. Carnegie Institution of Washington publication. ASTROPHYTUM. I83 Dr. C. A. Purpus who knows this species very well writes that it has two very different forms. The gray or grayish-white form grows near Torreon, in Cerro de la Bola, and in the mountains near Viesea, all in Coahuila. The more greenish lower form is abundant in the Sierra la Tabla, near Guascama or Minas de San Rafael, San Luis Potosi. It usually grows in the open mesa among broken stones, but is sometimes associated with other plants, such as Opuntia leptocaulis. Cereus inermis Scheidweiler (Bull. Acad. Sci. Brux. 61: 88. 1839
. Carnegie Institution of Washington publication. ASTROPHYTUM. I83 Dr. C. A. Purpus who knows this species very well writes that it has two very different forms. The gray or grayish-white form grows near Torreon, in Cerro de la Bola, and in the mountains near Viesea, all in Coahuila. The more greenish lower form is abundant in the Sierra la Tabla, near Guascama or Minas de San Rafael, San Luis Potosi. It usually grows in the open mesa among broken stones, but is sometimes associated with other plants, such as Opuntia leptocaulis. Cereus inermis Scheidweiler (Bull. Acad. Sci. Brux. 61: 88. 1839), usually referred here as a synonym, was never published. Echinocactus myriostigma hybridus is advertised by Haage and Schmidt, but we do not know its origin; the varieties, columnaris and nudus, are in the trade. Many hybrids are produced with this species as one of the parents. In 1896 (Monats- schr. Kakteenk. 6: 20) Fl. Radl* named and described twelve hybrids, while in 1907 Schellef (Handb. Kakteenk. 151, 152) listed 59 hybrid names under Ecliinocactiis myriostigma. Illustrations: Monatsschr. Kakteenk. 29:81; Gartenwelt 15: 537, as Echinocactus myriostigma columnaris; Lemaire, Icon. Cact. pi. 16; Schelle, Handb. Kakteenk. f. 78; Mollers Deutsche Gart. Zeit. 25:474. f. 6, No. 11; 486. f. 19; 29: 89. f. 11; Cycl. Amer. Hort. Bailey 2: 515. f. 746; Stand. Cycl. Hort. Bailey 2: f. 1374; Gardening 9: 617; Gard. Chron. III. 52: f. 103; Loudon, Encycl. PI. ed. 3. 1376. f. 19368; Bluhende Kakteen 2: pi. no; Engler and Prantl, Pflanzenfam. 360: f. 56, E; f. 62; Monatsschr. Kakteenk. 6: 22; 12: 4; 18: 9; 29:141; vSchumann, Gesamtb. Kakteen f. 1; Curtis's Bot. Mag. 71: pi. 4177; Gartenwelt 15: 537; 17: pi. opp. 412; Journ. Hort. Home Farm. III. 59: 631; De Laet, Cat. Gen. f. 16, 22 ; Watson, Cact. Cult. 112. f. 40; ed. 3. f. 27; Gard. Chron. III. 12: 789. f. 129, as Echinocactus myriostigma; Forster, Handb. Cact. ed. 2. 461. f. 54; Cact. T i r o a i_ s Tii tt a o Fig. 193.—Astroph
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