PlantsFlowering PlantsKnotweed FamilyKnotweeds & Smartweeds — Genus Polygonum
Herb or twining vine. Stem nodes often enlarged. Leaves alternate, simple, with a sheath around the base of each leaf petiole.
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Water Smartweed —  Polygonum amphibium [1,2]
Tepals pink. Flowering Jun-Oct.
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Oval-leaf Knotweed —  Polygonum arenastrum [1]
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Silversheath Knotweed —  Polygonum argyrocoleon [1]
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Prostrate Knotweed —  Polygonum aviculare [1]
Tepals 5, greenish with white/pink margins. Flowering May-Nov.P. buxiforme is a synonym for P. a. buxiforme.
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Oriental Lady's Thumb —  Polygonum cespitosum [1]
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Dull-seed Cornbind —  Polygonum convolvulus [1,2]
Vine without tendrils. Tepals greenish, sometimes with purple spots. Flowering Apr-Sep.
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Erect Knotweed —  Polygonum erectum [1]
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Denseflower Knotweed —  Polygonum glabrum [1]
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Marshpepper Knotweed —  Polygonum hydropiper [1]
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Swamp Smartweed —  Polygonum hydropiperoides [1]
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Fringed Knotweed —  Polygonum lacerum [1]
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Willow Smartweed —  Polygonum lapathifolium [1,2]
Tepals pinkish/white. Flowering Apr-Dec.
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Branched Tearthumb —  Polygonum meisnerianum [1]
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Kiss Me Over The Garden Gate —  Polygonum orientale [1]
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Pennsylvania Smartweed —  Polygonum pensylvanicum [1]
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Spotted Ladysthumb —  Polygonum persicaria [1]
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Water Smartweed —  Polygonum punctatum [1]
Tepals greenish-white. Flowering Feb-Dec.
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Bushy Knotweed —  Polygonum ramosissimum [1]
Tepals 6. Flowering Jun-Nov.
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Stout Smartweed —  Polygonum robustius [1]
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Arrowleaf Tearthumb —  Polygonum sagittatum [1]
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Thicket Knotweed —  Polygonum scandens [1]
Vine. Flowering Aug-Oct.
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Knotweed —  Polygonum setaceum [1]
Flowering Jun-Oct.
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Striped Knotweed —  Polygonum striatulum [1]
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Pleatleaf Knotweed —  Polygonum tenue [1]
Jumpseed
Jumpseed —  Polygonum virginianum [1,3]
Tepals 4, stamens 4(-8). Flowering Jul-Oct.
Evidence that species is found in Texas:
  1. USDA Plants Database, advanced search for Texas plants from the United States Department of Agriculture.
  2. Atlas of the Vascular Plants of Texas, Volume 1, B.L. Turner, Holly Nichols, Geoffrey Denny and Oded Doron, Botanical Research Institute of Texas (BRIT), Fort Worth, Texas, 2003.
  3. Rick's iNaturalist observations, nature observations of Richard K. Murphy. Identifications are not necessarily confirmed by other users.