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A Reina de la Noche blossom at Tohono Chul Park on July 16, 2010.

The onset of the monsoon has brought one of Tucson's grandest sights: the flowering of the night-blooming cereus. Friday night, the flower is finally set to show its once-a-year beauty at Tohono Chul Park. Read more»

Tohono Chul Park will light up the night by transforming into a winter wonderland, complete with over 750,000 lights, entertainment, treats, and shopping. Read more»

A night-blooming cereus at Tohono Chul Park on Wednesday.

The 'Queen of the Night'—the night-blooming cereus cactus—is making its annual appearance at Tohono Chul Park. While some flowers opened Wednesday, others are expected to bloom Thursday night. Read more»

The Reina de la Noche, or Queen of the night, blooms at Tohono Chul Park on July 16, 2010.

Each summer, Tucsonans wait with growing anticipation for the monsoon season to kick in. Many also look forward to another event that sweeps in with the annual rains: the bloom night of the cereus cactus, or the "Reina de la Noche (Queen of the Night)." Read more»

The flowers of the 'Queen of the Night' stand out against the background of volunteers and staff who offered information about the plant.

The night-blooming cereus is a remarkable sight - one revered by those who live in the desert because the bloom is rarely seen. The "Queen of the Night" only flowers on a single night per year. Read more»

The long slow onset of the monsoon has delayed one of Tucson's grandest sights: the flowering of the night-blooming cereus. Friday night, the flower is finally set to show its once-a-year beauty. Read more»