scouring rush —  Equisetum hyemale affine {horsetail family — Equisetaceae}
Flora of the Yukon Territory, Cody, p. 029a
 { 1/30 sec, f16.0} – {McIntyre Ck. college, Whitehorse, Yukon} – {11/08/09 Tuesday, August 11, 2009; 4:39:45 PM}