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.

Alismataceae

1. Pistils in a dense spherical head; uppermost flowers mostly staminate, with the stamens numerous; leaves unlobed or sagittate.

Sagittaria

1. Pistils in a single ring on a flattish receptacle or few in a tiny loose head; flowers all bisexual, with 6 (–9) stamens; leaves never lobed.

2. Plants nearly always more than 10 cm tall; achenes ca. 1.5–3 mm long, flattened.

Alisma

2. Plants less than 10 cm tall; achenes ca. 1–1.3 mm long, plump.

Echinodorus

Citation:

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