Any of various herbs of the genus Amaranthus.
A red to purple azo dye used as a biological stain, and in some countries in cosmetics and as a food colouring.
The characteristic purplish-red colour of the flowers or leaves of these plants.
The seed of these plants, used as a cereal.
Any coarse weedy herb.
An umbelliferous plant, of genus Heracleum, most species of which are phototoxic.
Certain plants from the genera Ambrosia, Erigeron, or Heracleum.