Synonyms: Eupatorium fruticosum; Eupatorium houstonianum (homotypic); Eupatorium houstonis (heterotypic); Mikania badieri f. badieri; Mikania badieri var. badieri; Mikania guatemalensis; Mikania houstoniana f. apodocephala; Mikania houstoniana f. houstoniana; Mikania houstoniana f. normalis; Mikania houstoniana guatemalensis; Mikania houstoniana var. guatemalensis; Mikania houstoniana var. santandrensis; Mikania houstoniana var. typica (homotypic); Mikania houstonis; Mikania sanjacacintensis; Willoughbya houstoniana (homotypic); Willoughbya houstonis