982 CONTRIBUTIONS FEOM THE NATIONAL HERBARIUM. 



dark bi'owu, erect ; flowers 1 cm. long ; outer perianth segments dark purple 

 with lighter margins, entire, the inner cream-colored to almost pale yellow ; fruit 

 clavate, red, 15 cm. long; seeds brown. 



4. Neomammillaria brandegeei (Coulter) Brftt. & Rose, Cactaceae 4: 73. 1923. 

 ('act IIS hrandcfjeci Coulter, Contr. U. S. Nat. Herb. 3: 9G. 1894. 



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



MammiUaha f/ahhii Engelni. ; K. Brandeg. Erythea 5: 116. 1897. 



Mammillaria brandegeei K. Brandeg. Erythea 5: 116. 1897. 



Baja California ; type from San Jorge. 



Cylindric to globular, flattened, solitary or in clusters of 2 to S ; tubercles 

 angled; axils woolly; radial spines 9 to 16, 8 to 10 mm. long, yellowish 

 brown; central spines 3 to 6, a little longer and darker than the radials; 

 flowers 15 mm. long; outer perianth segments ovate, striate, ciliate, the 

 inner greenish yellow, narrower, entire; fruit white (according to Schumann), 

 bearing a few narrow scales. 



5. Neomamjnillaria gummifera (Engelm.) Britt. & Rose, Cactaceae 4: 74. 



1923. 



Mammillaria gummifera Engelm. in Wisliz. Mem. North. Mex. 105. 1848. 



Chihuahua ; type from Cosihuiriachi. 



Depressed-globose, 8 to 12 cm. in diameter ; tubercles light green, milky, 

 somewhat 4-angled; axils of tubercles and spine areoles somewhat white- 

 tonientose when young ; radial spines 10 to 12, ascending, white with brown- 

 ish or even blackish tips, the lower ones stouter and longer than the others, 

 often 2 to 2.5 cm. long and somewhat recurved ; central spines 1 or 2, some- 

 times 4 ; flowers 3 cm. long, brownish red outside ; inner perianth seg- 

 ments reddish white with dark red band in middle. 



6. Neomammillaria heyderi (Miihlenpf. ) Britt. & Rose, Cactaceae 4: 75. 1923. 

 Mammillaria heyderi Miihlenpf. AUg. Gartenz. 16: 20. 1848. 



Northern Mexico. Texas. 



Plant globose or somewhat flattened at apex ; tubercles conic, 12 mm. long, 

 when young bearing wool in their axils ; young spine areoles white-woolly ; 

 radial spines 20 to 22, white, setaceous, the lower ones stouter and longer ; 

 central spine solitary, brown at base and apex, 5 to 6 mm. long; flowers pink- 

 ish, the segments linear-oblong ; fruit oblong, red. '" Biznaga de chilillos " 

 (Patoni). 



7. Neomammillaria hemisphaerica (Engelm.) Britt. & Rose, Cactaceae 4: 



75. 1923. 



MammiUaria hemisphaerica Engelm. in Wisliz. Mem. North. Mex. 105. 1848. 



Northeastern Mexico ; type from Matamoros, Tamaulipas. Western Texas. 



Deep-seated in the soil, hemispheric, 8 to 12 cm. broad, dark green ; tubercles 

 only slightly angled, not very closely set, 1 to 1.5 cm. long, somewhat pointed, 

 their axils nearly naked in the dormant stages; spine areoles woolly when 

 young, becoming glabrate in age ; radial spines 9 to 12, widely spreading, 

 acicular, the upper ones more delicate, 4 to 8 mm. long, brownish or smoky, 

 often with black tips ; central spine solitary, porrect, brown ; flowers cream- 

 colored, 1 to 1.5 cm. long ; inner perianth segments acute ; fruit slender, clavate, 

 red, 1 to 1.5 cm. long. 



8. Neomammillaria phymatothele (Berg) Britt. & Rose, Cactaceae 4: 76. 



1923. 

 MammiUaria phymatothele Berg, Allg. Gartenz. 8: 129. 1840. 

 Mammillaria ludivigii Ehrenb. Linnaea 14: 376. 1840. 

 Central Mexico. 



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