Persicaria amphibia
(Water Knotweed)
Persicaria amphibia, Black Powder Pass, Summit Co. 4915
Persicaria amphibia, Georgia Pass, Summit Co. 0137
| Scientific Name | Persicaria amphibia (Polygonum amphibium) | USDA PLANTS Symbol | POAME |
| Common Name | Water Knotweed, Water Smartweed | ITIS Taxonomic Serial No. | 823854 |
| Family | Polygonaceae (Buckwheat) | SEINet Reference |
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| Description |
Life zones and habitat: Plains to subalpine (3500 to 10700 ft.); lake edges; amphibious plant may occur in water or on land in wet areas. Plant: Terrestrial plants have erect to decumbent and densely hairy stems and leaves with sharp-pointed tipped leaf blades; aquatic plants have hairless stems and blunt-tipped leaves. Leaves: Alternate, ovate-lanceolate to elliptic, leathery green stem leaves with tips as above; 3/4 to 6 inches long and 3/8 to 2-3/8 inches wide. Inflorescence: Terminal racemes 3/8 to 6 inches long of many small flowers with bright pink to red tepals. Bloom Period: Summer. References: "Flora of Colorado" by Jennifer Ackerfield and US Forest Service article by Walter Fertig. |
BONAP Distribution Map Map Color Key |
Colorado Status: Native |
© Tom Lebsack 2025
Banner photo: Castilleja rhexifolia and a brewing storm over the San Juan Mountains
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