988 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



times with 1 to 3 very short accessory ones from the lower part of the areole ; 

 lower spine much longer, spreading or recurved, 5 to 6 cm. long, somewhat 

 angled ; all spines pale, more or less tinged with brown, with dark tips ; flower 

 pinkish, 10 to 12 mm. long; outer perianth segments acute, somewhat ciliate, 

 the inner narrow, acuminate, with spreading tips ; fruit clavate, red ; seeds 

 brown. 



SI. Neomammillaria mystax (Mart.) Britt. & Rose, Cactaceae 4: 92. 1923. 



Mammillaria viystax Mart. Nov. Act. Nat. Cur. 16: 332. 1832. 



MammiUaria leucotriclia Scheidw. Allg. Gartenz. 8: 338. 1840. 



Mammillaria zaniliotricha Scheidw. Allg. Gartenz. 8: 338. 1840. 



Mammillaria mutabilis Scheidw. Allg. Gartenz. 9: 43. 1841. 



MammiUaria funkii Scheidw. Allg. Gartenz. 9: 43. 1841. 



Mammillaria autumnalis Dietr. Allg. Gartenz. 16: 297. 1848. 



Mammillaria maschalacantJia INIonville ; Labour. Monogr. Cact. 106. IS.'io. 



Mountains of Puebla and Oaxaca, and perhaps elsewhere in southern Mexico. 



Globose to short-cylindric, 7 to 15 cm. high, flat-topped ; tubercles in as many 

 as 34 rows, thickly set, milky ; radial spines 8 to 10, small, white ; central spines 

 4. 3 about twice as long as the radial ones, the other much elongate, G to 7 cm. 

 long ; flowers 1.5 to 2 cm. long, appearing in 2 or 3 rows, very abundant ; inner 

 perianth segments dark red, 12 mm. long; fruit red, 2 to 2.5 cm. long. 



32. Neomammillaria petterssonii (Hildm.) Britt. & Rose, Cactaceae 4: 94. 

 1923. 



MammiUaria pcttcr,ssonii Hildm. Deutsch. Gartenz. 1886: 185. 188G. 



Mammillaria heeseana ]McDowell, Monatsschr. Kakteenk. 6: 125. 1896. 



Guanajuato. 



Plants rather large for the genus, cylindric, 20 cm. high or more, very 

 spiny; tubercles arranged in 13 or 21 spirals, terete, setose in their axils; 

 radial spines 10 to 12, white, with black tips ; central spines 4. the longest 

 ones 4.5 cm. long; fruit small, naked, oblong. 



33. Neomam^m^jllaria karwinskiana (Mart.) Britt. <& Rose, Cactaceae 4: 

 95. 1923. 



Mammillaria karwini^Jciana Mart. Nov. Act. Nat. Cur. 16: 335. 1832. 



"} Mammillaria fischeri Pfeiff. Allg. Gartenz. 4: 257. 1836. 



Mammillaria centrispina Pfeiff. Allg. Gartenz. 4: 258. 1836. 



1 Mammillaria virens Scheidw. Allg. Gartenz. 9: 43. 1841. 



Oaxaca. 



Globose to cylindric, somewhat flattened above ; tubercles terete, milky ; 

 spnes 4 to 6. all radial, sometimes one more near the center than the others, 

 nearly equal, short, brown or blackish at the tips or throughout ; axils very 

 woolly and with long, conspicuous, white or bi'own-tipped bristles much 

 longer than the tubercles; flowers nearly 2 cm. long, the scales and outer 

 perianth segments narrow, reddish except at the margins, ciliate ; inner 

 perianth segments broader, cream-colored, not ciliate, mucronate-tipped ; fruit 

 15 mm. long, red; seeds brown. 



Related to this species is Mammillaria knippeliana Quehl (Monatsschr. 

 Kakteenk. 17: 59. 1907). It was described from cultivated plants. 



34. Neomammillaria standleyi Britt. & Rose, Cactaceae 4: 07. 1923. 

 Sonora ; type from Sierra de Alamos. 



Plants usually solitary, nearly globose, often 10 cm. in diameter, pale green, 

 densely covered with spines ; axils of tubercles containing white bristles, the 

 flowering and fruiting ones filled with dense white wool ; radial spines about 



