Boechera grahamii (Lehmann) Windham & Al-Shehbaz
Common Name: ROCK CRESS
Synonym: Arabis divaricarpa
Coefficient of Conservatism: 6
Coefficient of Wetness: 3
Wetness Index: FACU
Physiognomy: Nt B-Forb

Boechera grahamii N. Martineau

Arabis divaricarpa of Michigan Flora.

Sandy or gravelly clearings and borders of forests (especially aspen) and shores, rock outcrops and rocky summits.

The cauline leaves are usually numerous, short, and crowded, as in B. missouriensis, but the basal leaves are entire or slightly toothed and ± stellate-pubescent on both surfaces. The fruit is ordinarily widely spreading or even somewhat down-curved, up to 9.5 cm long, but on some plants the siliques are very short (ca. 2 cm), ascending on divaricate pedicels. Plants with very young fruit not displaying the strongly spreading aspect compared to the compact infructescence of Turritis glabra may be confused with the latter species, but differ in the shorter sepals and pink petals; in T. glabra, the pubescence at the base of the stem is generally denser, with more straight, spreading hairs. Apparently derived from a cross of the more western and northern B. collinsii and B. stricta.


Alpena County
Baraga County
Benzie County
Cheboygan County
Chippewa County
    Including Drummond Island
Delta County
Dickinson County
Emmet County
Ionia County
Iron County
Keweenaw County
    Including Isle Royale
Lake County
Leelanau County
Luce County
Mackinac County
    Including Bois Blanc, Mackinac, Round Islands
Marquette County
Menominee County
Oakland County
Ontonagon County
Oscoda County
Schoolcraft County


MICHIGAN FLORA ONLINE. A. A. Reznicek, E. G. Voss, & B. S. Walters. February 2011. University of Michigan. Web. July 7, 2022.