Spermatophytes (seed plants): Angiosperms (flowering plants): Eudicots: Core Eudicots: Saxifragales
WEAKLEY'S FLORA OF THE SOUTHEASTERN US (4/24/22):
Myriophyllum spicatum
FAMILY
Haloragaceae
Go to FSUS key
Dig deeper at SERNEC, a consortium of southeastern herbaria.
Check out EDDMapS.org to see where this has been reported.
Learn more about Eurasian Water-milfoil from the Vascular Plants of North Carolina.
Easily confused with M. sibiricum, M. spicatum is an introduced species, now widespread in the eastern US, per Weakley's Flora (2022)
SYNONYMOUS WITH
PLANTS NATIONAL DATABASE:
Myriophyllum spicatum
FAMILY
Haloragaceae
SYNONYMOUS WITH Flora of North America
Myriophyllum spicatum
COMMON NAME:
Eurasian Water-milfoil
To see larger pictures, click or hover over the thumbnails.
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USDA-NRCS PLANTS Database / Britton, N.L., and A. Brown. 1913 pnd_mysp2_001_lvd
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USDA / Selected Weeds of the US. 1970 swus_page_277
)
)
Leslie J. Mehrhoff, University of Connecticut, Bugwood.org bug_5273022
Month Unknown
Leaves in distinct whorls of 4, often looking as if their ends were cut off square w scissors, per Vascular Plants of North Carolina.
)
Steve Hurst, USDA NRCS PLANTS Database, Bugwood.org bug_5308029
Month Unknown
)
Chris Evans, Illinois Wildlife Action Plan, Bugwood.org bug_5330057
Month Unknown
Stem diameter below inflorescence is up to 2x diameter of lower stem, per Weakley's Flora (2022).
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Graves Lovell, Alabama Dept. of Conservation & Natural Resources, Bugwood.org bug_5400611
Month Unknown
All leaves whorled, grayish green. Midstem leaves with 12-25 segments on each side of rachis, per Weakley's Flora (2022).
COMPARE
aquatic plants
)
Leslie J. Mehrhoff, University of Connecticut, Bugwood.org bug_5447204
Month Unknown
)
Leslie J. Mehrhoff, University of Connecticut, Bugwood.org bug_5447206
Month Unknown
Flowers/fruits in erect spikes emersed from water, per Weakley's Flora (2012).
WEAKLEY'S FLORA OF THE SOUTHEASTERN US (4/24/22):
Myriophyllum spicatum
FAMILY
Haloragaceae
SYNONYMOUS WITH
PLANTS NATIONAL DATABASE:
Myriophyllum spicatum
FAMILY
Haloragaceae
SYNONYMOUS WITH
Flora of North America
Myriophyllum spicatum
965
Submersed aquatic w flowers & fruits above the surface (rooted); Forb
Perennial
Usually monoecious
Habitat: Ponds and impoundments, per Weakley's Flora
Non-native: Eurasia
Uncommon in NC Coastal Plain (rare elsewhere in GA-NC-SC)
CLICK HERE to see a map, notes, and images from Weakley's Flora of the Southeastern US.
This plant is causing problems in natural areas outside its native range, according to authorities such as:
- Alabama Invasive Plant Council, 2012
- Georgia Exotic Pest Plant Council, 2006
- SC Department of Natural Resources Aquatic Nuisance Species List, 2003
- SC List of Regulated Pest Plant Species, 2017
- Tennessee Exotic Pest Plant Council, 2009
- US Fish & Wildlife Service
- Virginia Department of Conservation and Recreation, 2014
LEAVES:
Leaves well-developed: pinnately divided with filiform segments
Submersed leaves whorled. Bracts of emersed shoots different than submersed lvs
FLOWER:
Spring/Summer/Fall
Reddish
4 sepals
4 petals
8 stamens
Inferior ovary
Unisexual (rarely bisexual)
Flowers in spikes
FRUIT:
Spring/Summer/Fall
Schizocarp of mericarps
TO LEARN MORE about this plant, look it up in a good book!
- Field Guide to Aquatic Plants of Alabama (Lovell, 2007) p45
- Invasive Plants, Guide to Identification, Impacts and Control (Kaufman & Kaufman, 2007) p432
- Field Guide to the Rare Plants of Georgia (Chafin, 2007) p233
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