ARIOCARPUS. 



8l 



Type locality: San Luis Potosi, Mexico. 



Distribution: States of Coahuila, Zacatecas, and San Luis Potosi, Mexico. 



This species, as here described, is extremely variable in the shape, size, color, and 

 markings of the tubercles, and in the presence or absence of woolly areoles near the tips of 

 the tubercles. Several species have been described from these various forms, but there 

 seems to be no good ground for such a course. The plant is called chaute by the Mexicans. 



The plant usually grows in the open in rocky places where it is nearly covered with 

 broken stones and only its long tubercles are visible. 



Mammillaria retusa Mittler (Handb. Liebh. n) is referred here by Schumann, but we 

 have not seen this reference. 



Mammillaria abides Monville (Cat. 1846) is referred by Labouret as a synonym of 

 Anhalonium prismaticum, by Schumann as a synonym of Ariocarpus retusus, and by the 

 Index Kewensis as a synonym of Mammillaria prismatica. Anhalonium aloides pulvilli- 

 gerum Monville we know only from Lemaire (Illustr. Hort. 16: Misc. 72. 1869) who gives it 



Fig. 94. Ariocarpus retusus. 



Fig. 95. Ariocarpus fissuratus. 



as a synonym of A. pulvilligerum. Mammillaria pulvilligcra Monville (Forster, Handb. 

 Cact. ed. 2. 231. 1885) is given by Riimpler as a synonym of Anhalonium elongatum. 

 Mammillaria aloidaea pulviligera which appeared in Monville's Catalogue of 1846 is referred 

 by Labouret to Anhalonium elongatum. To Mammillaria trigona is referred Ariocarpus 

 trigonus by the Index Kewensis (Suppl. 2. 16. 1904). 



Illustrations: Mollers Deutsche Gart. Zeit. 29: 76. f. 5, 6; 77. f. 7, 8, as Ariocarpus 

 trigonus; Gartenwelt 15: 538, as Anhalonium trigonum; Gartenwelt 15: 538; Cact. Journ. 

 2: 109; Hort. Univ. 1: pi. 30; Bait. Cact. Journ. 2: 266. f. 1; Herb. Gener. Amat. II. 

 2: pi. 16; Arch. Exper. Path. 34: pi. 1, f. 2; Journ. Amer. Chem. Soc. 18: f. 5; Palmer, 

 Cult. Cact. 123; Garten-Zeitung 4: 541. f. 126; 182. f. 42, No. 16, as Anhalonium pris- 

 maticum; Curtis's Bot. Mag. 119: pi. 7279, as Mammillaria prismatica; Cact. Journ. 1 : pi. 

 for November; Rep. Mo. Bot. Gard. 9: pi. 34; Ann. Rep. Smiths. Inst. 1908: pi. 15, f. 2, 

 as Ariocarpus furfur aceus; Mollers Deutsche Gart. Zeit. 25: 477. f. n, No. 7; Bliihende 

 Kakteen 1: pi. 48; Ann. Rep. Smiths. Inst. 1908: pi. 15, f. 1 ; Bull. Acad. Sci. Brux. 5: pi. 1 ; 

 Rep. Mo. Bot. Gard. 9: pi. 35; Cact. Journ. 1: pi. for September and November; Schelle, 

 Handb. Kakteenk. f. 199; Hort. Beige 5: pi. 21, 22. 



Plate ix, figure 2, is from a photograph of a plant sent Dr. Edward Palmer from San 

 Luis Potosi, Mexico, in 1905, which afterwards flowered in Washington. Figure 94 is 

 from a photograph of a plant sent by Professor Lloyd from Zacatecas in 1908. 



