996 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



widely spreading; central spines 2 to 4, stout, 10 to 15 mm. long, brown to 

 nearly blackish at tip ; fruit 2.5 cm. long, cUxvate, white or tinged with pink ; 

 seeds small, brown. 



71. Neomammillaria amoena (Hoppfer) Britt. & Rose, Cactaceae 4: 120. 

 1923. 



Mammillaria amoena Hoppfer; Salm-Dyck, Cact. Hort. Dyck. 1849. 99. 1850. 



Morelos and elsewhere in central Mexico. 



Stems robust, columnar ; tubercles green, ovoid, obtuse, subglaucous ; radial 

 spines IG, slender, radiating, white ; central spines 2, rigid, yellowish brown, 8 

 to 10 mm. long, the upper one longer and recurved ; flowers appearing from 

 the axils above the middle of the plant, 2 cm. long, the tube cone-shaped, 

 green ; outer perianth segments somewhat brownish, the inner with a pale 

 brown central stripe, the margins nearly white, obtuse, entire. 



72. Neomammillaria rhodantha (Link & Otto) Britt. & Rose, Cactaceae 4: 

 121. 192.3. 



Mammillaria rhodantha Link & Otto, Icon. PI. Rar. 51. 1829. 



Mammillaria pulchra Haw. in Edwards, Bot. Reg. 16: pi. 1329. 1830. 



Mammillaria fulvispina Haw. Phil. IMag. 7: 108. 1830. 



''.Mammillaria inuncta Hoffniannsegg, Preiss-Verz. ed. 7. 23. 1S33. 



Mammillaria erinacea Wendl. Cact. Hen-enh. 1835. 



Mammillaria chrijsacantha Otto; Pfeiflf. Enum. Cact. 28. 1837. 



Mammillaria fmcata Pfeiff. Enum. Cact. 28. 1837. 



Mammillaria tentaculata Otto; Pfeiff. Enum. Cact. 29. 1837. 



Mammillaria ruficeps Lem. Cact. Hort. Monv. 37. 1839. 



Mammillaria odierana Lem. Cact. Hort. Monv. 46. 1839. 



Mammillaria pj/rrhochracantha Lem. Cact. Hort. Monv. 51. 1839. 



Mammillaria pfeiff eri Booth; Scheidw. Bull. Acad. Brux. 6: 93. 1839. 



1 Mammillaria crassispina Pfeiff. Allg. Gartenz. 8: 406. 1840. 



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



1 Mammillaria imbricata Wegener, Allg. Gartenz. 12: 06. 1844. 



Mammillaria sulphurea Senke; Forst. Handb. Cact. 200. 1846. 



Mammillaria robmta Otto; Forst. Handb. Cact. 207. 1846. 



Mammillaria stueberi Otto; Forst. Handb. Cact. 517. 1846. 



Mammillaria lanifera Salm-Dyck, Cact. Hort. Dyck. 1849. 98. 1850. 



? Mammillaria russea Dietr. Allg. Gartenz. 19: 347. 1851. 



Probably central Mexico. 



C.vlindric, 10 to 30 cm. long, erect, dull green; tubercles terete, some- 

 what narrowed toward the apex, 3 to 5 mm. long, not milky ; axils of tubercles 

 sometimes bearing bristles, often naked; radial spines 15 to 20, white, 5 to 7 

 mm. long; central spines 4 to 6, reddish brown, straight, ascending, much 

 stouter than the radials, 10 to 12 mm. long; flowers numerous, rose-colored, 

 12 mm. broad: inner perianth segments linear, somewhat spreading, pointed; 

 fruit 2.5 cm. long, cylindric, lilac to red ; seeds brownish. 



73. Neomammillaria plumosa (Weber) Britt. & Rose, Cactaceae 4: 123. 1923. 



Mammillaria plumosa Weber, Diet. Hort. Bois 804. 1898. 



Northern Mexico. 



Small, growing in dense clusters, sometimes 15 cm. broad, entirely cov- 

 ered by the mass of white spines; tubercles somewhat woolly in their axils, 

 2 to 3 mm. long; spines about 40, all radial, weak, plumose, 3 to 7 mm. 

 long; flowers white, 3 to 4 mm. long; perianth segments with a red line 

 running down the center; seeds black. 



