1 



966 CONTRIBUTIONS FROM THE NATIONAL. HERBARIUM. 



Plants nearly globular, usually simple, short-oblong, 20 cm. long, 7.5 to 

 15 cm. in diameter ; tubercles 1 to 2.5 cm. long ; axils of young tubercles 

 grooved and young spine areoles very woolly ; grooves bearing large dark- 

 colored glands ; spines variable, reddish to yellow with brown to black tips ; 

 radials 6 to 16, usually about 2 cm. long, straight; central spines 1 to 4, 

 subulate, stouter than the radials, 3 to 3.5 cm. long, from nearly straight 

 to curved at tip or even strongly hooked ; flowers yellow, 6 cm. long ; scales 

 on flower tube and outer perianth segments more or less lacerate; inner 

 perianth segments oblong, entire, acute; fruit greenish, oblong, 3 to 3.5 cm. 

 long, naked ; seeds 3 mm. long, brown, shining, smooth. 



7. Coryphantha guerkeana (Bodeker) Britt. & Rose, Cactaceae 4: 29. 1923. 

 Mammillaria guerkeana Bodeker, Monatsschr. Kakteenk. 24: 52. 1914. 

 Durango. 



Plant body globular, 6 to 7 cm. in diameter; tubercles bluish green, some- 

 what broader than thick, bearing a large red gland at the base of the 

 groove and sometimes at the top ; radial spines 9 to 12, yellow when young, 

 spreading-bulbose at base, rather stout; central spines 8 or 4, rarely one of 

 them stouter, often bent slightly at tip; flowering areoles very woolly; ovary 

 oblong, naked. 



8. Coryphantha echinoidea (Quehl) Britt. & Rose, Cactaceae 4: 30. 1923. 

 Maminillaria ecJiinoidea Quehl, Monatsschr. Kakteenk. 23: 42. 1913. 

 Durango. 



Plant solitary, globular or a little broader than high, 5 to 6 cm. in di- 

 ameter, very woolly at apex; tubercles conic, 1.5 cm. high, 1.2 cm. broad 

 at base; groove with 1 to 3 small grayish glands; areoles elliptic, woolly 

 when young, glabrate in age; radial spines 20 to 25, 1.5 cm. long, white with 

 darker tips ; central spines 1 to 3, a little stouter than the radials, one of 

 them porrect, horn-colored ; flowers rose-colored, 6 to 8 cm. broad ; perianth 

 segments oblong, broad at apex, denticulate, sometimes mucronate. 



9. Coryphantha clava Lem. Cact. 34. 1868. 

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

 Mammillaria schlechtendalii Ehrenb. Linnaea 14: 377. 1840. 

 Mexico. 



Plant body club-shaped, deep green ; axils of tubercles filled with white wool 

 and witli a red gland at base of the groove; tubercles erect, elongate, some- 

 what 4-sided; spine areoles white-villous ; radial spines usually 7, straight, 

 horn-colored, about equal ; central spine 1, a little longer and stouter than the 

 otliers ; flowers very large, sometimes 9 cm. broad, pale yellow, the outer seg- 

 ments tinged with red ; perianth segments glossy, linear-oblong to spatulate, 

 the outer ones entire, the inner serrate and mucronate at apex. 



10. Coryphantha octacantha (DC.) Britt. & Rose, Cactaceae 4: 30. 1923. 

 Mammillaria octacantha DC. Mem. Mus. Hist. Nat. 17: 113. 1828. 

 Mammillaria leucacantha DC. M6m. Mus. Hist. Nat. 17: 113. 1828. 

 Mammillaria lehmanii Otto; Pfeiflf. Enum. Cact. 23. 1837. 

 Mammillaria macrothele Mart. ; Pfeiff. Enum. Cact. 24. 1837. 

 Mammillaria plaschnickii Otto; Pfeiff. Enum. Cact. 24. 1837. 

 Mammillaria aulacothele Lem. Cact. Aliq. Nov. 8. 1838. 

 Mammillaria higlandtilosa Pfeiff. Allg. Gartenz. 6: 274. 1838. 

 Mammillaria sulcimamma Pfeiff. Allg. Gartenz. 6: 274. 1838. 

 Mammillaria martiana Pfeiff. Linnaea 12: 140. 1838. 



^Mammillaria thelocamptos Lehm. Linnaea 13: Lit. Ber. 101. 1839. 

 Mammillaria polymorpha Scheer; Miihlenpf. Allg. Gartenz. 14: 373. 1846. 

 Central Mexico. 



