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Walker, Colin C.
(2018).
Abstract
Two rare endemic Bolivian cacti were observed in flower in the Duthie Park collection, Aberdeen. Vatricania guentheri produces a lateral cephalium that extends down the stem up to 50 cm in length from which the bell-shaped nocturnal flowers emerge. Cleistocactus reae is a little-known micro-endemic from the Bolivian Yungas. It has slender basally-branching stems up to 2 m tall with strawberry red straight flowers up to 7 cm long.