Common Name: PONDWEED FAMILY Habit: 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 [0]4, clawed, +- green, limb generally adaxially concave; stamens [2]4, each fused to base of perianth part [or not], filament generally 0 [short, wide], anthers open to outside; pistils [1]4, ovary 1-chambered, ovule 1, attached to chamber base, style 0 or short. Fruit: drupe, generally obovate, sessile. Seed: 1. Genera In Family: 3 genera, +- 95 species: worldwide. Note: Recently treated elsewhere to include Zannichelliaceae. Ruppia moved to Ruppiaceae. eFlora Treatment Author: C. Barre Hellquist, Robert F. Thorne & Robert R. Haynes Scientific Editor: Thomas J. Rosatti.
Common Name: PONDWEED Habit: 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. Etymology: (Greek: river neighbor, from aquatic habitat) Note: Other taxa in TJM (1993) moved to Stuckenia. Unabridged Reference: 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.
Common Name: LEAFY PONDWEED Habit: 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.
Potamogeton foliosus Raf. subsp. foliosus
NATIVE Habit: 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. Chromosomes: 2n=28. Ecology: Common. Ponds, lakes, streams; Elevation: < 2300 m. Bioregional Distribution: NW, CaRH, SNF, n SNH, GV, CW, SW (exc ChI), GB, D; Distribution Outside California: to Alaska, eastern Canada, Central America. Flowering Time: Jul--Oct Synonyms: Potamogeton foliosus var. foliosus Jepson eFlora Author: C. Barre Hellquist, Robert F. Thorne & Robert R. Haynes Index of California Plant Names (ICPN; linked via the Jepson Online Interchange) Previous taxon: Potamogeton foliosus subsp. fibrillosus Next taxon: Potamogeton gramineus
Botanical illustration including Potamogeton foliosus subsp. foliosus
Citation for this treatment: C. Barre Hellquist, Robert F. Thorne & Robert R. Haynes 2012, Potamogeton foliosus subsp. foliosus, in Jepson Flora Project (eds.) Jepson eFlora, https://ucjeps.berkeley.edu/eflora/eflora_display.php?tid=80562, accessed on April 19, 2024.
Citation for the whole project: Jepson Flora Project (eds.) 2024, Jepson eFlora, https://ucjeps.berkeley.edu/eflora/, accessed on April 19, 2024.
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Duplicates counted once; synonyms included.
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