Commelinaceae

1. Corolla irregular, with a white petal distinctly smaller than the 2 blue ones; inflorescence subtended by a broad folded bract or spathe less than 3 cm long.

Commelina

1. Corolla regular, the petals of the same size and color; inflorescence subtended by narrow bracts 4–20 cm long, resembling the leaves.

Tradescantia

All species found in Commelinaceae

Commelina communisCOMMON DAY FLOWER 
Commelina erectaSLENDER DAYFLOWER 
Tradescantia bracteataLONG-BRACTED SPIDERWORT 
Tradescantia ohiensisCOMMON SPIDERWORT 
Tradescantia virginianaVIRGINIA SPIDERWORT 

Citation:

MICHIGAN FLORA ONLINE. A. A. Reznicek, E. G. Voss, & B. S. Walters. February 2011. University of Michigan. Web. June 18, 2018. https://michiganflora.net/family.aspx?id=COMMELINACEAE.