BRITTON AND ROSE] OPUNTIOID£AE OF NORTH AMERICA 529 



OPUNTIA LITTORALIS (Engelm.) Britton & Rose 



Opuntia engehnanni littoralis Engelm. in Brewer & Wats. Bot. Cal. 1: 



248. 1876. 

 Opuntia lindheimeri littoralis Coult. Contr. Nat. Herb. 3:422. 1896. 



Type locality : Coast of California, Santa Barbara to San Diego. 

 Distribution : Coast of southern California. 



OPUNTIA CUIJA (Griffiths & Hare) Rose 



Opuntia engelmannii cuija Griffiths & Hare, Bull. N. Mex. Coll. Agr. 

 60: 44. 1907. 



Type locality: San Luis Potosi, Mexico. 



Distribution: San Luis Potosi to Queretaro and Hidalgo. 



Illustrations: Bull. N. Alex. Coll. Agr. 60: pi. 2. figs. I, 2. 



OPUNTIA OCCIDENTALS Engelm. & Bigel. 



Opuntia occidentalis Engelm. & Bigel. Proc. Am. Acad. 3:291. 1856. 

 Opuntia lindheimeri occidentalis Coult. Contr. Nat. Herb. 3-421. 1896. 



Type locality: Western slopes of the Californian Mountains, be- 

 tween San Diego and Los Angeles. 



Distribution : Southwestern California. 



Illustrations: Pac. R. Rep. 4: pi. 7. figs. I, 2; Bull. N. Mex. Coll. 

 Agr. 60: pi. 3. fig. 2. 



OPUNTIA MEGALARTHRA Rose, sp. nov. 



Plants 1 to 4 meters high, often much branched and the arms 

 widely spreading; joints generally orbicular, very large, often 30 cm. 

 or rarely 50 cm. in diameter, glaucous, bluish green, very thick and 

 turgid; areoles distant, 4 to 6 cm. apart, brownish when young, 

 black in age; spines yellow, 2 to 6 at each areole on young joints, on 

 old joints as many as 8, very stout, 4 cm. long or more, more or 

 less flattened or angled ; glochides yellow, numerous ; flowers lemon- 

 yellow, 7 to 8 cm. broad; fruit globular, oblong, sometimes 7 cm. 

 long, purplish. 



Type in U. S. National Herbarium, no. 453.757, collected at 

 Hacienda Palmar, near Pachuca, Hidalgo, Mexico, by Rose & 

 Painter, July 21, 1905 (no. 10,255). 



Distribution : A common and widely distributed species in the 

 States of Hidalgo, Queretaro, Zacatecas, and San Luis Potosi. 



Series PROCUMBENTES 

 Depressed or prostrate plants with yellow spines. 



