Juniperus

The female cones are berry-like and dark bluish, often glaucous. The volatile oil they contain is the source of the distinctive flavor of gin. One often sees on Juniperus colorful orange galls caused by rust fungi of the genus Gymnosporangium, a widespread disease of apples and related plants.

1. Leaves in whorls of 3, all awl-like, articulated at the base, not decurrent; female cones on very short, scale-covered peduncles in the axils of awl-like leaves.

J. communis

1. Leaves mostly opposite, some or all scale-like (awl-like leaves when present often whorled but not articulated, decurrent at base); female cones apparently terminal on short, scale-covered peduncles borne on branchlets with scale-like leaves.

2. Erect small tree with central trunk, growing in southern Michigan; fruit on ± straight, ascending peduncles (or branchlets).

J. virginiana

2. Prostrate trailing shrub, growing in northern Michigan; fruit usually on ± arched or recurved peduncles.

J. horizontalis

All species found in Juniperus

Juniperus communisCOMMON JUNIPER, GROUND JUNIPER 
Juniperus horizontalisCREEPING JUNIPER 
Juniperus virginianaRED-CEDAR 

Citation:

MICHIGAN FLORA ONLINE. A. A. Reznicek, E. G. Voss, & B. S. Walters. February 2011. University of Michigan. Web. April 28, 2017. http://michiganflora.net/genus.aspx?id=Juniperus.