Boechera retrofracta (Graham) Á. Löve & D. Löve
Common Name: ROCK CRESS
Synonym: Arabis holboellii
Coefficient of Conservatism: 10
Coefficient of Wetness: 5
Wetness Index: UPL
Physiognomy: Nt B-Forb

Boechera retrofracta flowers J. Morefield flowers

Arabis holboellii of Michigan Flora.

Sandy dune ridges; rock ledges and summits (northwestern Upper Peninsula and Isle Royale).

The basal leaves are ± densely stellate-pubescent, in tight rosettes. Vegetative rosettes at the ends of basal shoots are frequent, and the main stem often bears remnants of earlier rosettes at a lower level. On sand dunes, plants sometimes have a distinctive habit in that the rosettes are above the ground level.


Alpena County
Charlevoix County
    Only on Beaver Island
Cheboygan County
Chippewa County
    Only on Drummond Island
Emmet County
Keweenaw County
    Including Isle Royale
Leelanau County
    Including Manitou Islands
Mackinac County
    Only on Bois Blanc, Mackinac, Round Islands
Ontonagon County
Presque Isle County


MICHIGAN FLORA ONLINE. A. A. Reznicek, E. G. Voss, & B. S. Walters. February 2011. University of Michigan. Web. June 27, 2022.