2a. var. negundo
A. negundo var. violaceum (G. Kirchn.)
Jaeger
Twigs glabrous
or glaucous, green to olive green or appearing pale purple to purple. Ovaries
and fruits glabrous. 2n=26. April–May.
Common nearly
throughout Missouri (mostly eastern U.S.; Canada). Bottomland forests, banks
of streams, mesic upland forests in bottoms of ravines, and bases of bluffs;
also shaded ditches and moist roadsides.
Although the
separation of plants with glabrous vs. hairy twigs is relatively easy in Missouri material, there
exists a nearly continuous range of variation from trees with nonglaucous twigs
to those with grayish purple glaucousness on the twigs (sometimes separated as
var. violaceum). Glaucous specimens are scattered throughout the range
of the species in the state.