C. rubra

C. rubra may refer to:


 * Canna rubra, a garden plant
 * Cephalanthera rubra, the red helleborine, an orchid species found in Europe, north Africa and parts of Asia
 * Chionochloa rubra, the red tussock, a plant species endemic to New Zealand
 * Clathrina rubra, a sponge species
 * Claytonia rubra, the redstem springbeauty, a wildflower species
 * Crax rubra, the great curassow, a large black pheasant-like bird species