Echinocactus bicolor var. schottii (Galeotti) Engelmann, Proc. Amer. Acad. 3: 277 (preprint 1856).
E. BICOLOR, Gal., var. SCHOTTII, E. in B. C. R.: ovatus; costis 8 obtusis interruptis; aculeis radialibus 15-17 rectis, summis 2-4 longioribus latioribus compressis, centralibus 4, summo latiore longiore; floribus majoribus purpureis.
Mier, on the Rio Grande : fl. September. — Plant 4-6 inches high, 2-3 in diameter; upper radial spines about 1 inch, upper central one 1 ½ inches long; lower radial and central spines reddish variegated. Flower 2-3 inches long, bright purple or rose-colored. — Distinguished from the Mexican E. bicolor, principally by the larger number of radial spines, and the greater length of the upper central spine, which is carinate underneath.
