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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.
Other common names for the plant include pale smartweed, curlytop knotweed, and willow weed. It is a species complex made up of a great many varying forms, sometimes considered varieties. The environment also has a strong influence on the morphology of an individual plant.
Swamp smartweed is quite variable and is sometimes divided into several varieties, some of which may be better treated as species in their own right. [2] In general, swamp smartweed is a rhizomatous perennial herb growing upright or erect and approaching a maximum height of one meter (40 inches). Roots may emerge from nodes on the lower stem.
Persicaria maculosa is an annual herb up to 1 metre (3 ft 3 in) tall, [11] with an erect, rather floppy stem with swollen joints. The leaves are alternate and almost stalkless.
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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 ]