The Callitrichaceae are an aquatic family of dicots that include the single, geographically cosmopolitan genus Callitriche. Calliltriche contains 40-50 terrestial, amphibious, and oligately submersed species, and it is the ...

Premise of the Study: Intraspecifi c variation among 20 populations of Podostemum ceratophyllum Michx. was investigated to test the hypothesis of range expansion from southern refugia since the last glacial maximum. Methods: ...