|Common Name:||Mile-a-minute (a.k.a. Minute weed, Mile-a-minute vine, Giant climbing tear-thumb)|
|Scientific Name:||Polygonum perfoliatum|
|Growth Form:||Herbaceous vine|
|Invasive Range:||Well established in
|Introduction:||The first occurrence of mile-a-minute weed resulting in the plants naturalization occurred in
|Description:||·Leaves: Alternate, simple, triangular, or sometimes heart-shaped. 3-8 cm (1.5-3 in.) long. Untoothed with abrasive margins. Light green, but can be red when young. Petioles are longer than leaf, have 1-2 mm spines, with leaf-like sheath where it meets the stem called ocrea.
·Stem: Green, branched, can grow up to 7 m in length (21 ft.). Can become woody with age. Have 1-2 mm spines. Red or brown at base.
·Flowers: Light green or yellow, rarely pink. 3-5 mm (0.25 in) long. Appear in 1-2 cm long spike that protrudes from ocrea. Present from July to August.·Fruit: Shiny black achene inside of metallic blue perianth resembling a berry. Present from September to November.
|Threats:||Mile-a-minute weed grows quickly, forming dense mats over existing vegetation, and inhibiting their ability to photosynthesize. It is especially bad for Christmas tree farms and nurseries because it can smother tree seedlings.|
|Fun Facts:||In traditional Chinese medicine, mile-a-minute weed is used as an anti-inflammatory and diuretic.|