Cactus Melocactus Small 271×320 Medium 542×640 Large 867×1024 Download Tiff Original 2032×2400 | (1.1 MB) Description Cactus melocactus has ten to twenty ribs. It has a round shape and grows eight inches tall. The flowers are red and slender. The fruit is crowned with the flower. Keywords cactus, cactus melocactus Galleries Cacti Source: L. H. Bailey Standard Cyclopedia of Horticulture (New York, New York: The MacMillan Company, 1917)