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Key to families | Table of families and genera
Indexes to all accepted names and synonyms:
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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
Perennial herb, rhizomed, tubered or not, winter buds 0. Stem: branched, cylindric. Leaf: submersed, sessile, channeled, entire, tip acute to abruptly pointed, notched, or rounded, veins 1–5; stipules fused to leaf blade >= 2/3 stipule length. Inflorescence: submersed; peduncle flexible. Fruit: beaked or not, keel 0.Key to Stuckenia
±7 species: worldwide.
Unabridged references: [Börner 1912 Botanisch-systematische Notizen. Abh. Naturwiss. Vereine Bremen 21:245–282; Holub 1977 Preslia 69:361–366]
Tubered, rhizomes matted. Stem: < 80 cm, branches many, ± cylindric. Leaf: < 15(35) cm, 0.2–1 mm wide, generally thread-like, tip acute or with abrupt, short to medium-long point; stipules 2–5 cm, sheaths not inflated. Inflorescence: axillary or terminal, interrupted in fruit, 14–22 mm, whorls 2–6; peduncle 4.5–11.4 cm. Fruit: 2.5–5 mm, beak conspicuous.
Common. Ponds, lakes, marshes, streams; < 2400 m. California; worldwide. [Potamogeton pectinatus L.; Coleogeton pectinatus (L.) Les & R.R. Haynes] Often weedy in reservoirs, irrigation canals; important food for waterfowl. May–Jul [Online Interchange]
Previous taxon: Stuckenia filiformis subsp. alpina
Next taxon: Stuckenia striata
Citation for the whole project: Jepson Flora Project (eds.) 2013. Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html, accessed on Apr 19 2014
Citation for this treatment: [Author of taxon treatment] 2012. Stuckenia, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/cgi-bin/get_IJM.pl?tid=80429, accessed on Apr 19 2014
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