Japanese knotweed, more...
[Polygonum cuspidatum Siebold & Zucc., more]
Etymology: Fallopia: for Gabriello (Gabriele) Fallopia, 16th century Italian anatomist who discovered fallopian tubes
Plants: erect to arching, perennial, 4'-10' tall, stout, shrub-like forb; speading by the long rhizomes to form clones up to several acres; stems hollow, bamboo-like, round in cross section
Leaves: alternate, up to 6" long; broadly oval with pointed tip and a straight base
Flowers: white to greenish, 5-parted, petals and petal-like sepals; inflorescence of many 3"-6" branched clusters from the upper leaf axils
Fruits: dry, 3-angled seed
Habitat: shores, grasslands, woods
Invasiveness: Restricted Invasive - Eradicate!
Conservation Status: Introduced - persisting and spreading; ecologically invasive
Flora of North America: Flora of North America Floristic Rating: Wetland Indicator = FACU WIS DNR-Bureau of Endangered Resources: Detailed information on Wisconsin invasive species including decription, habitats, control methods Invasive And Exotic Species of North America: Descriptions, management issues, warnings, photos, etc. USDA Plants Database: Federal Distribution and detailed information including photos University of Wisconsin - Green Bay: Invasive Plants: Photos, descriptions, information Dan Tenaglia's The Missouri Flora: Fabulous photographs; detailed descriptions; color and leave arrangement key. Illinois Wildflowers: Wonderful photographs; detailed descriptions; color and leaf arrangement key Weeds Gone Wild: Alien Plant Invaders of Natural Areas: Descriptions, photos, management help, etc. Landscape Plants of the Upper Midwest; UW-Extension: Note: INVASIVE. Interactive guide providing information on cultivation including: soil, zone, growth rate, landscape uses, pruning, light requirements; with photos and Latin name pronounciation