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Montana Field Guide

Montana Field Guides

Eurasian Water-milfoil - Myriophyllum spicatum

Noxious Weed: Priority 2A
Aquatic Invasive Species
Exotic Species (not native to Montana)

Global Rank: GNR
State Rank: SNA

Agency Status
USFWS:
USFS:
BLM:
MNPS Threat Rank:
C-value: 0

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General Description
Stems branched, tawny when dry. Leaves 4- to 5-whorled, to 25 mm long, divided into 24 to 50 filiform segments. Bracts 1–3 mm long, smaller than fruits. Female flowers with a vestigial calyx and corolla; bracts entire to pectinate. Male flowers with small, deciduous, pink petals; bracts narrowly ovate, entire; stamens 8. Mericarps 2–3 mm long (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Species Range
Present
 


Range Comments
Introduced throughout N. America; native to Eurasia; reported for several counties (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Summary of Observations Submitted for Montana
Number of Observations: 8

(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

References
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Citation for data on this website:
Eurasian Water-milfoil — Myriophyllum spicatum.  Montana Field Guide.  .  Retrieved on , from