Echinocactus polycephalus var. polycephalus (Cottontop cactus)

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Echinocactus polycephalus Engelm. & J.M. Bigelow var. polycephalus

Cottontop cactus, cotton top cactus, biznaga de chilitos, harem cactus, many-headed barrel cactus, woolly-headed barrel cactus

Kingdom	Plantae	Plants, but not fungi, lichens, or algae
Subkingdom	Tracheobionta	Vascular plants—plants with a “circulatory system” for delivering water and nutrients
Division	Magnoliophyta	Flowering plants, also known as angiosperms
Class	Magnoliopsida	Dicotyledons—plants with two initial seed leaves
Subclass	Caryophyllidae	Cacti, many other succulents, carnivorous plants, and leadworts
Order	Caryophyllales	Includes cacti, carnations, amaranths, ice plants, and many carnivorous plants
Family	Cactaceae	Succulent (water-storing) plants, often spiny
Genus	Echinocactus	From echinos, “hedgehog or spine,” and cactus
Species	polycephalus	Many-headed
var.	polycephalus	Many-headed

About plant names...

This subspecies of the cotton top cactus is the most common, growing at the lower elevations of the Mojave and Sonoran deserts.

Identification: These cacti occurs in clumps of up to 30 stems, each of which are round or cylindrical, 12-24" (30-60 cm) high and 4-8" (10-20 cm) around. Each stem has 13-21 ribs, densely covered with spines in groups of 6-8. Yellow flowers have pink midribs, and are up to 1¾" (5 cm) around. Fruits are ⅜-¾" (1.2-2 cm) long, and covered with white hairs.