990 CONTEIBUTIONS FEOM THE NATIONAL HERBARIUM. 



spine 1, similar to or a little longer and usually darker than the radials ; 

 flowers 12 to 15 mm. long ; outer perianth segments reddish with yellowish 

 margin, ciliate ; inner perianth segments lighter, entire, acuminate ; fruit 

 clavate, 15 cm. long, deep red ; seeds brownish. 



40. Neomammillaria chinocephala (Purpus) Britt. & Rose, Cactaceae 4: 

 101. 1923. 



Mammillaria chinocephala Purpus, Monatsschr. Kakteenk. 16: 41. 1906. 



Highlands of central Mexico ; type from Sierra de Parras, Coahuila. 



Plants globose, sometimes 8 cm. in diameter, almost hidden by the white 

 spines ; tubercles low, very milky ; axils of tubercles densely filled with white 

 wool and numerous hairlike bristles ; radial spines 35 to 40, somewhat pecti- 

 nate, spreading ; central spines 2 to 7, more or less divergent, much stouter than 

 the radials, rigid, white, with brownish tips ; flowers 1 cm. long, rose-red ; fruit 

 clavate, red ; seeds small, brown. 



41. Neomammillaria tenampensis Britt. & Rose, Cactaceae 4: 101. 1923. 

 Type from Barranca de Tenampa. 



Globose, light green, 5 to 6 cm. in diameter ; tubercles 6 to 7 mm. long, 

 4-sided, pointed ; axils of upper tubercles naked, but those producing flowers 

 filled with yellow wool and numerous yellow bristles ; spines 4 to 6, brown- 

 ish with dark tips, ascending, surrounded at base by 8 to 10 small white 

 bristles; outermost perianth segments small, brownish, the outer ones 

 lanceolate, acuminate, similar to the inner ones, all ciliate; inner perianth 

 segments reddish purple, 8 to 10 mm. long, lanceolate, apiculate, denticulate. 



42. Neomammillaria polygona (Salm-Dyck) Britt. & Rose, Cactaceae 4: 101. 

 1923. 



Mammillaria polyyona Salm-Dyck, Cact. Hort. Dyck. 1849. 120. 1850. 



Mexico, the range not known. 



Subclavate, 10 cm. high, simple; axils of tubercles lanate and setose; 

 tubercles 4-angled ; radial spines about 8, 2 or 3 upper ones minute, the 4 

 lateral ones and the lowermost one longer; central spines 2, stout, brownish 

 at tip, often long and recurved ; fiowers pale rose-colored. 



Related to this species is Mammillaria echinops Scheidw. (Hort. Belg. 5: 

 95. 1838), which was described from Mexico. 



43. Neomammillaria confusa Britt. & Rose, Cactaceae 4: 102. 1923. 

 Mexico, but range not known. 



At first solitary, becoming cespitose, globose to short-cylindric, deep green; 

 axils densely white-woolly and setose ; tubercles short, a little flattened, 4- 

 angled, pointed ; spines 4 to 6, all radial, ascending, at first yellowish with 

 brown tips, in age white below, 2 to 3 mm. long; flowers yellow, about 8 

 mm. long ; outer perianth segments ovate, ciliate, with a black mucro-tip ; 

 inner perianth segments spreading, acute. 



44. Neomammillaria villifera (Otto) Britt. & Rose, Cactaceae 4: 102. 1923. 

 Mammillaria villifera Otto ; Pfeiff. Enum. Cact. 18. 1837. 



Mexico, but range not known. 



Subglobose, proliferous; axils lanate and setose; tubercles angled; areoles 

 at first lanate, in age naked ; spines 4, rigid, straight, the lowest one longer 

 (8 mm. long), at first purplish, in age black; flowers pale rose-colored; in- 

 ner perianth segments 14, acute. 



45. Neomammillaria polyedra (Mart.) Britt. & Rose, Cactaceae 4: 102. 1923. 

 Mammillaria polyedra Mart. Nov. Act. Nat. Cur. 16: 326. 1832. 

 Mammillaria polytricha Salm-Dyck, Allg. Gartenz. 10: 289. 1842. 

 Southern Mexico; type from Oaxaca. 



