Search Field Guide
Advanced Search
MT Gov Logo
Montana Field Guide

Montana Field Guides

Horned Pondweed - Zannichellia palustris

Image Copyright and Usage Information
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: 1201

(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).

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.
  • Web Search Engines for Articles on "Horned Pondweed"
Login Logout

Take us with you! PDF icon

Look for this PDF icon as you search and browse.  Click it to build a custom PDF with species shown on that page or for all the species within that taxonomic level.  To create your own list of species, use the PDF Creator tool at the bottom of the Advanced Search page.

Here's some links if you want to download a whole group.

Mammals
Birds
Reptiles
Amphibians
Fish
Invertebrates
Butterflies / Moths
Dragonflies / Damselflies
Ferns and allies
Conifers
Flowering Plants (Dicots)
Flowering Plants (Monocots)
Bryophytes
Lichens
Ecological Systems
Noxious Weeds
Citation for data on this website:
Horned Pondweed — Zannichellia palustris.  Montana Field Guide.  .  Retrieved on , from