Commelina

1. Plants decumbent or creeping, with ovate leaf blades 2–4 times as long as wide; edges of blade of spathe free for entire length.

C. communis

1. Plants erect, with lanceolate or linear leaf blades 7–10 times as long as wide; edges of blade of spathe united at the base.

C. erecta

All species found in Commelina

Commelina communisCOMMON DAY FLOWER 
Commelina erectaSLENDER DAYFLOWER 

Citation:

MICHIGAN FLORA ONLINE. A. A. Reznicek, E. G. Voss, & B. S. Walters. February 2011. University of Michigan. Web. December 12, 2017. http://michiganflora.net/genus.aspx?id=Commelina.