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Cutleaf Water-milfoil - Myriophyllum pinnatum
Other Names:
Cutleaf Watermilfoil
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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 pinnatum is not documented with verified specimens in Montana (MTNHP Status Review in 2018). In North America its range is reported in southern British Columbia to Oregon and in eastern North America (Giblin et al. [eds.] 2018). In Montana aquatic plant surveys conducted in 2011 at Cliff Lake, Wade Lake, and Red Rock River reported the plant, but researches provided conflicting information on its identity and specimens have not been found. 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 6-13 segments, but usually with some alternately arranged as well. Emerged leaves are well-developed (larger than the flowers or fruits), whorled, linear, lanceolate, narrowly oblong, elliptic, or ovate in shape, and occur within the inflorescence. Plants may have at the base of branches or shoots pinnate, whorled, and, mostly unreduced leaves. Source: Giblin et al. [eds.] 2018.INFLORESCENCE : An emergent, terminal spike. The spike consists of separate male and female flowers and emergent leaves. Emergent leaves are greater than the flowers and fruits. Emergent leaves within the upper half of the inflorescence are either a) pinnately divided or lobed more than half-way to midvein or b) entire to toothed. Source: Giblin et al. [eds.] 2018.
Diagnostic Characteristics
Proper identification of Myriophyllum Potential specimens should be provided to and verified at one of our State Herbaria :
Range Comments
It is reported to occur in southern British Columbia to Oregon and in eastern North America (Giblin et al. [eds.] 2018). The NRCS PLANTS database shows this plant occurring in the eastern and mid-western US States and in British Columbia and Saskatchewan, Canada (https://plants.usda.gov
Habitat
Lakes, sloughs, ditches, and slow streams (Giblin et al. [eds.] 2018).
Reproductive Characteristics
FLOWERS FRUITS
References
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