STANDLEY TREES AND SHRUBS OF MEXICO. 177 



Leaves not aristate from the veius, round-based. Cup turbinate. 



Twigs glabrescent 78. Q. perseaefolia. 



Twigs tomentose 79. Q. pubinervis. 



Leaves sometimes aristate, cordate 73. Q. ai-istata. 



Leaves narrowly oblong 81. Q. totutlensis. 



Leaves characteristically acute. 



C. Leaves narrowly lanceolate (five times as long as broad). 



82. Q. salicifolia. 

 CC. Leaves broadly lanceolate (scarcely four times as long as 

 broad). 

 Leaves rather large (fully 6 cm. wide and 10 cm. long). 



74. Q. uruapanensis. 

 Leaves moderately small. 



Cup turbinately saucer-shaped 83. Q. ghiesbreghtii. 



Cup half-round, deeper. 



Cup rather large (15 mm. broad) 84. Q. tlapuxahuensis. 



Cup smaller (scarcely 12 mm. broad). 



Petiole relatively long (10 mm.) 8-5. Q. lanceolata. 



Petiole short (5 mm.) 90. Q. ocoteaefolia. 



CCC. Leaves ovate-elliptic. 



Leaves somewhat revolute 77. Q. ling'uaefolia. 



Leaves not revolute 92. Q. orizabae. 



CCCC. Leaves lanceolate-oblanceolate 86. Q. lauriua. 



AAA. Leaves leather large, undulate or pungently dentate, rugose, tomentose. 



67. Q. crassifolia. 

 AAAA. Leaves, or many of them, serrate, scarcely coriaceous. 

 D. Leaves very rugose, or else densely tomentulose beneath. 

 E. Leaves tomentulose beneath. 

 Leaves very rugose. 



Leaves large, obovate, toothed above 63. Q. scytophylla. 



Leaves i-ather small (scarcely 4 cm. wide and 6 cm. long), subcordate. 



Leaves obovate 64. Q. omissa. 



Leaves oblong 65. Q. pulchella. 



Leaves only slightly rugose, large. 



Leaves oblong-oblanceolate 111. Q. calophylla. 



Leaves obovate 112. Q. candicans. 



EE. Leaves sparingly fleecy beneath, rather large. Teeth few. 



66. Q. floccosa. 

 EEE. Leaves tomentose beneath. 

 Leaves rather large. 



Leaves obovate-elliptic, the teeth few, toward the end__68. Q. fulva. 

 Leaves ovate-elliptic, the teeth usually numei'ous and coarse. 



69. Q. stipularis. 

 Leaves small (scarcely 3 cm. wide and G cm. long). 



Leaves rather ovate 71. Q. dysophylla. 



Leaves elliptic-oldong 72. Q. splendens. 



DD. Leaves only sl'ghtly rugose, scurfy or fleecy beneath. 



Leaves oblanceolate-ellipric, the teeth toward the end, scurfy. 



Petiole moderate (often 10 mm. long) 94. Q. chrysophylla. 



Petiole short (5 mm.). Leaves often lanceolate and entire. 



95. Q. tridens. 

 Leaves lanceolate or oblong. 



Teeth toward the apex of the blade 98. Q. lanigera. 



Teeth along the side of the blade 99. Q. castanea. 



