Western or intermediate dogbane (Apocynum floribundum) is considered to be the sporadic hybrid between hemp dogbane (Apocynum cannabinum), which forms tall patches along the Greenbelt, and spreading dogbane (Apocynum androsaemifolium), which occurs at higher elevations.  At least locally, however, western dogbane is now behaving as a species in its own right, forming extensive patches as the most abundant dogbane in the Boise Front.  We may even be witnessing an emerging species that is pre-adapted to the increasingly common novel habitat dominated by non-native grasses, where the western dogbane seems to thrive.