blackroot
nounEtymology From black + root.
› Several North American plants with black roots of:
1
genus Pterocaulon, such as Pterocaulon pycnostachyum (dense-spike blackroot) and Pterocaulon virgatum (wand blackroot)
2
species Veronicastrum virginicum (Culver's root)
3
species Aletris farinosa (colicroot)
4
Several plant diseases caused by fungi in the genus Aphanomyces causing that cause roots to rot and turn black.