yellow `rebutia arenacea` cactus flower - sulcorebutia arenacea

america arboretum arenacea argentina argentinian aylostera bloom blossom bolivia bolivian botanic botanical botany cactaceae cacti cactus candiae cintia desert flora flower gallen garden glomeriseta green house houseplant leaf menesesii muschii natural nature orange petal plant prickly rebutia saint sharp south spine spiny succulent sulcorebutia swiss switzerland thorn thorny weingartia xanthoantha yellow