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Photographs of three representative species of the woody Sonchus alliance in the Canary Islands. (a) Sonchus acaulis, a caudex perennial (photo credit: Seung-Chul Kim); (b) Sonchus canariensis, a tall shrub (photo credit: Seung-Chul Kim); (c) Sonchus webbii, a tuberous herbaceous perennial (photo credit: Aurelio Acevedo).
