box knotweed, more...
[Polygonum aviculare var. littorale (Link) Mert., more]
Prostrate, freely branched and mat-forming, homophyllous annual; lvs oblong to oblanceolate, 3-20 נ1-8 mm; ocreae to 5 mm, hyaline-silvery distally; pedicels barely exsert; mature perianth 2-3 mm, divided to below the middle, the undivided part asymmetric, ventricose on one side, the segments greenish with white or pinkish margins; outer 3 segments cucullate; achenes 2-2.8 mm, included, dark brown, minutely striate-papillose, one side broader; late-season frs exsert, to 4.5 mm, olivaceous, smooth; 2n=60. Packed, nondrifting sands, borders of marshes and dunes, and sandy soils, both maritime and inland; rare but widespread in the U.S. and s. Can.
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.
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Citation: The vPlants Project. vPlants: A Virtual Herbarium of the Chicago Region. http://www.vplants.org
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