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 aloides 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 pulviili- 
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 pulvilligera 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; Balt. Cact. Joum. 2: 266. f. 1; Herb. Gener. Amat. II. 
2: pi. 16; Arch. Exper. Path. 34: pi. 1, f. 2; Joum. 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 furfuraceus; 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. Joum. 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. 
