Catalogue › FlowersBlackroot (Pterocaulon)Every species of the genus Pterocaulon in the catalogue.Fox-tail blackroot (Pterocaulon alopecuroidies)Dense-spike blackroot (Pterocaulon pycnostachyum)Wand blackroot (Pterocaulon virgatum)Wand blackroot (Pterocaulon alopecuroides)Wand blackroot (Pterocaulon rugosum)