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Horned Pondweed - Zannichellia palustris
Native Species
Global Rank:
G5
State Rank:
S4
C-value:
8
Agency Status
USFWS:
USFS:
BLM:
External Links
General Description
Monoecious, rhizomatous, submersed, aquatic perennials. Stems filiform, branched 15–50 cm. Leaves mostly opposite, filiform, 2–10 cm long; stipules membranous, deciduous, 1–4 mm long. Inflorescence axillary cymes. Flowers unisexual, without a perianth; male flowers 1 stamen; female flowers of 4 or 5 pistils, distinct; ovaries superior. Fruits a curved-oblong, compressed, pedicellate achene 2–3 mm long with a curved beak 1–2 mm long (
Lesica et al. 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).
Species Range
Montana Range
Range Descriptions
Native
Range Comments
Cosmopolitan (Lesica et al. 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).
Observations in Montana Natural Heritage Program Database
Number of Observations: 1203
(Click on the following maps and charts to see full sized version)
Map Help and Descriptions
Relative Density
Recency
(Observations spanning multiple months or years are excluded from time charts)
Habitat
Shallow, fresh to alkaline water of ponds, lakes, ditches; plains, valleys, montane(
Lesica et al. 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).
Stewardship Responsibility
References
- Literature Cited AboveLegend:
View Online Publication- Lesica, P., M.T. Lavin, and P.F. Stickney. 2012. Manual of Montana Vascular Plants. Fort Worth, TX: BRIT Press. viii + 771 p.
- Additional ReferencesLegend: View Online Publication
Do you know of a citation we're missing?
Gillespie, D.M. 1966. Population studies of four species of mollusks in the Madison River, Yellowstone National Park. Ph.D. Dissertation. Bozeman, Montana: Montana State University. 43 p.- Lainhart, R.D. 1973. Interaction of substrate particle size and other habitat variables, and their relation to the microdistribution of benthos in a Montana spring-stream. Ph.D. Dissertation. Bozeman, Montana: Montana State University. 124 p.
- Lesica, P., M.T. Lavin, and P.F. Stickney. 2022. Manual of Montana Vascular Plants, Second Edition. Fort Worth, TX: BRIT Press. viii + 779 p.
- Rasmussen, S.M. 1968. Composition and structure of macrophyte vegetation of the Firehole River, Yellowstone National Park as related to physical and chemical factors. M.Sc. Thesis. Bozeman, MT: Montana State University. 44 p.
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