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Pronunciation: ek-eye-no-KAK-tus pol-ee-SEF-a-lus
Common name: Cottontop cactus
Family: Cactaceae (Cactus)
Habitat: Rocky slopes and hills, silty valleys to 3000', creosote bush scrub, both deserts
Blooming period: March to May
Name derivations: 1) Echinocactus 2) polycephalus