Colutea arborescens L.
Common Name: BLADDER SENNA
Coefficient of Conservatism: *
Coefficient of Wetness: 5
Wetness Index: UPL
Physiognomy: Ad Shrub

A shrub from southern Europe, occasionally grown for its large yellow flowers, followed by large inflated bladder-like fruits, very sparingly escaped into dry thickets and weedy banks. 

Collected spreading near the top of a west facing, open bluff below a cemetery in Washtenaw Co. by J. N. Kelly in 1987. Also known from adjacent Ontario and Ohio. A earlier collection from Muskegon Co. is without notation of whether wild or planted, and is not mapped, as also a more clearly cultivated Farwell collection from a cemetery in Houghton Co., in 1936.

A distinctive bushy shrub, often with numerous upright branches, to 3 m tall with pinnate leaves, rather like Robinia, but with the leaflet apex strongly emarginate with a tiny apiculus. The bladdery fruits are much larger and more conspicuous than the flowers.

Locations

Washtenaw County

Citation:

MICHIGAN FLORA ONLINE. A. A. Reznicek, E. G. Voss, & B. S. Walters. February 2011. University of Michigan. Web. October 26, 2020. https://michiganflora.net/species.aspx?id=2958.