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Stuckenia filiformis subsp. alpina
SLENDER-LEAVED PONDWEED

Higher Taxonomy
Family: PotamogetonaceaeView DescriptionDichotomous Key

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.
Genus: StuckeniaView DescriptionDichotomous Key

Common Name: PONDWEED
Habit: 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. Chromosomes: x=13.
Species In Genus: +-7 species: worldwide.

Stuckenia filiformis (Pers.) Börner subsp. alpina (Blytt) R.R. Haynes, Les, & M. Král
NATIVE
Habit: 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. Chromosomes: 2n=66.
Ecology: Shallow, clear water of lakes, drainage channels; Elevation: 300--2150 m. Bioregional Distribution: KR, c SNH, GV, CCo, SnFrB, GB; Distribution Outside California: to Alaska, Arizona, Greenland, Eurasia. Flowering Time: May--Jul Note: Unrecognized subsp. under Potamogeton filiformis in TJM (1993).
Synonyms: 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
Unabridged Note: Stuckenia filiformis (Pers.) Börner subsp. filiformis not in California.
eFlora Treatment Author: C. Barre Hellquist, Robert F. Thorne & Robert R. Haynes
Jepson Online Interchange
Listed on CNPS Rare Plant Inventory

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Citation for this treatment: C. Barre Hellquist, Robert F. Thorne & Robert R. Haynes 2016. Stuckenia filiformis subsp. alpina, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/cgi-bin/get_IJM.pl?tid=80318, accessed on April 29, 2016.

Citation for the whole project: Jepson Flora Project (eds.) 2016. Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html, accessed on April 29, 2016.


Geographic subdivisions for Stuckenia filiformis subsp. alpina:
KR, c SNH, GV, CCo, SnFrB, GB;
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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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.