STANDLEY TREES AND SHRUBS OF MEXICO. 989 



IG, slightly spreading, white except the dark tips; central spines 4, longer 

 and stouter than the radials, porrect. reddish brown; flowers about 12 mm. 

 long, purplish ; inner perianth segments oblong, entire ; fruit scarlet, 12 to 1(5 

 mm. long; seeds brownish. 



35. Neomammillaria evermanniana Britt. & Rose, Cactaceae 4: 97. 1923. 

 Type from Cerralbo Island, Baja California. 



Globose to elongate-turbinate, 5 to 7 cm. in diameter, lactiferous; tubercles 

 closely set, terete, nearly hidden under the numerous slender spines; axils of 

 tubercles at first very woolly and setose; spines white except at tip, there 

 brown; radial spines 12 to 15; central spines 3, erect or nearly so; fruit red, 

 about 1 cm, long; seeds brown. 



36. JSTeomammillaria parkinsonii (Ehrenb.) Britt. & Rose, Cactaceae 4: 98. 

 1923. 



MammiUaria parkinsonii Ehrenb. Linnaea 14: 375. 1840. 



Central Mexico ; type from San Onofi-e in the Mineral del Doctor. 



Cespitose, somewhat depressed to cylindric, 15 cm. high, 7.5 cm. in diameter, 

 globose, glaucous-green ; axils of tubercles lanate and setose ; tubercles milky, 

 short, conic; radial spines numerous, setaceous, short, white; central spines 

 2 or sometimes 4 or 5, brownish at tip ; flowers surrounded by a mass of wool, 

 small, yellowish ; inner perianth segments apiculate ; fruit clavate, scarlet, 1 

 cm. long ; seeds brown. 



37. Neomammillaria geminispina (Haw.) Britt. & Rose, Cactaceae 4: 98. 

 1923. 



MammiUaria geminispina Haw. Phil. Mag. 63: 42. 1824. 



MammiUaria hicolor Lehm. Sam. Cact. Hamb. Gart. 7. 1830. 



MammiUaria nivea Wendl. ; Pfeiff. Enum. Cact. 27. 1837. 



MammiUaria daedala Scheidw. Hort. Belg. 4: 16. 1837. 



MammiUaria toaldoae Lehm. Linnaea 12: 13. 1838 



MammiUaria eburnea Miquel, Linnaea 12: 14. 1838. 



MammiUaria nobUis Pfeiff. Allg. Gartenz. 8: 282. 1840. 



North-central Mexico. 



Cespitose or single in cultivation, cylindric, somewhat glaucous; axils 

 woolly ; tubercles terete, conic ; radial spines 16 to 20, very short, setaceous, 

 white ; central spines 2 to 4, stouter and longer than the radials, about 25 mm. 

 long, black-tipped ; flowers dark red ; inner perianth segments oblong, obtuse, 

 serrate. 



38. Neomam.millaria pyrrhocephala (Sclieidw.) Britt. & Rose, Cactaceae 4: 

 99. 1923. 



j\[ammiUaria pifrrhocephala Scheidw. Allg. Gartenz. 9: 42. 1841. 



MammiUaria scnkei Forst. Handb. Cact. 227. 1846. 



Hidalgo and perhaps Oaxaca ; type from Real del Monte, Hidalgo. 



Cylindric; axils lanate and setose; tubercles angled, green or subglaucous ; 

 .sreole bearing yellowish wool ; spines all black when young, when old becom- 

 ing gray below ; radial spines 6, spreading, the upper ones a little longer ; 

 central spines single, erect ; flowers red. 



39. Neomammillaria collinsii Britt. & Rose, Cactaceae 4: 101. 1923. 

 Type from San Ger6nimo, Oaxaca. 



Plants forming large clumps, the individuals globose. 4 cm. in diameter ; 

 tubercles terete, green but becoming bronzed or even deep purple ; axils of 

 tubercles both lanate and setose ; radial spines usually 7, pale yellowish 

 below, with dark brown or blackish tips, subequal, 5 to 7 mm. long ; central 



