Sentence:  "Four species of the <WSD>nominotypical</WSD> subgenus are positively recorded from America north of Mexico..." [referring to "Physonota (Physonota) arizonae" and three other species] 
Meaning of the word marked with <WSD> tags:  Of a subgenus or other infrageneric taxa, having a name which repeats the genus name, indicating that it includes the type species. For older botanical subgeneric and sectional names, it is sometimes prefixed with "Eu-".