Pterocaulon pycnostachyum (Dense Spike Blackroot) is a species of perennial herb in the family Asteraceae. They have a self-supporting growth form. They are native to The Contiguous United States and Eastern North America. They have simple, broad leaves. Flowers are visited by Delta Flower Scarab, Great Golden Digger Wasp, Gray Hairstreak, and Protographium marcellus. Individuals can grow to 0.5 m.
EOL has data for 19 attributes, including: