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A leafless shrub from Uruguay and southern Brazil that grows slowly to 1.8 to 2.7 m tall with flattened 3 cm wide triangular spine tipped gray-green photosynthetic stems and small creamy white lightly fragrant flowers at the stem joints in late summer or fall. New growth has small leaves that are present only briefly. It thrives in full sun in a light to medium well-drained soil where it is drought tolerant. The genus name commemorates French botanist Philibert Collett.
Un arbusto sin hojas de Uruguay y el sur de Brasil, que crece lentamente hasta los 1.8 y 2.7 m de alto, contando con tallos aplanados, gris-verdes, fotosintéticos y espinas triangulares de 3 cm de ancho. Sus flores son pequeñas, de color blanco-crema, levemente fragantes y aparecen a fines de verano y comienzos de otoño. Los brotes presentan pequeñas hojas que desaparecen a la brevedad. Prospera a la luz directa en suelos livianos bien drenados donde es tolerante a las sequías. El nombre del género recuerda al botanista francés Philibert Collett.

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