Macdougal's Nipple Cactus
Scientific Name: Mammillaria heyderi ssp. macdougalii (Rose) D.R. Hunt
Synonym: Mammillaria gummifera var. macdougalii , Mammillaria heyderi var. macdougalii , Mammillaria macdougalii, Neomammillaria macdougalii
Family: Cactaceae
Mammillaria heyderi ssp. macdougalii in mid April
Sunset®: 8-24, 29, 30
USDA: 8-10
Frost Tolerance: Hardy to 18°F (-8°C)
Heat Tolerance: Light shade in summer in Phoenix
Sun Exposure: Full sun
Origin: Sonoran Desert: southern Arizona, northern Sonora, at 3500 to 5000 feet elevation (1050-1500 m)
Growth Habits: Globular, solitary or clumping, up to 5 to 6 inches in diameter (12-15 cm); milky sap; axils often woolly; young areoles woolly; 1 or 2 straight central spines, 0.4 inch long; 10 to 12 needle-shaped radials.
Watering Needs: Regular water in summer
Propagation: Seeds
This Mammillaria is protected in Arizona.
Blooming Habits:
Yellow or whitish flowers with pink mid-stripe, 1.2 inches in diameter, in May.
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