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Western Water-milfoil - Myriophyllum hippuroides
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Not Documented Global Rank :
G5
State Rank :
SNA
(see State Rank Reason below)
C-value :
Agency Status USFWS :
USFS :
BLM :
External Links
State Rank Reason (see State Rank above)
Myriophyllum hippuroides is not documented with verified specimens in Montana (MTNHP Status Review in 2019). Myriophyllum hippuroides is an aquatic plant native to the west coast of North America, but introduced into several other states (Giblin et al. [eds.] 2018). It was reported at a Montana Department of Transportation wetland mitigation project along Rock Creek in Beaverhead County with no documentation and is likely to have been mis-identified. Proper identification of Myriophyllum species require careful collections to obtain flowering or fruiting structures, use of an appropriate and current taxonomic key, and concerted time to examine the specimen. Potential specimens should be provided to and verified at one of our State Herbaria (University of Montana, Montana State University, or Montana State University-Billings) and will likely require genetic testing. A conservation status rank is not applicable (SNA) because this plant is not known to occur in Montana.
General Description
PLANTS : Aquatic, perennials with finely dissected, whorled submerged leaves, and emerged leaves within the inflorescence. Stems may branch. Wintering buds (turions) are absent. Source: Giblin et al. [eds.] 2018.LEAVES : Submerged leaves are well-developed, in whorls of 3-6 with 5-28 leaf segments. Emerged leaves are well-developed (larger than the flowers or fruits), whorled, and occur within the inflorescence. Emerged leaves are narrowly lanceolate to narrowly oblong and abruptly transition upwards from the submerged leaves. At the base of branches or shoots are pinnate, whorled, and, mostly unreduced leaves. Emerged leaves dry to become dark green or black. Source: Giblin et al. [eds.] 2018.INFLORESCENCE : An emergent, terminal spike. The spike consists of separate male and female flowers and emerged leaves that are greater than the flowers and fruits. Source: Giblin et al. [eds.] 2018. See Reproductive Characteristics for distinguishing characteristics.
Diagnostic Characteristics
Proper identification of Myriophyllum Potential specimens should be provided to and verified at one of our State Herbaria :
Range Comments
Western Water-milfoil is native to the western coast of North America and introduced into Oklahoma, Texas, and Illinois (Jepson Flora Project [eds.] 2019; Giblin et al. [eds.] 2018).
Habitat
Sloughs, pools, lakes, and slow flowing streams (Giblin et al. [eds.] 2018).
Reproductive Characteristics
FLOWERS FRUITS
References
Literature Cited AboveLegend:
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