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Pennsylvania smartweed is a variable annual herb reaching 10 cm (3.9 in) to 2 m (6.6 ft) tall. The upright, ribbed stems are branching or unbranched. The lance-shaped leaves have a short petiole and a blade about 4–17 cm (1.6–6.7 in) long, sometimes up to 23 cm (9 in). The blade may be marked with a dark blotch.
Illustration from the Japanese agricultural encyclopedia Seikei Zusetsu (1804). Persicaria is a genus of herbaceous flowering plants in the knotweed family, Polygonaceae.Plants of the genus are known commonly as knotweeds [2]: 436 or smartweeds. [3]
Smartweed: Polygonum spp. Perennial 8 9 feral major F Selfheal: Prunella vulgaris: Perennial 7 8 no feral minor F Lungwort: Pulmonaria spp. Perennial 5 5 no feral minor F Appalachian mountain mint: Pycnanthemum flexuosum: Perennial 8 10 minor F Azalea: Rhododendron spp. Perennial 6 8 no ornamental minor F Russian sage: Salvia × floriferior ...
Smartweed: Polygonum spp. Aug – Sep Common Chickweed: Stellaria media: Apr – Jul minor source Germander: Teucrium chamaedrys: Jul – Aug Alsike Clover: Trifolium hybridum: yellow brown good source Crimson Clover: Trifolium incarnatum: dark brown White Clover: Trifolium repens: Jun – Jul caledonian brown good source Cat-tail: Typha ...
The Polygonaceae are a family of flowering plants known informally as the knotweed family or smartweed—buckwheat family in the United States. The name is based on the genus Polygonum , and was first used by Antoine Laurent de Jussieu in 1789 in his book, Genera Plantarum . [ 2 ]
Persicaria lapathifolia (syn. Polygonum lapathifolium), known as pale persicaria, [2] is a plant of the family Polygonaceae.It is considered to be native throughout most of the world, from arctic to tropical realms, except South America and Southern Africa. [3]
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Polygonum alpinum — alpine smartweed; Polygonum amphibium — water smartweed; Polygonum arifolium — halberd-leaf tearthumb; Polygonum bellardii — narrowleaf knotweed; Polygonum bistorta — meadow bistort; Polygonum bistortoides — American bistort; Polygonum boreale — northern knotweed; Polygonum buxiforme — Small's knotweed