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Polygonum douglasii ssp. engelmannii

Polygonum douglasii Greene ssp. engelmannii (Greene) Kartesz & Gandhi

Engelmann's Knotweed

Polygonaceae (Buckwheat family)

Synonym(s): Polygonum douglasii var. microspermum, Polygonum engelmannii, Polygonum microspermum, Polygonum tenue var. microspermum

USDA Symbol: PODOE

USDA Native Status: L48 (N), CAN (N)

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Plant Characteristics

Duration: Annual
Habit: Herb
Fruit Type: Achene
Size Notes: Up to about 1 foot tall.

Bloom Information

Bloom Color: White , Green , Purple
Bloom Time: Jun , Jul , Aug , Sep
Bloom Notes: Greenish or sometimes purple, with white margins.

Distribution

USA: CO , ID , MT , NV , UT , WY
Canada: AB , BC
Native Habitat: Dry to moist sandy or well-drained soils, sagebrush desert to lower mountains.

National Wetland Indicator Status

Region:	AGCP	AK	AW	CB	EMP	GP	HI	MW	NCNE	WMVE
Status:			FACU			FACU				FACU

This information is derived from the U.S. Army Corps of Engineers National Wetland Plant List, Version 3.1 (Lichvar, R.W. 2013. The National Wetland Plant List: 2013 wetland ratings. Phytoneuron 2013-49: 1-241). Click here for map of regions.

Web Reference

Webref 3 - Flora of North America (2014) Missouri Botanical Garden, St. Louis, MO & Harvard University Herbaria, Cambridge, MA.
Webref 23 - Southwest Environmental Information Network (2009) SEINet - Arizona Chapter

Additional resources

USDA: Find Polygonum douglasii ssp. engelmannii in USDA Plants
FNA: Find Polygonum douglasii ssp. engelmannii in the Flora of North America (if available)
Google: Search Google for Polygonum douglasii ssp. engelmannii

Metadata

Record Modified: 2020-11-12
Research By: CBR

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