FEROCACTUS. 
125 
Echmocactus piliferus Demaire (Laboured, Monogr. Cact. 186. 1853) is usually referred 
here, but was not described in the place 
cited. 
Illustrations: Schumann, Gesamtb. 
Kakteen f. 52; Monatsschr. Kakteenk. 22 : 
39, Mollers Deutsche Gart. Zeit. 25 : 484. 
f. 16; Sehelle, Handb. Kakteenk. 147. f. 72; 
Gartenwelt 7 : 277, as Echinocactus pilosus; 
Rev. Hort. II. 4 : 1; Belg. Hort. 4 : pi. 2, as 
Echinocactus stainesii. 
Figure 128 is copied from the first 
illustration above cited. 
Figs. 129 and 130. — Flower and cluster of spines of 
Ferocactus pringlei. X0.5. 
Fig. 131.— Ferocactus pringlei. Fig. 131 a .— Ferocactus wislizeni. Natural size. 
2. Ferocactus pringlei (Coulter). 
Echinocactus pilosus pringlei Coulter, Contr. U. S. Nat. Herb. 3: 365. 1896. 
Echmocactus pringlei Rose, Contr. U. S. Nat. Herb. 10: 127. 1906. 
Growing in clumps, becoming cylindric, sometimes 3 meters high and 3 to 4 dm. in diameter; 
ribs usually 16 to 18, more or less compressed; areoles numerous, closely set or contiguous, the outer 
margin with a row of white or straw-colored hairs, 2 to 4 cm. long; spines red, various, the three 
lower ones slender, almost acicular, the innermost much stouter, somewhat flattened, angular, 
curved or nearly straight; flowers red without, yellow within, 2.5 cm. long; scales on the ovary 
numerous, orbicular, imbricated; inner perianth-segments oblanceolate, obtuse or apiculate; fruit 
yellow, somewhat succulent, dehiscing by a basal pore, 3 to 4 cm. long, crowned by the persisting 
perianth; seeds 1.5 mm. long, brownish, pitted, with a small basal hilum. 
