Oxalis rubra, the red woodsorrel or windowbox woodsorrel, a flowering plant species
Myrica rubra | Festuca rubra | Quercus rubra | Plumeria rubra | Halocaridina rubra | Vriesea rubra | Thelymitra rubra | Spergularia rubra | Sarracenia rubra | Pityriasis rubra pilaris | Oxalis rubra | Hypotrix rubra | Filipendula rubra | Alnus rubra |
Filipendula rubra, the queen-of-the-prairie, a medicinal and ornamental plant species native to the United States
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Festuca rubra, the red fescue, a grass species found worldwide
Hypotrix rubra, a moth species found from south-western New Mexico and south-eastern Arizona
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Halocaridina rubra, the ōpae ula in Hawaiian, a small shrimp species
Plumeria rubra, the red frangipani or common frangipani, a deciduous tree species
Sarracenia rubra, the sweet pitcher plant, a carnivorous plant species
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Spergularia rubra, a plant species native of Malta, Sicily and Algiers
Thelymitra rubra, the salmon sun orchid, an orchid species endemic to southeastern Australia
Vriesea rubra, a plant species native to Bolivia and Venezuela