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Potamogetonaceae 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. Jepson eFlora Author: C. Barre Hellquist, Robert F. Thorne & Robert R. Haynes Reference: Haynes & Hellquist 2000 FNANM 22:47--74 Unabridged Reference: Angiosperm Phylogeny Group 1998 Ann Missouri Bot Gard 85:531--553 Scientific Editor: Thomas J. Rosatti. Index of California Plant Names (ICPN; linked via the Jepson Online Interchange) Key to Potamogetonaceae Previous taxon: Monochoria vaginalis Next taxon: Potamogeton |