Please try our next iteration of the Michigan Flora Online here. Beginning on February 1, 2023, michiganflora.net will point to this new site.

The new site offers several benefits over the existing website, including real coordinate mapping, giving a clearer view of the density of documentation as well as more precision about plant distributions and their link to landforms. We will also have the ability to update species pages more regularly, both in terms of new collections and as more existing Michigan specimens are georeferenced. In addition, we have a better photo display, and offer indented keys.

Rhamnaceae

1. Leaf blades with 3 prominent veins from the base; flowers white, in dense inflorescences at the ends of branches or on axillary peduncles; fruit dry, dehiscent.

Ceanothus

1. Leaf blades clearly pinnately veined, not strongly 3-nerved from the base; flowers yellow-green, solitary or numerous but all axillary; fruit fleshy, indehiscent.

2. Leaves entire (sometimes slightly undulate but at most irregularly crenulate); flowers all bisexual; sepals 5; petals 5; bud scales (actually the reduced leaves of naked buds) pubescent.

Frangula

2. Leaves with close, small, often crenulate teeth; flowers unisexual or bisexual (plants dioecious or polygamo-dioecious); sepals and petals 4, or sepals 5 and petals 0; bud scales glabrous except for the ciliate margins.

Rhamnus

Citation:

MICHIGAN FLORA ONLINE. A. A. Reznicek, E. G. Voss, & B. S. Walters. February 2011. University of Michigan. Web. January 29, 2023. https://michiganflora.net/family.aspx?id=RHAMNACEAE.