Sanguinary, common yarrow, Achillea millefolium.
Rumex sanguineus, bloody dock, wood dock, bloody-veined dock.
Capsella bursa-pastoris, shepherd's purse.
Any of the Haemodoraceae, a family of flowering plants some of whose roots contain a red dye.
The plant bloodroot, Sanguinaria canadensis.
Various species in the genus Sanguisorba, burnet.
The European green woodpecker.