Humulus lupulus L.
Common Name: COMMON HOPS, HOP
Coefficient of Conservatism: 3
Coefficient of Wetness: 3
Wetness Index: FACU
Physiognomy: Nt P-Vine

Humulus lupulus B. S. Walters

Unlike H. japonicus, this species is a perennial vine, and consequently it persists and spreads long after cultivation at old homesites and similar places where it was once grown. Some of our records from floodplains, thickets, and lowlands doubtless represent native occurrences, but the original native range of hops in Michigan is obscure. Most of our records probably represent plants persistent or spread from cultivation: the Eurasian var. lupulus as defined by Small, with the main leaf veins beneath glabrous or sparsely pubescent. There is a gradation to our native varieties, which are not themselves clear-cut: var. pubescens E. Small has the midrib beneath densely pubescent and has hairs between the veins, such plants occurring in the southernmost Lower Peninsula; var. lupuloides E. Small is less pubescent, but not as glabrate as var. lupulus. Most plants of these varieties have on the midrib beneath a few of the broad-based, very short, stiff, 2-hooked barbs (“climbing hairs”), which are especially characteristic of the petioles.

Locations

Antrim County
Baraga County
Barry County
Benzie County
Berrien County
Cheboygan County
Chippewa County
Crawford County
Delta County
Dickinson County
Emmet County
Gogebic County
Gratiot County
Hillsdale County
Houghton County
Ingham County
Iron County
Jackson County
Kalamazoo County
Kent County
Leelanau County
    Including Fox Islands
    Including Manitou Islands
Lenawee County
Livingston County
Macomb County
Manistee County
Marquette County
Mason County
Mecosta County
Monroe County
Muskegon County
Newaygo County
Oakland County
Ontonagon County
Ottawa County
Saginaw County
Schoolcraft County
Van Buren County
Washtenaw County

Citation:

MICHIGAN FLORA ONLINE. A. A. Reznicek, E. G. Voss, & B. S. Walters. February 2011. University of Michigan. Web. December 18, 2017. http://www.michiganflora.net/species.aspx?id=715.