994 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



62. Neomammillaria aureiceps (Lem.) Britt. & Rose, Cactaceae 4: 114. 1923. 

 MammiUaria aureiceps Lem. Cact. Aliq. Nov. 8. 1838. 



Valley of Mexico. 



Globose to short-oblong, S to 10 cm. in diameter ; tubercles short, terete, 

 woolly and setose in their axils ; radial spines about 20, bristle-like, white, 5 to 8 

 mm. long, spreading; central spines sevefal, sometimes as many as 9, yellow, 

 stouter and longer than the radials, 10 to 14 mm. long, somewhat spreading and 

 a little curved inward ; flowers small, dark red. 



63. Neomammillaria yucatanensis Britt. & Rose, Cactaceae 4: 114. 1923. 

 Yucatan ; type from Progreso. 



Plants in clumps of 4, erect, cylindric, not milky, 10 to 15 cm. long, 3 to 6 cm. 

 in diameter, very spiny ; tubercles conic, woolly in their axils but not setose ; 

 radial spines about 20, white, spi*eading, acicular ; central spines 4 or rarely 5, 

 much stouter than the radials, G to 8 mm. long, sightly spreading above, yel- 

 lowish brown ; flowers very small, rose ; fruit oblong, bright red. 



64. Neomammillaria pring-lei (Coulter) Britt. & Rose, Cactaceae 4: 115. 1923. 

 Cactus phnglei Coulter, Contr. U. S. Nat. Herb. 3: 109. 1894. 

 MarnmUlaria pringlei K. Brandeg. Zoe 5: 7. 1900. 



State of Mexico ; type from Tultenango Canyon. 



Solitary, with long fibrous roots, usually globose but sometimes depressed 

 or short-cylindric, 6 to 16 cm. high, 6 to 7 cm. in diameter ; tubercles dull 

 green, terete, conic, 6 to 10 mm. long; axils of tubercles woolly and setose; 

 spines all yellow; radial spines 18 to 20, setaceous, spreading, 5 to 8 mm. 

 long; central spines 5 to 7, much stouter and longer than the radials, more 

 or less recurved, 2 to 2.5 cm. long, those from the upper areoles curved over 

 the apex of the plant ; flowers deep red, 8 to 10 mm. long ; fruits borne in a 

 circle near the middle of the plant, oblong, 12 to 15 mm. long; seeds small, 

 brown. 



65. Neomammillaria cerralboa Britt. & Rose, Cactaceae 4: 116. 1923. 

 Type from Cerralbo Island, Baja California. 



Cylindric, solitary, 10 to 15 cm. high, 5 to 6 cm. in diameter; tubercles not 

 milky, yellowish, terete, obtuse, closely set ; spines all yellow, very mucli alike, 

 about 11, one usually more central, the longer ones nearly 2 cm. long; flowers 

 1 cm. long or less. 



66. Neomammillaria phaeacantha (Lem.) Britt. & Rose, Cactaceae 4: 116. 

 1923. 



MammiUaria phaeacantha Lem. Cact. Hort. Monv. 47. 1839. 



MammiUaria nigricans Fennel, Allg. Gartenz. 15: 66. 1847. 



Mexico, the range not known. 



Globose or somewhat depressed, green ; axils of tubercles woolly ; tubercles 

 conic, hardly if at all angled; spine areoles small, yellowish-tomentose (prob- 

 ably so only when young) ; radial spines 16 to 20, white, setaceous; central 

 spines 4, black, subulate, spreading or reflexed, the lowest one longest ; flowers 

 from the upper part of the plant, dark red; perianth segments oblong, acumi- 

 nate. 



67. Neomammillaria graessneriana (Bodeker) Britt. & Rose. Cactaceae 4: 

 117. 1923. 



MammiUaria graessneriana Bodeker, Monatsschr. Kakteenk. 30: 84. 1920. 



Mexico, the range not known. 



Solitary or becoming cespitose, globose, 6 to 8 cm. in diameter, dark bluish 

 green, somewhat depressed at apex ; tubercles 4-angled, 8 mm. long, not milky, 

 obtuse or truncate at apex, not setose in the axils; spine areoles circular, 



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