STANDLEY TEEES AND SHRUBS OF MEXICO. 883 



areoles often large, filled with short brown or white wool when young, 

 usually few and remote, on old joints 10 to 12 mm. in diameter ; spines 

 often 10 from an areole on first-year joints, very variable, usually more 

 or less flattened and curved, sometimes terete and straight, yellow, more 

 or less brown-banded or mottled, often brownish in age, sometimes 7 cm. 

 long but usually shorter, sometimes few or none ; glochids numerous, yellow ; 

 wool in areoles short, sometimes brown, sometimes white ; flowers in the typical 

 form lemon-yellow, in some forms red from the first, 7 to 8 cm. long ; fruit 

 pear-shaped to subglobose, narrowed at base, 5 to 7.5 cm. long, purplish, 

 spineless, juicy. 



58. Opuntia tapona Engelm. ; Coulter, Contr. U. S. Nat. Herb. 3: 423. 1896. 

 Baja California ; type collected near Loreto. 



Low spreading plants, rarely over 60 cm. high ; joints glabrous, orbicular to 

 obovate, 20 to 25 cm. in diameter, turgid, pale green; spines 2 to 4, yellow, 

 one much longei*, 5 to 7 cm. long, slender, porrect or sometimes curved down- 

 ward ; glochids brownish ; fruit 4 to 6 cm. long, clavate, dark purple without, 

 red within, spineless. " Tuna tapona." 



59. Opuntia lindheimeri Engelm. Bost. Journ. Nat. Hist. 6: 207. 1850. 

 Opuntia sqtiarrosa Grifiiths, Bull. Torrey Club 43: 91. 1916. 

 Tamaulipas. Texas and Louisiana ; type from New Braunfels, Texas. 

 Usually erect, 2 to 4 meters high, with a more or less definite trunk, but at 



times much lower and spreading; joints green or bluish green, somewhat glau- 

 cous, orbicular to obovate, up to 25 cm. long ; areoles distant, often 6 cm. apart ; 

 spines usually 1 to 6, often only 2, one porrect and 4 cm. long or more, the 

 others somewhat shorter and only slightly spreading, pale yellow to nearly 

 white, sometimes brownish or blackish at base, or some plants spineless ; glo- 

 chids yellow or sometimes brownish ; petals yellow to dark red ; fruit purple, 

 pyriform to oblong, 3.5 to 5.5 cm. long. " Nopal," " nopal azul," " cacanapa " 

 (Texas). 



60. Opuntia cantabrigiensis Lynch, Gard. Chron. III. 33: 98. 1903. 

 Opuntia engelmanii cuija Grifiiths & Hare, N. Mex. Agr. Expt. Sta. Bull. 60: 



44. 1906. 



Opuntia cuija Britt. & Rose, Smiths. Misc. Coll. 50: 529. 1908. 



San Luis PotosI, Queretaro, and Hidalgo. 



Rounded bushy plant, 1 to 2 meters high ; joints orbicular to obovate, 12 to 20 

 cm. long, rather pale bluish green, areoles remote, large, filled with brown 

 wool ; spines usually 3 to 6 but sometimes more, somewhat spreading, acicular, 

 yellow with brown or reddish bases, 1.5 to 4 cm. long; glochids numerous, 1 cm. 

 long or more, yellowish, not forming a brush ; flowers 5 to 6 cm. long, yellowish 

 w ith reddish center ; upper areoles on the ovary bearing long bristles ; fruit 

 globular, about 4 cm. in diameter, purple ; seeds numerous, 4 mm. in diameter. 

 "Cuija" (San Luis PotosI). 



€1. Opuntia pyriformis Rose, Contr. U. S. Nat. Herb. 12: 292. 1909. 



Zacatecas, the type from Hacienda de Cedros. 



Plants 3 to 5 meters high, with widely spreading branches, the lower ones 

 almost resting on the ground and 3 to 5 meters long ; joints obovate, thick, 18 

 cm, long or more ; areoles closely set, small ; spines 1 or 2, on old joints more, 

 usually reflexed, slender, weak, yellow, 10 to 22 mm. long; flowers yellow; 

 fruit 4 cm. long, somewhat tuberculate, spineless, its large areoles crowded 

 with brown hairs forming hemispheric cushions. 



