16 MISC. PUBLICATION 47 7, U. S. DEPT. OF AGRICULTURE 



30. Blades smooth beneath, that is not bullate. 



36. Leaves linear-lanceolate or flagellate, at least 5 times as long as 

 broad and very long-tapering at the apex, veins 18 to 24 on 

 each side and issuing at an angle of 80 to 85 degrees from the 



midrib 36. Q. flagellifera. 



36. Leaves not linear-lanceolate or flagellate, less than 5 times as long 

 as broad and if very long-tapering at the apex, then broadened 

 below the middle, veins seldom over 15 on each side and seldom 

 issuing from the midrib at an angle as great as 80 degrees. 

 37. Fruit biennial. 



38. Leaves acuminate or narrowly lanceolate. 



39. Petioles 5 or rarely 10 mm. long, acorns 25 to 30 mm. long 



and 22 to 26 mm. broad 32. Q. crispifolia. 



39. Petioles 10 or usually 15 to 25 mm. long, if shorter then the 

 leaves toothed, acorns up to 17 mm. long and 14 mm. 

 broad. 

 40. Leaves glabrous beneath except for axillary tufts, about 



1.5 to 2 cm. broad 35. Q. acatenangensis. 



40. Leaves resinous-puberulent beneath, 3 to 5 (rarely less) cm. 



broad 39. Q. conspersa. 



38. Leaves oblong or ovate, neither acuminate nor lanceolate, 

 abruptly aristate at apex, crisped- or woolly-pubescent 

 beneath. 

 41. Leaves rather sparsely short- tomentose beneath, smooth or 



at most low-bullate 45. Q. crispipilis. 



41. Leaves rather densely thick-tomentose beneath or eventually 

 glabrate but never sparsely or short-tomentose, granu- 



lar-bullate 45a. Q . crispipilis var. pannosifolia. 



37. Fruit annual. 



42. Cup scales very loosely appressed. 



43. Leaves long-acuminate or tapering at apex (species of Colom- 

 bia) 20. Q. HTTMBOLDTII. 



43. Leaves merely acute (species of Guatemala). 



21. Q. BENTHAMI. 



42. Cup scales rather closely appressed. 



44. Twigs short- velvety-tomentose or tardily glabrate. 



24. Q. HONDURENSIS. 



44. Twigs variously glabrous or from loosely tomentose becoming 

 glabrate, but not velvety. 

 45. Leaves long-acuminate. 

 46. Petioles over 5 mm. long. 



47. Acorns 25 to 30 mm. long and 22 to 26 mm. broad 

 (species of Guatemala and Mexico). 



32. Q. CRISPIFOLIA. 



47. Acorns not over 15 mm. long and 12 mm. broad, 

 peduncles not over 10 mm. long (species of Costa 



Rica and Panama) 30. Q. seemanni. 



46. Petioles 2 to 4 mm. long, peduncles 10 to 25 mm. long, 

 leaves very long-taper-pointed. 



31. Q. GTTLIELMI-TRELEASEI. 



45. Leaves short-acuminate or merely acute. 



48. Leaf margins flat, neither markedly crisped nor strongly 



revolute 28. Q. borucasana. 



48. Leaves crisped and coarsely revolute. 



49. Veins issuing at an angle of 75 or 80 degrees from the 

 midrib, acorns not over 11 mm. long and 10 mm. 



broad 27. Q. eugeniaefolia. 



49. Veins issuing at an angle of 45 or 50 degrees from the 

 midrib, acorns about 18 mm. long and broad. 



29. Q. TONDTTZII. 



25. Leaves toothed or the margins aristate. 



50. Leaves very large, thin, characteristically obovate, coarsely toothed or 

 merely long-aristate above the middle, the lower surface persistently 

 and densely short-tomentose but the veins glabrous. 



46. Q. CANDICANS. 

 50. Leaves medium-sized or if large not short-tomentose on the lower surface, 

 variously woolly to glabrous. 



