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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, rhizomes matted. Stem: < 100 cm, branches generally many, short, cylindric. Leaf: submersed blade 2–10 cm, (3)10–27 mm wide, elliptic, minutely serrate, tip acute or long-tapered, veins 3–9, petiole 0 (<= 3 cm); floating generally on short, axillary branches, blade < petiole, 1.5–7 cm, 1–3 cm wide, elliptic to ovate, tip ± obtuse, veins 11–13; stipules < 3 cm, free, persistent. Inflorescence: 1–4 cm. Fruit: 1.9–2.3 mm, keels 3, beak erect, 0.3–0.5 mm.
n=26. Uncommon. Shallow water, ponds, lakes, bogs; 900–2750 m. Klamath Ranges, Inner North Coast Ranges, High Cascade Range, High Sierra Nevada, San Francisco Bay Area, San Bernardino Mountains, Great Basin Floristic Province; to Alaska, Greenland, Arizona; Eurasia. Hybridizes with Potamogeton alpinus, Potamogeton illinoensis, Potamogeton natans, Potamogeton nodosus, Potamogeton richardsonii. Jul–Aug [Online Interchange]
Previous taxon: Potamogeton foliosus subsp. foliosus
Next taxon: Potamogeton illinoensis
Citation for the whole project: Jepson Flora Project (eds.) 2013. Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html, accessed on Jan 28 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=39574, accessed on Jan 28 2015
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|Geographic subdivisions indicated for the distribution of Potamogeton gramineus|| 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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