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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

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.
±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. filiformis (Pers.) Börner subsp. alpina (Blytt) R.R. Haynes et al. SLENDER-LEAVED PONDWEED
Slender, rhizomed, tubered. Stem: < 65 cm, branches below, subcylindric. Leaf: < 12 cm, < 3 mm wide, linear to bristle-like, tip notched, blunt, rounded (or with abrupt, short point); stipules < 3 cm, sheaths on proximal stems often inflated, others not. Inflorescence: terminal, interrupted below, 5–55 mm, whorls 2–6(9); peduncle 2–10(15) cm. Fruit: 2–3 mm, beak inconspicuous.
2n=66. Shallow, clear water of lakes, drainage channels; 300–2150 m. Klamath Ranges, c High Sierra Nevada, Great Central Valley, Central Coast, San Francisco Bay Area, Great Basin Floristic Province; to Alaska, Arizona, Greenland, Eurasia. [Coleogeton filiformis (Pers.) Les & R.R. Haynes subsp. alpinus (Blytt) Les & R.R. Haynes; Potamogeton filiformis Pers. var. alpinus (Blytt) Asch. & Graebn; Potamogeton filiformis var. macounii Morong] Unrecognized subsp. under Potamogeton filiformis in TJM (1993). May–Jul [Online Interchange] {CNPS list}
Unabridged note: Stuckenia filiformis (Pers.) Börner subsp. filiformis not in California. Expanded author citation: Stuckenia filiformis (Pers.) Börner subsp. alpina (Blytt) R.R. Haynes, Les, & M. Král

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Citation for the whole project: Jepson Flora Project (eds.) 2013. Jepson eFlora,, accessed on Nov 25 2015
Citation for this treatment: [Author of taxon treatment] 2013. Stuckenia, in Jepson Flora Project (eds.) Jepson eFlora,, accessed on Nov 25 2015

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Geographic subdivisions indicated for the distribution of Stuckenia filiformis subsp. alpina 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.
map of distribution 1
(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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CCH collections by month

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