BRITTON AND ROSE] OPUNTIOIDEAE OF NORTH AMERICA 527 



Series TUNAE 



Bushy plants with abundant yellow spines. The color of the 

 spines is not a wholly satisfactory character. 



OPUNTIA CHLOROTICA Engelm. & Bigel. 

 Opuntia chlorotica Engelm. & BiGEL. Proc. Am. Acad. 3:291. 1856. 



Type locality : On both sides of the Colorado from San Francisco 

 Mountains to headwaters of Bill Williams River. 



Distribution : Arizona, Sonora, New Mexico, Nevada, and Cali- 

 fornia. 



Illustration : Pac. R. Rep. 4 : pi. 6, figs. 1-3. 



OPUNTIA CHLOROTICA SANTA-RITA Griffiths & Hare 



Opuntia chlorotica santa-rita Griffiths & Hare, Bull. N. Mex. Coll. Agr. 

 60: 64. 1906. 



Type locality : Celero Mountains, Arizona. 

 Distribution : Arizona. 



OPUNTIA TAPONA Engelm. 

 Opuntia tapona Engelm.; Coult. Contr. Nat. Herb. 3: 423. 1896. 



Type locality : Near Loreto, Lower California. 

 Distribution: Known only from the type locality. 

 Doubtfully included in series Tunae. 



OPUNTIA PALMERI Engelm. 

 Opuntia palmeri Engelm.; Coult. Contr. Nat. Herb. 3:423. 1896. 



Type locality: Near St. George, Utah. 

 Distribution: Utah. 



OPUNTIA BECKERIANA Schum. 



Opuntia bcckeriana Schum. Gesamtb. Kakteen 722. 1899. 



Type locality: Probably Mexico. 



Distribution : Mexico. 



Known to us only from the description. 



OPUNTIA LUCAYANA Britton 

 Opuntia lucayana Britton, Bull. N. Y. Bot. Gard. 4: 141. 1906. 



Type locality : Grand Turk Island, Bahamas. 

 Distribution : Grand Turk. 



