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Montana Field Guide

Montana Field Guides

Horned Pondweed - Zannichellia palustris

Native Species

Global Rank: G5
State Rank: S4

Agency Status
USFWS:
USFS:
BLM:
MNPS Threat Rank:
C-value: 8

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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 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Species Range
Present
 


Range Comments
Cosmopolitan (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Observations in Montana Natural Heritage Program Database
Number of Observations: 666

(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 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

References
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Citation for data on this website:
Horned Pondweed — Zannichellia palustris.  Montana Field Guide.  .  Retrieved on , from