2a. var. lupulus
H. americanus Nutt.
Stems relatively
sparsely hairy at the nodes. Leaf blades tending to have fewer lobes, those of
the larger leaves unlobed or more commonly 3-lobed, all of the leaves with 3
main veins from the base, the undersurface sparsely to moderately pubescent
along the veins, glabrous between them, the midvein with mostly fewer than 20
hairs per cm, also moderately glandular with stalked glands, the surface
between the veins mostly with fewer than 25 glands per square cm. July–October.
Introduced,
uncommon and widely scattered in the state (native of Europe; introduced in the
northeastern U.S. west to Wisconsin and Missouri, disjunct in California and
possibly Oregon; Canada, Asia). Banks of streams; also railroads and disturbed
areas.
This variety was
cultivated widely in the eastern United States from the 1600s to the
Prohibition era, and many of the herbarium collections from the northeastern
United States are said to be of this variety (Small, 1978).