CORYPHANTHA. 



37 



lowish, 10 to 12 mm. long, rigid, tomentose when yomig; flowers lemon-yellow, with outer segments 

 tinged with red, about lo cm. broad, the segments narrowly oblong to spatulate, acute, somewhat 

 toothed toward the apex. 



Type locality: Mexico. 



Distribution: Central Mexico. 



It is difficult to ascertain what the true Mammillaria radians of De CandoUe really is. 

 The type plant was described from specimens collected by Thomas Coulter, probably in 

 eastern Mexico. We believe that specimens collected by Dr. Edward Palmer near San 

 Luis Potosi, Mexico, represent the species as well as any plants we have yet seen; these, 

 however, are cespitose as well as solitary. The species seems nearest Coryphantha compacta. 



Cactus radians pectinoides Coulter, based on Eschanzier's plant from San Luis Potosi 

 (1891), we have not seen but suspect that it belongs here. 



Fig. 34. — Coryphantha radi: 



, afcrrai,. 



I'"iG. 3,5. — Coryphantha sulcolanaUi 



Mammillaria monoclova is only a garden name cited by Schumann (Gesamtb. Kakteen 

 495. 1898) as a synonym of this species. 



Coryphantha impexicoma, credited to Lemaire, is given as a synonym of Mammillaria 

 cornifera impexicoma Salm-Dyck by Riimpler (Forster, Handb. Cact. ed. 2. 414. 1885). 



Illustrations: Bliihende Kakteen 2: pi. 102; Tribune Hort. 4: pi. 139; Succulenta 5: 

 57, as Mammillaria radians; Monatsschr. Kakteenk. 15: 7, as M. radians impexicoma. 



Figure 34 is from a photograph of the plant collected at San Rafael by Dr. Chaffey 

 in 1910. 



21. Corjrphantha sulcolanata Lemaire, Cact^es 35. 1868. 



Mammillaria sulcolanata Lemaire, Cact. Aliq. Nov. 2. 1838. 

 Echinocaclus sulcolanatiis Poselger, Allg. Gartenz. 21: 102. 1853. 

 Mammillaria conimamma Linke, Allg. Gartenz. 25: 239. 1857. 

 Mammillaria cornimamma N. E. Brown, Card. Chron. III. 2: 186. 1887. 

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



Subglobose, somewhat depressed, cespitose, 5 cm. high, 6 cm. thick or more; tubercles some- 

 what 5-angled at base, subconic above, their axils very woolly when young; spines 9 or 10, all radial, 

 unequal, 12 to 16 mm. long, the lower and upper weaker and shorter than the lateral ones, brownish 

 with black tips, but when young whitish yellow with purple tips ; flowers large, 4 cm. long or more, 

 widely spreading, 6 cm. broad or more; perianth-segments oblong, acute. 



