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Pachycereus schottii

Pachycereus schottii (Engelm.) D.R. Hunt

Cereus schottii Engelm.

Lophocereus schottii (Engelm.) Britton & Rose

Señita Cactus, Old Man Cactus

Family: Cactaceae

About plant names...

Old man cactus is native to southwestern North America—Arizona, and Baja California and Sonora in Mexico.

Identification: Señita grows up to 12' (3.7 m) high, with stems 4-8" (10-20 cm) in diameter. Near the bottom of the columns, the areoles (bumps which produce the spines) are ¹/₁₆-³/₁₆" (3-5 mm) around, producing 1-15 spines ¹/₁₆-¼" (2.5-7.6 mm) long. On the upper part of the columns, areoles are ¼-½" (7.6-15 mm) around. Each areole includes 20-75 spines 1-4" (3-10 cm) long. It is these long, white, hairlike spines the give the cactus its common names. Flowers are cream-colored to bright pink, about 1½" (3.8 cm) across. Flowers usually bloom at night. Fruits are small, spiny red berries, which are edible. (Note: there is another old man cactus too!)

Online References:

Pachycereus schottii on Desert-tropicals.com

Pachycereus schottii at the Virginia Tech Department of Forest Resources and Environmental Conservation

Pachycereus schottii on CactiGuide.com

Pachycereus schottii at the Lady Bird Johnson Wildflower Center

Pachycereus schottii on Forest and Kim Starr’s Starr Environmental site

Pachycereus schottii at the Arizona Sonora Desert Museum Sonoran Desert Digital Library

Pachycereus schottii on eFloras

Pachycereus schottii (Señita Cactus, Old Man Cactus)

5/24/2009 · Arizona Sonora Desert Museum, Tucson, AZ
≈ 16 × 18" (41 × 45 cm)

Pachycereus schottii description by Thomas H. Kent, last updated 16 Aug 2013.

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Pachycereus schottii (Señita Cactus, Old Man Cactus)

5/24/2009 · Arizona Sonora Desert Museum, Tucson, AZ
≈ 3½ × 2½" (9.3 × 6.2 cm)

Pachycereus schottii (Señita Cactus, Old Man Cactus)

5/25/2009 · Boyce Thompson Arboretum, Superior, AZ
≈ 4½ × 6' (1.5 × 1.9 m)

Range: Zones 9-10:

About this map...