Other names: Solanum ptycanthum, Black Nightshade, Eastern Black Nightshade
| Seeds of Solanum nigrum; see notes|
Fruit and plant could be confused with the non-native Black Nightshade, Solanum nigrum, which may be rare or unrecorded in Michigan. S. nigrum has duller fruit, and the flowers/fruit are racemiform (do not arise from a single point, as do S. ptychanthum, compare photo above to this photo of S. nigrum).
Seeds of S. nigrum are comma-shaped, while seeds of S. ptychanthum are rounder. They look similar to Lonicera seeds, but are very tiny.
- Species profile at USDA Plants Database
- Michigan Flora online species profile
- University of Wisconsin-Steven Point Robert. W. Freckmann herbarium species profile
- Weedy Wildflowers of Illinois species profile
- Ladybird Johnson Wildflower Center species profile
(Numbers in photo captions are photo credits, listed in the "Photo Credits" tab at the top of the page)