| Rubia | type genus of the Rubiaceae |
|---|---|
| Rubia | perennial East Indian creeping or climbing herb used for dye in the orient |
| Rubia | Eurasian herb having small yellow flowers and red roots formerly an important source of the dye alizarin |
| Rubia | widely distributed family of mostly tropical trees and shrubs and herbs |
| Rubia | any of numerous trees or shrubs or vines of the family Rubiaceae |
| Rubia | an order of dicotyledonous plants of the subclass Asteridae |