laevigatum Fern. Smartweed (Polygonum pensylvanicum) and closely related lady's thumb (P. persicaria) are a shade gardener's worst nightmare, because they grow best in moist partial shade.Found throughout North America, these native annuals produce thousands of hard-coated seeds. Polygonum punctatum. Usage Requirements. Sign up to get all the latest gardening tips! Growth Habit: Herb/Forb It is very similar to prostrate knotweed, except it grows in a more upright fashion and has more of an oval-shaped leaf. A Large Image of Polygonum pensylvanicum (Pennsylvania smartweed) from the USDA PLANTS database Before we discuss how to control smartweed, let’s take a look at a few key physical features that can help with smartweed identification. The leaves have smooth edges and sparse hairs on the surface. Persicaria pensylvanicum is known as smartweed. Pennsylvania smartweed is distributed throughout the United States. While this looks like it could be Pennsylvania smartweed, (Polygonum pensylvanicum or Persicaria pensylvanica), we are not certain and our natives specialist is out today. Penn State Hotlines The main focus of the EUNIS species component is to provide relevant information about the European species protected by Directives, Conventions and Agreements. + Expand All - Collapse Specimens and Distribution. Polygonum pensylvanicum) is a species of flowering plant in the buckwheat family, Polygonaceae. They serve an important purpose in a number of aspects. The most effective control methods focus on preventing the plants from producing seeds. Basionym: Polygonum pensylvanicum Linnaeus 1753. This species spreads by seed germinating in the early to late spring. Plant Characteristics. Polygonum pensylvanicum Polygonum pensylvanicum (L.) Small var. The swollen areas that separate the segments are called “knees,” and they are covered with pale green sheaths. This wild grain is an important food source for wildlife, but it becomes a noxious weed when it gets into garden plots and lawns. 362. Information and resources for the Ag Sciences community. Water the lawn as necessary and apply lawn fertilizer on a regular schedule. Add to Bookmarks. The rhizomes are white and thin; hence this weed is often called "shoestring". 1896. Cultivating the garden this spring resulted in a lot of these growing, along with henbit and others. Pennsylvania smartweed leaf. Smartweed ( Polygonum pensylvanicum) is an annual broadleaf. Pennsylvania Smartweed (Polygonum pensylvanicum) Polygonaceae - Buckwheat family © Daniel Reed. One of the first things you might notice is that the stems are divided into segments. leaf; conspicuous ocrea surrounding point where petiole meets stem Polygonum pensylvanicum L. Images from the web. The leaf bases form sheaths that surround the stem. Smartweed, also known as Polygonum hydropiperoides, is a plant that grows in low, wet environments throughout North and South America. ID Characteristics. 1753. Non-native: introduced (intentionally or unintentionally); has become naturalized. Polygonum pensylvanicum (L.) Small var. Polygonum pensylvanicum: Smartweed. , was named and described by Philip Miller in the fourth edition of Gardener’s Dictionary in 1754. Many common roadside weeds are more than just a nuisance. Smartweed leaves are shaped like lancets and may have purple blotches. Threat status Europe: Not evaluated (IUCN) The EUNIS species component has very limited information about this species. This species has been reported in the following counties by the herbaria listed. Also covers those considered historical (not seen in 20 years Description. Search this website. © Polygonum pensylvanicum of Michigan Flora.. 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