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 Eastern North America and The Contiguous United States. They have simple, broad leaves. Flowers are visited by queen, Horace's Duskywing, Eurytides marcellus, and Delta Flower Scarab. Individuals can grow to 0.5 m.
EOL has data for 17 attributes, including: