Please try our next iteration of the Michigan Flora Online here. Beginning on February 1, 2023, 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.


1. Flowers in axillary clusters of 2–several, the ± ovate-acuminate bracts and floral tube pubescent; petals ca. 7–11 mm long.

L. salicaria

1. Flowers solitary in the axils of linear-lanceolate leaves or bracts, these and the floral tube glabrous; petals ca. 2–6.5 (–7) mm long.

2. Petals ca. 4–6.5 (–7) mm long; flowers borne in the axils of small linear bracts on the distal half of the plant, which bears larger leaves below.

L. alatum

2. Petals ca. 2–3 mm long; flowers borne all (or almost all) the way to the base of the plant in axils of small ± linear leaves.

L. hyssopifolia

All species found in Lythrum

Lythrum hyssopifoliaHYSSOP LOOSESTRIFE 
Lythrum salicariaPURPLE LOOSESTRIFE 


MICHIGAN FLORA ONLINE. A. A. Reznicek, E. G. Voss, & B. S. Walters. February 2011. University of Michigan. Web. January 29, 2023.