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Milkwort Knotweed
( Polygonum polygaloides )
Polygonum polygaloides
More Photos at CalPhotos
More Info at Jepson eFlora
Calflora
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About Milkwort Knotweed (Polygonum polygaloides)
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Polygonum polygaloides
is a North American species of flowering plants in the buckwheat family known by the common names milkwort knotweed and polygala knotweed. It is native to much of western North America, where it can be found in many types of moist habitat. It is a variable species, usually divided into a number of subspecies.
Polygonum polygaloides
is an annual herb producing slender, wiry green stems 1 to 30 centimeters (0. 4-12 inches) in length. The linear or lance-shaped leaves are alternately arranged uniformly along the stem, the ones near the tips of stem branches highly reduced. The leaves have membranous stipules which fuse to form silvery ochrea at the leaf bases. The flowers are mainly located in clusters around the stem tips. They are white, pink, or red, and most remain closed. Subspecies. Some sources accept the following as subspecies of
Polygonum polygaloides
, while others regard all but subsp. polygaloides as belonging to a distinct species, P. kelloggii.
Polygonum polygaloides
subsp. confertiflorum (Nutt. ex Piper) J. C. Hickman - from British Columbia east to Saskatchewan and south as far as New Mexico
Polygonum polygaloides
subsp. esotericum (L. C. Wheeler) J. C. Hickman - California, Oregon
Polygonum polygaloides
subsp. kelloggii (Greene) J. C. Hickman - from British Columbia to Arizona
Polygonum polygaloides
subsp. polygaloides - Washington, Oregon, Idaho, Alberta, Montana, Wyoming
Plant Description
Plant Type
Annual herb
Size
0.36 - 11.8 in tall
Flower Color
Pink, White, Red
Wildlife Supported
Butterflies & moths hosted ( 26
likely
* )
SHOW ALL
*
Gray Hairstreak
Strymon melinus
Strymon melinus
*
Acmon Blue
Icaricia acmon
Icaricia acmon
*
Nivalis Copper
Lycaena nivalis
Lycaena nivalis
*
Lustrous Copper
Lycaena mariposa
Lycaena mariposa
*
Purplish Copper
Lycaena helloides
Lycaena helloides
*
Ruddy Copper
Lycaena rubidus
Lycaena rubidus
*
White-lined Sphinx
Hyles lineata
Hyles lineata
Landscaping Information
Natural Setting
Climate
Annual Precipitation: 9.5" - 151.6", Summer Precipitation: 0.51" - 5.67", Coldest Month: 20.1" - 49.4", Hottest Month: 40.1" - 74.4", Humidity: 0.42" - 21.93", Elevation: 122" - 12063"
Alternative Names
Common Names
: Polygala Knotweed
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Milkwort Knotweed
Polygonum polygaloides
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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