STANDLEY — ITlEES AND SHEUBS OF MEXICO. 985 



Solitary or somewhat proliferous at base, cylindric, 12 cm. high ; tubercles 

 green, conic, somewhat angled ; axils of tubercles woolly ; areoles at first 

 white-woolly, becoming glabrate ; spines 4, the upper and lower longer than 

 the lateral ; flower rose-colored, about 25 mm. long ; outer perianth seg- 

 ments olive-colored, the inner linear-lanceolate, white, nerved with red. 



16. Neomammillaria ortegae ISritt. & Rose, Cactaceae 4: 83. 1923. 

 Sinaloa. 



Simple, short-clavate, 5 to S cm. in diameter, light green, lactifei'ous ; 

 tubercles rather short (8 to 10 mm. long), broader at base, obscurely 

 4-angled, somewhat pointed, very woolly but not setose in the axils; spines all 

 radial, 3 or 4, more commonly 4 (sometimes with 1 or 2 small additional 

 spines or bristles, perhaps deciduous), spreading, straw-colored, 6 to 10 mm. 

 long ; flowers small ; fruit clavate, 1 cm. long ; seeds numerous, small, angled, 

 brown. 



17. Neomammillaria meiacantha (Engelm.) Britt. & Rose, Cactaceae 4: 83. 

 1923. 



Mammillaria meiacantha Engelm. Proc. Amer. Acad. 3: 263. 1856. 



Xortliern Mexico. Texas and New Mexico. 



Somewhat depressed, 12 cm. broad or more ; tubercles milky, bluish green, 

 more or less angled, somewhat flattened dorsally, the axils naked ; spines 5 

 to 9, ascending, pale flesh-colored, the tips darker, the lower a little stouter 

 than the upper; central spines porrect, similar to but a little stouter than 

 the radials and often subradial ; spine areoles short-woolly at first; inner 

 perianth segments white with a pink stripe along the inside of the midrib 

 one-fourth its width, greenish brown outside ; fruit scarlet, 22 mm. long ; seeds 

 brownish. 



18. Neomammillaria scrippsiana Britt. & Rose, Cactaceae 4: 84. 1923. 

 Type from Guadalajara, Jalisco. 



Globose or becoming short-eylindric, 6 cm. high ; tubercles milky, in 26 

 rows, bluish green, very woolly in the axils when young; spine areoles very 

 woolly at first ; radial spines 8 to 10, slender, pale with reddish tips ; cen- 

 tral spines generally 2, a little longer than the radials, brown throughout, 

 slightly divergent ; flowers borne near the top of the plant but not in the 

 axils of the youngest tubercles, about 1 cm. long, pinkish, with the margins 

 of the perianth segments paler. 



19. Neomammillaria gig'antea (Hildm. ) Britt. & Rose, Cactaceae 4: 85. 1923. 

 MammiUaria gigantea Hildm. ; Schum. Gesamtb. Kakt. 578. 1898. 

 Guanajuato. 



Solitary or cespitose, depressed-globose, 10 cm. high, 15 to 17 cm. in diam- 

 eter ; axils of tubercles lanate ; radial spines 12, subulate, white, 3 mm. long ; 

 central spines 4 to 6, stout, 2 cm. long, curved, yellowish brown ; flowers yel- 

 lowish green. 



20. Neomammillaria peninsularis Britt. & Rose, Cactaceae 4: 85. 1923. 

 Baja California ; type from Cape San Lucas. 



Plants solitary or in clusters, deeply seated in the ground, more or less flat- 

 topped, bluish green, the stems and tubercles very milky ; tubercles erect, 

 pointed, 4-angled, pale green ; radial spines 4 to 8, nearly erect, short and pale 

 with brown tips, one sometimes nearly central ; axils of tubercles bearing long 

 wool but in age naked ; flowers 1.5 cm. long, arising from old tubercles but near 

 the center ; outer perianth segments narrow, reddish, the inner narrow, acumi- 

 nate, green or light yellow, with erose margins. 



