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- Yellow pineIn ecology and forestry, yellow pine refers to a number of conifer species that tend to gr
- Yellow-green algaeClass of algae
- Yerba mateSouth American holly plant
- Yersinia pestisSpecies of bacteria, cause of plague
- Yucca elataYucca elata is a perennial plant, with common names that include soaptree, soaptree yucca,
- Yukon Gold potatoCultivar of potato