This naturalized annual was introduced from Asia and is considered a weed in Nebraska. This distinctive plant grows in colonies, usually on upright branches from reclining stems. The flowers have three petals, the upper two bright blue and about 1/2 inch across; the lower one is less prominent and whitish (A,B,C). The developing fruit is shown in image (D). Nothing in our area looks similar. A related plant, Erect Dayflower (Commelina erecta), is native to the Sandhills of Nebraska.
Grows in moist ravines and ditches, flowering from June through September. In Fontenelle Forest, common, for instance along Mormon Trail where it crosses the railroad tracks. At Neale Woods, common in Settlers Hollow.
The genus name was given by the famous 18th Century Swedish botanist Linnaeus to honor the three Commelin brothers, two of which were very prominent Dutch botanists. Like the third petal on this flower, the third brother was considered less prominent. Other common names include Asian Dayflower and Mouse Flower.
The content of NatureSearch is provided by dedicated volunteer Naturalists of Fontenelle Forest who strive to provide the most accurate information available. Contributors of the images retain their copyrights. The point of contact for this page is: Roland Barth.