Echinocactus johnsonii Parry in Engelmann, Bot. Kings's Surv. 117. 1871.
Echinocactus johnsonii octocentrus Coulter, Contr. U. S. Nat. Herb. 3: 374. 1896.
Simple, oblong, 10 to 20 cm. high, up to 11.5 cm. in diameter, often hidden under its mass of spines; ribs 17 to 21, low, somewhat tuberculate; spines reddish gray; radial spines 10 to 14, spreading, 10 to 20 mm. long; central spines 4 to 8, longer and stouter than the radials, somewhat curved, the upper ones connivent, 3.5 to 4 cm. long; flowers deep red to pink, 5 to 6.5 cm. long, sometimes 10 cm. broad when fully expanded; inner perianth-segments oblong to spatulate, obtuse; ovary bearing a few broad, scarious, fimbriate, margined scales; fruit oblong, 10 to 15 cm. long, nearly naked; seeds finely reticulated.
Type locality: Near St. George, Utah.
Distribution: Northwestern Arizona, eastern California, western Utah, and southern Nevada.
This species was named for Joseph Ellis Johnson (18 17-1882), an amateur botanist of St. George, Utah, who, according to Professor Vasco M. Tanner, was once awarded a gold medal for having the best garden in the state of Utah.
Illustrations: Förster, Handb. Cact. ed. 2. 558. f. 71; Schelle, Handb. Kakteenk. 202. f. 134; Cact. Journ. 1: pl. 5; Deutsche Gärt. Zeit. 7: 53; Gartenflora 32: 8, as Echinocactus Johnsonii.
Figure 149 (single plants in foreground) is from a photograph taken by M. E. Jones at Searchlight, Nevada, April 1907.
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