Jepson eFlora: Taxon page
Vascular Plants of California
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Stuckenia pectinata
FENNEL-LEAF 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.
Unabridged Reference: Börner 1912 Botanisch-systematische Notizen. Abh. Naturwiss. Vereine Bremen 21:245--282; Holub 1977 Preslia 69:361--366
Stuckenia pectinata (L.) Börner
NATIVE
Habit: 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.
Ecology: Common. Ponds, lakes, marshes, streams; Elevation: < 2400 m. Bioregional Distribution: CA; Distribution Outside California: worldwide. Flowering Time: May--Jul Note: Often weedy in reservoirs, irrigation canals; important food for waterfowl.
Synonyms: Coleogeton pectinatus (L.) Les & R.R. Haynes; Potamogeton pectinatus L.
Jepson eFlora Author: C. Barre Hellquist, Robert F. Thorne & Robert R. Haynes
Unabridged Reference: Börner 1912 Botanisch-systematische Notizen. Abh. Naturwiss. Vereine Bremen 21:245--282; Holub 1977 Preslia 69:361--366
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Botanical illustration including Stuckenia pectinata

botanical illustration including Stuckenia pectinata

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Citation for this treatment: C. Barre Hellquist, Robert F. Thorne & Robert R. Haynes 2012, Stuckenia pectinata, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/eflora/eflora_display.php?tid=80429, accessed on August 18, 2019.

Citation for the whole project: Jepson Flora Project (eds.) 2019, Jepson eFlora, http://ucjeps.berkeley.edu/eflora/, accessed on August 18, 2019.

Stuckenia pectinata
click for enlargement
© 2018 Neal Kramer
Stuckenia pectinata
click for enlargement
© 2018 Neal Kramer
Stuckenia pectinata
click for enlargement
© 2018 Neal Kramer
Stuckenia pectinata
click for enlargement
© 2018 Neal Kramer
Stuckenia pectinata
click for enlargement
© 2018 Neal Kramer

More photos of Stuckenia pectinata in CalPhotos



Geographic subdivisions for Stuckenia pectinata:
CA
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CCH collections by month

Duplicates counted once; synonyms included.
Species do not include records of infraspecific taxa, if there are more than 1 infraspecific taxon in CA.
Blue line denotes eFlora flowering time.