Commelina virginica
Commelina virginica, commonly known as the Virginia dayflower, is a perennial herbaceous plant in the dayflower family. It is native to the mideastern and southeastern United States, where it is typical of wet soils. While most members of the genus have thin, fibrous roots, the Virginia dayflower is relatively unique for its genus in having a perennial rhizome. The plant was first described by Carl Linnaeus in his 1762 publication of the second edition of "Species Plantarum". A phylogenetic study based on the nuclear ribosomal DNA region 5S NTS and the chloroplast region trnL-trnF, two commonly used  gene regions for determining relationships, suggested that "Commelina virginica" is most closely related to two African species, namely "Commelina capitata" and "Commelina congesta". However, the statistical support for this result was low. Morphologically speaking the supposedly related species do share some unique traits. "C. virginica" and "C. capitata" have red hairs at the top of their leaf sheaths, an unusual character in the genus, while "C. virginica" and "C. congesta" both have clustered inflorescences on very short stalks.