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POTAMOGETONACEAE PONDWEED FAMILY

C. Barre Hellquist, Robert F. Thorne & Robert R. Haynes

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.
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

STUCKENIA PONDWEED
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.
x=13.
±7 species: worldwide.
Unabridged references: [Börner 1912 Botanisch-systematische Notizen. Abh. Naturwiss. Vereine Bremen 21:245–282; Holub 1977 Preslia 69:361–366]

Key to Stuckenia

S. striata (Ruiz & Pav.) Holub NEVADA PONDWEED
NATIVE
Rhizomed, tubers 0. Stem: < 60 cm, branches many, subcylindric, ± white. Leaf: 2–10 cm, (0.4)1.5–5(8.5) mm wide, linear, veins 3–5, tip with abrupt, medium-long to long point (rounded); stipules < 3 cm, sheaths not inflated. Inflorescence: axillary (terminal), interrupted below, 13–45 mm, whorls 4–9; peduncle 1.2–5.2 cm. Fruit: 3–3.9 mm, beak conspicuous.
Uncommon. Shallow, alkaline water, ponds, lakes; < 1450 m. Sierra Nevada, Great Central Valley, San Francisco Bay Area, Great Basin Floristic Province, Mojave Desert; to Oregon, Colorado, Texas, Mexico, Central America, South America. [Coleogeton striatus (Ruiz & Pav.) Les & R.R. Haynes; Potamogeton latifolius (J.W. Robbins) Morong] May be locally abundant. Jul–Aug [Online Interchange]

Previous taxon: Stuckenia pectinata
Next taxon: Ruppiaceae

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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=80316, accessed on Apr 19 2014

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Bioregions in which Stuckenia striata occurs 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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CCH collections by month

Duplicates counted once; synonyms included.
Species do not include records of infraspecific taxa.
Blue line denotes eFlora flowering time.