Amaranthus viridis L.
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.
Species Description - Monoecious; erect, to 1 m; lvs broadly ovate or rhombic- ovate, 3–7 cm, often retuse, acute or rounded at base; thyrses few or several, the lateral ascending, not much shorter than the terminal, forming a panicle 1–2 dm; bracts much shorter than the fls; sep of the pistillate fls 3, oblanceolate, shorter than the fr, acute; fr compressed-obovoid, 1.5 mm, very rugose when dry, indehiscent; seed orbicular, sharp-edged, 1 mm; 2n=34. Probably native to tropical Amer., now a pantropic weed and occasionally adventive in our range.