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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.]
Annual (perennial herb), rhizomes rare, slender, winter buds present. Stem: branches many, ± compressed; nodal glands 0 (faint). Leaf: submersed, sessile, 1–10 cm, linear, veins 1–3(5); stipules fused, sheath-like. Inflorescence: 1.5–7 mm, short-cylindric to spheric; peduncle 0.3–1.1(3.7) cm, club-shaped. Fruit: olive to green-brown, keel 1, wavy, wing-like, sides convex to ± concave. [Online Interchange]
Rhizomes slender, rare. Stem: < 100 cm, compressed; nodal glands faint or 0. Leaf: 1–10 cm, 0.3–2.5 mm wide, tip acute to abruptly pointed; stipules < 2 cm, veins in age decaying, occasionally persistent as delicate fibers. Inflorescence: ± spheric, generally not interrupted. Fruit: 1.5–2.7 mm, 1.2–2.2 mm wide, olive to green-brown, keel 0.2–0.4 mm high, beak 0.2–0.6 mm.
2n=28. Common. Ponds, lakes, streams; < 2300 m. Northwestern California, High Cascade Range, Sierra Nevada Foothills, n High Sierra Nevada, Great Central Valley, Central Western California, Southwestern California (except Channel Islands), Great Basin Floristic Province, Desert; to Alaska, eastern Canada, Central America. [Potamogeton foliosus var. foliosus] Jul–Oct [Online Interchange]
Previous taxon: Potamogeton foliosus subsp. fibrillosus
Next taxon: Potamogeton gramineus
Citation for the whole project: Jepson Flora Project (eds.) 2013. Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html, accessed on Aug 3 2015
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=80562, accessed on Aug 3 2015
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|Geographic subdivisions indicated for the distribution of Potamogeton foliosus subsp. foliosus|| 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.
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(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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