
Uncommon. Shallow water, ponds, lakes; < 2500 m. Inner North Coast Ranges, Cascade Range Foothills, n&c Sierra Nevada Foothills, n High Sierra Nevada, Great Central Valley, South Coast, San Jacinto Mountains, Modoc Plateau; to British Columbia, eastern United States, Arizona, Mexico. Apr–Sep [Online Interchange]
Previous taxon: Potamogeton crispus
Next taxon: Potamogeton epihydrus
Citation for the whole project: Jepson Flora Project (eds.) 2013. Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html, accessed on Jul 26 2014
Citation for this treatment: [Author of taxon treatment] 2013. Potamogeton, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/cgi-bin/get_IJM.pl?tid=39562, accessed on Jul 26 2014
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