In the vegetable kingdom we have a case of analogous variation, in the enlarged stems, or as commonly called roots, of the Swedish turnip and ruta-baga, plants which several botanists rank as varieties produced by cultivation from a common parent:
Botanikari batzuek, guraso komun batengandiko lanketaz sorturiko aldakitzat sailkatzen dituzte arbiok; hau horrela ez balitz, orduan bi espezie ezberdin deiturikotan izaniko aldakuntza analogoko kasua litzateke;