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Bushy Knotweed
Polygonum ramosissimum
  
About Bushy Knotweed (Polygonum ramosissimum) 0 Nurseries Carry This Plant Polygonum ramosissimum is a North American species of herbaceous annual plants in the buckwheat family, widespread across much of Canada and the United States, where it is commonly called bushy knotweed. Polygonum ramosissimum has erect stems growing 30 to 100 cm (12 to 39. 5 in) (sometimes to 200 cm or 80 inches) tall, with yellowish-green to blue-green foliage. The stems are freely branched with closed flowers produced in groups of (1) 2 to 3(5) flowers in the upper ocreae of racemes that are up to 15 cm (6 in) long, the inflorescences are spike-like. The greenish-yellow, rarely pink or white marked flowers, are on pedicels that are longer than the calyx. The calyx is around 3 mm (0. 12 in) long and 5-parted with the outer three sepals longer than the inner sepals. The seeds are produced in fruits called achenes, which are egg-shaped, dark brown and around 3 mm (0. 12 in) long. The achenes also have a smooth shiny surface. The late season achenes are larger, from 4 to 15 mm long. Polygonum ramosissimum has erect stems growing 30 to 100 cm (12 to 39. 5 in) (sometimes to 200 cm or 80 inches) tall, with yellowish-green to blue-green foliage. The stems are freely branched with closed flowers produced in groups of (1) 2 to 3(5) flowers in the upper ocreae of racemes that are up to 15 cm (6 in) long, the inflorescences are spike-like. The greenish-yellow, rarely pink or white marked flowers, are on pedicels that are longer than the calyx. The calyx is around 3 mm (0. 12 in) long and 5-parted with the outer three sepals longer than the inner sepals.
Plant Description
Plant Type
Plant Type
Annual herb

Size
Size
1 - 6.6 ft tall

Flower Color
Flower Color
Yellow, Green

Wildlife Supported
 


 
Butterflies & moths hosted ( 23 likely * ) SHOW ALL

Landscaping Information
Natural Setting
Climate
Climate
Annual Precipitation: 2.6" - 51.8", Summer Precipitation: 0.17" - 1.84", Coldest Month: 30.1" - 59.2", Hottest Month: 59.6" - 88.6", Humidity: 0.37" - 40.49", Elevation: -185" - 6770"


Sources include: Wikipedia. All text shown in the "About" section of these pages is available under the Creative Commons Attribution-ShareAlike License. Plant observation data provided by the participants of the California Consortia of Herbaria, Sunset information provided by Jepson Flora Project. Propogation from seed information provided by the Santa Barbara Botanical Garden from "Seed Propagation of Native California Plants" by Dara E. Emery. Sources of plant photos include CalPhotos, Wikimedia Commons, and independent plant photographers who have agreed to share their images with Calscape. Other general sources of information include Calflora, CNPS Manual of Vegetation Online, Jepson Flora Project, Las Pilitas, Theodore Payne, Tree of Life, The Xerces Society, and information provided by CNPS volunteer editors, with special thanks to Don Rideout. Climate data used in creation of plant range maps is from PRISM Climate Group, Oregon State University, using 30 year (1981-2010) annual "normals" at an 800 meter spatial resolution.

Links:   Jepson eFlora Taxon Page  CalPhotos  Wikipedia  Calflora


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