Floral and reproductive biology of Commelina erecta L. (Commelinaceae) in a coastal dune system on the Gulf of Mexico

•Commelina erecta is andromonoecious and its hermaphrodite flowers are enantiostylous.•Floral morph ratios were different over the peak flowering.•Enantiostylous and male flowers were morphologically identical.•Augochlorela sp. was the most frequent visitor in flowers.•Fruit and seed set were similar in both hermaphroditic flowers.