The Identification, Nomenclature, and Naturalized Distribution of Mazus miquelii (Mazaceae) in North America

Two species of Mazus (Mazaceae) are naturalized in North America, Mazus pumilus and Mazus miquelii. A new guide for distinguishing these species is provided. Comparisons of North American plants with the type specimen of the name M. miquelii and with specimens from the native range of that species support the inclusion of the naturalized plants sometimes called Mazus reptans in M. miquelii.