944 CONTEIBUTIOXS FROM THE NATIONAL HERBARIUM. 



7. Ferocactus h.orridus Britt. & Rose, Cactaceae 3: 128. 1922. 

 Type from San Francisquito Bay, Baja California. 



Globular, 30 cm. in diameter or more ; ribs 13, broad, 2 cm. high, obtuse, not 

 tubercled; areoles 1.5 to 2.5 cm. apart, large; radial spines 8 to 12, acicular, 

 spreading, white, 8 to 4 cm. long; central spines 6 to 8, very diverse, all 

 reddish, either spreading or porrect, all straight except 1, this much elongate, 

 often 12 cm. long, much flattened, very strongly hooked. 



8. Ferocactus lecontei (Engelm.) Britt. & Rose, Cactaceae 3: 129. 1922. 

 Echinocactus lecontei Engelm. Proc. Amer. Acad. 3: 274. 1856. 

 Sonora and Baja California. Utah, Arizona, and southern California. 

 Becoming cylindric, 2 meters high or more, rather slender ; ribs 20 to 30, 



somewhat undulate ; areoles longer than broad ; some of the radial spines 

 threadlike or bristly, the other radials and the central spines flattened and 

 flexible, usually appressed against the plant, most of them ascending, rarely 

 if ever hooked, white to red ; flowers originally described as yellow, also re- 

 ported as red, 5 to 6 cm. long; fruit oblong, yellow; seeds minute, less than 

 2 mm. long, black, shiny, reticulate, slightly compressed. 



9. Ferocactus acanthodes (Lem.) Britt. & Rose, Cactaceae 3: 129. 1922. 

 Echinocactus acanthodes Lem. Cact. Hort. Monv. 106. 1839. 

 Echinocactus cylindraceus Engelm. Proc. Amer. Acad. 3: 275. 1856. 

 Northern Baja California. Nevada and southern California. 



At first globular but in age cylindric, sometimes nearly 3 meters high, very 

 spiny ; ribs often as many as 27, acute, 1 to 2 cm. high ; areoles 1 cm. in 

 diameter or more, densely brown-felted when young, closely set, often nearly 

 contiguous ; spines often white or pinkish or sometimes bright red ; radial 

 spines weak, setiform or acicular, usually pungent, often spreading ; central 

 spines subulate, slender, spreading, more or less flattened, annulate, tortuous 

 and more or less curved, but never hooked at tip, the longest 10 to 12 cm. 

 long; flowers yellow to orange, 4 to 6 cm. long, usually broader than long; 

 scales on ovary and flower tube imbricate, ovate, with a large purple blotch 

 on their back, gradually passing upward into the perianth segments; inner 

 perianth segments glossy, narrowly oblong to spatulate, obtusish, often toothed ; 

 fruit oblong, 3 cm. long, crowned by the scaly perianth, dry, dehiscing by a 

 basal pore ; seeds black, 3.5 mm. long, pitted. 



10. Ferocactus santa-maria Britt. & Rose, Cactaceae 3: 131. 1922. 

 Type from Santa Maria Bay, Baja California. 



Cylindric, 60 cm. high or more ; ribs about 14 ; outer spines several, thread- 

 like; central spines in 2 series, all straight, grayish, annulate, subulate, the 

 central one stouter, flatter, ascending, somewhat curved at tip ; old flowers 

 persisting, 6 to 7 cm. long ; fruit 3 to 4 cm. long, bearing orbicular scales ; 

 seeds 2 mm. long, finely reticulate. 



11. Ferocactus dig'uetii (Weber) Britt. & Rose, Cactaceae 3: 13L 1922. 

 Echinocactus diguetii Weber, Bull. Mus. Hist. Nat. 4: 100. 1898. 

 Islands of the Gulf of California ; type from Santa Catalina Island. 

 Plants very stout, usually 1 to 2 meters but sometimes 4 meters, high, 60 to 



SO cm. in diameter or more ; ribs sometimes as many as 39, rather thin ; areoles 

 1 to 1.5 cm. long, somewhat elliptic, approximate or on old plants coalescent ; 

 spines 6 to 8, yellow, subulate, 3 to 4 cm. long, slightly curved and a little spread- 

 ing ; flowers numerous, 3 to 3.5 cm. long ; scales on ovary and flower tube 

 ovate, closely imbricate, thin on the margin and somewhat lacerate ; inner 

 perianth segments red with j'ellow margins, oblong, 2 cm. long; tube of flower 

 below stamens very short ; fruit scaly. " Biznaga." 



