Japanese knotweed |
Categories |
References |
Taxonomy |
Other Data Sources |
Scientific Name Synonyms |
Common Names |
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 5078027 Foliage David J. Moorhead |
 5078028 Infestation David J. Moorhead |
 0581040 Jil M. Swearingen |
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 0581041 Jil M. Swearingen |
 0581042 Jil M. Swearingen |
 0581043 Jil M. Swearingen |
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 0581044 Jil M. Swearingen |
 0581045 Jil M. Swearingen |
 0002108 Plant(s) Leslie Seiger |
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 0002121 Map Leslie Seiger |
 1539043 Infestation James H. Miller |
 1539044 Stem(s) James H. Miller |
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 1539045 Fruit(s) James H. Miller |
 1539046 Stem(s) James H. Miller |
 1539047 Flower(s) James H. Miller |
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 1539048 Stem(s) James H. Miller |
 1539049 Plant(s) James H. Miller |
 1539050 Plant(s) James H. Miller |
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 1539051 Flower(s) James H. Miller |
 1539052 Foliage James H. Miller |
 1539053 Plant(s) James H. Miller |
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 5379548 Flower(s) James H. Miller |
 5379549 Plant(s) James H. Miller |
 5379550 Flower(s) James H. Miller |
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 5379552 Flower(s) James H. Miller |
 5379562 Plant(s) James H. Miller |
 5421939 Flower(s) James H. Miller |
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 5421940 Flower(s) James H. Miller |
 5421941 Stem(s) James H. Miller |
 5421942 Infestation James H. Miller |
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 5421943 Foliage James H. Miller |
 5421944 Foliage James H. Miller |
 5421945 Plant(s) James H. Miller |
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 5421946 Stem(s) James H. Miller |
 5421947 Seedling(s) James H. Miller |
 5421948 Infestation James H. Miller |
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 5308058 Diagram or Graphic USDA PLANTS Database |
 1459283 Infestation Steve Dewey |
 1459284 Plant(s) Steve Dewey |
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 1459285 Plant(s) Steve Dewey |
 5331054 Infestation Randy Westbrooks |
 5331055 Flower(s) Randy Westbrooks |
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 5391724 Flower(s) Barry Rice |
 5391725 Plant(s) Barry Rice |
 5391726 Flower(s) Barry Rice |
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 5391727 Flower(s) Barry Rice |
 1196035 Infestation Michael Shephard |
 1196036 Plant(s) Michael Shephard |
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 1196128 Plant(s) Michael Shephard |
 1196129 Plant(s) Michael Shephard |
 1237055 Infestation Jack Ranney |
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 1237056 Foliage Jack Ranney |
 2308045 Infestation Leslie J. Mehrhoff |
 2308046 Foliage Leslie J. Mehrhoff |
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 5271079 Infestation Leslie J. Mehrhoff |
 5271080 Flower(s) Leslie J. Mehrhoff |
 5271081 Infestation Leslie J. Mehrhoff |
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 5271082 Fruit(s) Leslie J. Mehrhoff |
 5271083 Feature(s) Leslie J. Mehrhoff |
 5271084 Infestation Leslie J. Mehrhoff |
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Definition Japanese knotweed is a dense growing shrub reaching heights of 10 ft. (3 m). The semi-woody stem is hollow with enlarged nodes. Leaves are alternate, 6 in. (15.2 cm) long, 3-4 in. (7.6-10 cm) wide and broadly-ovate. Flowering occurs in late summer, when small, greenish-white flowers develop in long panicles in the axils of the leaves. Plants are dioecious (male and female flowers occur on separate plants). Japanese knotweed commonly invades disturbed areas with high light, such as roadsides and stream banks. Reproduction occurs both vegetatively (rhizomes) and seeds, making this plant extremely hard to eradicate. The dense patches shade and displace other plant life and reduce wildlife habitat. Japanese knotweed resembles giant knotweed (Polygonum sachalinense), but giant knotweed is larger and has heart-shaped leaves. Japanese knotweed is native to eastern Asia and was first introduced into North America in the late 1800s. |
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References Common Name Reference: Scientific Name Reference: |
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Categories Plants: Forbs/Herbs Plants: Vines |
Links to Other Data Sources Plants: FAJA2 Bayer: POLCU GRIN: 409771 |
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Taxonomic Synonyms Polygonum cuspidatum Siebold & Zucc. Reynoutria japonica Sieb. & Zucc. |
Other Common Names Common Name Synonym(s): fleeceflower, Japanese bamboo |
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