Cactus (Ariocarpus trigonus)
 Ariocarpus trigonus with stem just above ground level
© Nigel P. Taylor / Royal Botanic Gardens, Kew |  Ariocarpus trigonus in limestone
© Nigel P. Taylor / Royal Botanic Gardens, Kew |  Mature Ariocarpus trigonus in limestone
© Nigel P. Taylor / Royal Botanic Gardens, Kew |
 Ariocarpus trigonus and Obregonia denegrii
© Nigel P. Taylor / Royal Botanic Gardens, Kew |
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