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Montana Field Guide

Montana Field Guides

Common Hornwort - Ceratophyllum demersum


Global Rank: G5
State Rank: S5

Agency Status
USFWS:
USFS:
BLM:
MNPS Threat Rank:
C-value: 3

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General Description
Aquatic, perennial, monoecious herbs without roots. Stems flaccid, floating, up to 3 m. Leaves 3 to 11 per node, 7–30 mm long, forked into few linear, apiculate-toothed segments. Flowers unisexual, solitary in leaf axils; petals and sepals absent; involucre of 8 to 15 simple or forked, linear segments; stamens 3 to 50; pistil solitary. Fruit a 1-seeded achene, 4–6 mm long, narrowly elliptic and compressed with 1 terminal and two basal spines, shorter to much longer than the body (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Species Range
Present
 


Range Comments
Cosmopolitan, absent from the northernmost parts of N. America (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Summary of Observations Submitted for Montana
Number of Observations: 13

(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 to deep, fresh or brackish water of lakes, ponds, slow streams; plains, valleys (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

References
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Citation for data on this website:
Common Hornwort — Ceratophyllum demersum.  Montana Field Guide.  .  Retrieved on , from