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Rootstalk
- a horizontal plant stem with shoots above and roots below serving as a reproductive structure
Rootstalks
- a horizontal plant stem with shoots above and roots below serving as a reproductive structure
Raceme
- usually elongate cluster of flowers along the main stem in which the flowers at the base open first
- INFLORESCENCE
Racemes
- usually elongate cluster of flowers along the main stem in which the flowers at the base open first
- INFLORESCENCE
Rhamnales
- an order of dicotyledonous plants
Rhamnaceae
- trees and shrubs usually thorny bearing drupaceous fruit many having medicinal value
Rhamnus
- type genus of the Rhamnaceae: buckthorns
Rhamnus Purshianus
- shrubby tree of the Pacific coast of the United States; yields cascara sagrada
Rhamnus Carolinianus
- deciduous shrub of eastern and central United States having black berrylike fruit; golden-yellow in autumn
Rhamnus Californicus
- evergreen shrub of western United States bearing small red or black fruits