Button cactus (Coryphantha macromeris)
Description
Coryphantha macromeris usually forms groups of up to 15 centimeters high and 100 centimeters in diameter. The roots are meaty. The spherical to cylindrical, dark green to blue-green, occasionally gray-green with time, somewhat flabby fleshy shoots reach diameters of 4 to 8 centimeters growth heights of up to 23 centimeters. The up to 15 millimeters long, very prominent warts are conical to cylindrical. They have a delicate epidermis . The furrow on the warts extends from the tip only to half of the wart length. Sometimes the warts carry nectar glands. The one to four (rarely six) blackish, brown or gray middle spinesare bent, slightly bendable and 2.5 to 3.5 inches long. The nine to 15 slender, 1.6 to 2.5 centimeters long spines are white to brown.The bright pink or magenta flowers are 3 to 5 inches long and reach diameters of 4.5 to 7 centimeters. Their bracts are ciliated. The green fruits are up to 2.5 inches long.
Taxonomic tree
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Domain: Eukarya
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Kingdom: Plantae
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Phylum: Magnoliophyta
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Class: Magnoliopsida
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Order: Caryophyllales
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Family: Cactaceae
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Genus: Coryphantha
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