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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, rhizomed. Stem: < 150 cm, branches generally many, slender, cylindric. Leaf: submersed blade 6–20 cm, 15–50 mm wide, elliptic to oblanceolate, microscopically serrate near tip, tip acute-mucronate, veins 7–19, petiole 0 or 0.5–4 cm; floating 0 or blade generally > petiole, 4–12 cm, 2–6 cm wide, widely elliptic to oblong-elliptic, tip rounded-mucronate, veins 13–29; stipules 2.5–7 cm, free, persistent. Inflorescence: generally < 6 cm. Fruit: 2.5–3.6 mm, keels 3, lateral lower, beak erect to ± recurved, 0.5–0.8 mm.
n=52. Lakes, ponds, streams; 400–2350 m. North Coast Ranges, Cascade Range, High Sierra Nevada, Great Central Valley, Central Western California (except Inner South Coast Ranges), San Gabriel Mountains, San Bernardino Mountains, Peninsular Ranges, Great Basin Floristic Province; to British Columbia, eastern Canada, Texas, Baja California; also Central America, South America, Caribbean. Hybridizes with Potamogeton amplifolius, Potamogeton gramineus, Potamogeton nodosus, Potamogeton richardsonii. Jun–Aug [Online Interchange]
Previous taxon: Potamogeton gramineus
Next taxon: Potamogeton natans
Citation for the whole project: Jepson Flora Project (eds.) 2013. Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html, accessed on Mar 1 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=39581, accessed on Mar 1 2015
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|Geographic subdivisions indicated for the distribution of Potamogeton illinoensis|| 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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