Crocus flavus, the Dutch yellow crocus, a plant species found in Europe
Limax flavus, the yellow slug, an air-breathing land slug species
A Senecio and a diploid, Senecio vernalis is part of a species group along with S. flavus, S. gallicus, S. squalidus and S. glaucus who are widespread geographically and interesting for the study of genecology (the study of genetic differences in relation to the environment) and plant evolution.