38 



THE CACTACEAE. 



Type locality: Not cited, but Riimpler states that the plant was collected by Galeotti 

 near Mineral del Monte, Hidalgo, in 1836. 



Distribution: Mexico, perhaps Hidalgo, but definite range unknown. 



Aulacothele sulcolanatum Monville (Lemaire, Icon. Cact. pi. 10. 1841-1847), referred 

 here as a synonym, seems never to have been published. 



Mammillaria retusa Scheidweiler is sometimes referred here also and the name has 

 priority over M. sulcolanata, but we are treating it as distinct. 



Echinocactus conimamma Linke was cited by Schumann (Monatsschr. Kakteenk. 5: 

 75. 1895) by mistake for Mammillaria conimamma Linke. M. conimamma wa/or is listed 

 by Haage (Cact. Kultur ed. 2. 179. 1900). 



The name Mammillaria sulcolanata macracantha (Walpers, Repert. Bot. 2: 273. 1843) 

 was without description. 



Illustrations: Haage, Cact. Kultur ed. 2. 178, as Mammillaria bumamma; Blanc, 

 Hints on Cacti 68. No. 1224, as Mammillaria elephantidens ; Lemaire, Icon. Cact. pi. 10; 

 Forster, Handb. Cact. ed. 2. 408. f. 45; Schelle, Handb. Kakteenk. 238. f. 154; Watson, 

 Cact. Cult. 178. f. 72; ed. 3. f. 49; Deutsche Gart. Zeit. 6: 65; Diet. Gard. Nicholson 4: 

 565. f. 40; Suppl. 518. f. 558, as Mammillaria sulcolanata; Mollers Deutsche Gart. Zeit. 

 255 475- f- 8, No. 2, as Mammillaria conimamma; Lemaire, Cactees 35. f. 2. 



Figure 35 is from a photograph of the plant collected by Dr. Rose near Pachuca in 1905. 



Fig. 36. — Coryphantha retusa. Fig. 37. — Coryphantha salm-dyckiana. 



22. Coryphantha retusa (Pfeiffer). 



Mammillaria retusa Pfeiffer, Allg. Gartenz. 5: 369. 1837. 

 Cactus retusus Kuntze, Rev. Gen. PI. i: 261. 1891. 



Plants depressed-globose, 5 to 10 cm. in diameter, the top very woolly ; tubercles rather large; 

 areoles elliptic; spines 6 to 12, all radial, appressed, or even curved backward, yellowish to brownish, 

 subulate, except 2 or 3 acicular ones at upper part of areoles; flowers central, yellow, about 3 cm. 

 long; inner perianth-segments oblong, acute. 



Type locality: Mexico. 

 Distribution: Oaxaca, Mexico. 



We have referred to this species a plant common in Oaxaca, which answers the original 

 description very well. It was collected by Pringle in 1894 (No. 5706) and by Conzatti in 



