962 CONTRIBUTIONS FEOM THE NATIONAL HERBARIUM. 



1. Mamillopsis senilis (Lodd.) Weber; Britt. & Rose, Cactaceae 4: 19. 1923. 

 Mammillaria senilis Lodd. ; Salm-Dyck, Cact. Hort. Dyck. 1849. 82. 1850. 

 High mountains of Chiliuahua and Durango. 



Stems 6 to 15 cm. higli, 3 to 6 cm. in diameter, tlie flesh juicy and drying red ; 

 tubercles 3 to 4 mm. long; spines 30 to 40, 2 cm. long; flowers 6 cm. broad; 

 perianth segments oblong, acute, with serrate margin. " Cabeza de vieja " 

 {Ochoterena) . 



2. Mamillopsis diguetii (Weber) Britt. & Rose, Cactaceae 4: 20. 1923. 

 MammiUaria senilis diguetii Weber, Bull. Mus. Hist. Nat. 10: 383. 1904. 

 Jalisco and Sinaloa ; type from Sierra de Nayarit, Jalisco. 



Plants densely cespitose, forming a hemispheric clump of some 35 globular 

 heads, each 25 cm. in diameter; radial spines numerous, dark straw-colored; 

 flowers about 2 cm. broad ; ovary bearing small scales. 



43. COCHEMIEA Walton, Cact. Journ. 2: 50. 1899. 



Plant body cylindric, often much elongate, the surface covered with spirally 

 arranged tubercles, these not milky; tubercles not grooved above; spines both 

 central and radial; flowers borne from the axils of upper old tubercles, nar- 

 rowly tubular, curved and bilabiate; perianth segments in 2 series; stamens 

 and style red, exserted ; ovary naked ; fruit indehiscent, globular, red, naked, 

 bearing a large scar at the top ; seeds black, reticulate. 



The species here listed are the only ones known. 



Spines all straight 1. C. halei. 



Spines with some or all of the centrals hooked. 



Central" spine normally solitary 2. C. poselgeri. 



Central spines normally 2 to 11 (sometimes only one in No. 3). 



Central spines 1 to 4 3. C. setispina. 



Central spines 8 to 11 4. C. pondii. 



1. Cochemiea halei (T. S. Brandeg.) Walton, Cact. Journ. 2: 50. 1899. 



Mammillaria halei T. S. Brandeg. Proc. Calif. Acad. II. 2: 161. 1889. 



Islands of southern Baja California ; type from Magdalena Island. 



Cespitose ; stems nearly upright, often 30 to 50 cm. high, 5 to 7.5 cm. in di- 

 ameter, almost entirely covered by the spines ; tubercles short, their axils 

 woolly but not setose ; radial spines 10 to 20, 10 to 12 mm. long ; central spines 

 3 or 4, 25 mm. long, all straight ; flowers central or nearly so, 4 to 5 cm. long ; 

 fruit scarlet, 12 mm. long; seeds reticulate. 



2. Cochemiea poselgeri (Hildmann) Britt. & Rose, Cactaceae 4: 22. 1923. 

 Mammillaria poselgeri Hildmann, Gartenflora 34: 559. 1885. 

 MammiUaria roseana T. S. Brandeg. Zoe 2: 19. 1891. 



Mammillaria radliana Quehl, Monatsschr. Kakteenk. 2: 104. 1892. 



Lower elevations in southern Baja California ; type from the Cape Region. 



Stems numerous from a central root, spreading or sometimes pendent from 

 rocks or creeping over the ground, often 2 meters long, 4 cm. thick ; areoles 

 and upper axils white-woolly, the latter rarely SQtose; tubercles remote, some- 

 what flattened; radial spines 7 to 9, 9 to 12 mm. long, straw-colored; central 

 spine 1, hooked, 25 mm. long ; flowers appearing in the upper axils, 3 cm. long, 

 scarlet ; fruit globular, 6 to 8 mm. in diameter. 



3. Cochemiea setispina (Coulter) Walton, Cact. Journ. 2: 51. 1899. 

 Cactus setispinus Coulter, Contr. U. S. Nat. Herb. 3: 106. 1894. 

 Mammillaria setispina Engelm. ; K. Brandeg. Erythea 5: 117. 1897. 

 Interior of southern Baja California, the type from San Borgia. 



