THE CENTRAL AMERICAN SPECIES OF QUERCUS 17 



51. Leaves persistently densely loose-woolly beneath or partially glab- 

 rescent, bullate-granular, fruit biennial. 

 52. Twigs coarse (3 to 5 mm. thick), persistently velvety-tomentose, 

 leaves waxy-glaucous beneath where denuded. 



34. Q. BRACHYSTACHYS. 



52. Twigs 2 or rarely 3 mm. thick, loosely tomentose or glabrate or rather 



persistently pubescent but not velvety, leaves not waxy-glaucous 



beneath when denuded. 45a. Q. crispipilis var. pannosifolia. 



51. Leaves glabrous or loosely tomentose and soon glabrate or with axillary 



tufts or puberulent on the blade beneath, smooth beneath or if 



bullate-granular then the fruit annual, otherwise fruit either 



annual or biennial. 



53. Leaves bullate-granular beneath, strongly impressed-veiny above. 



33. Q. TRISTIS. 



53. Leaves smooth and not at all bullate beneath, slightly if at all im- 

 pressed, veiny above. 

 54. Twigs densely fulvous-tomentose, persistently so or glabrate. 

 55. Twigs from densely short- velvety-tomentose soon glabrate, 

 leaves coarsely and divergently toothed above the middle, 

 only locally pubescent 40. Q. brenesii. 



55. Twigs loosely and persistently tomentose, leaves coarsely 



toothed or aristate throughout, loosely tomentose all over, 



soon glabrate 41. Q. tenttiaristata. 



54. Twigs sparsely if at all pubescent and soon glabrate. 



56. Leaves very narrow, elongate, and taper-pointed, finely toothed 



or merely aristate, petioles 1 to 3 mm. long. 

 57. Leaves taper-pointed at both ends. 



58. Fruit obviously peduncled, cups often constricted at base. 



40. Q. BRENESII. 



58. Fruit subsessile, cups rounded at base__ 44. Q. gracilior. 

 57. Leaves narrowed toward the base but finally rounded or 

 abruptly cuneate, in no sense taper-pointed basally. 



36. Q. FLAGELLIFERA. 



56. Leaves broad or if narrow not as much as 5 times as long as 

 broad and not taper-pointed, coarsely toothed or if merely 

 aristate then not elongate, petioles much over 5 mm. long 

 or else the blades coarsely toothed. 

 59. Fruit very large (acorns over 3 cm. broad) , cup scales corky- 

 thickened basally at maturity, fruit biennial. 



37. Q. SKINNERI. 

 59. Fruit moderate or small (acorns usually less than 2 cm. 

 broad) , cup scales thin and flat or if basally inflated this 

 resulting from swelling of the buds in their axils and 

 rarely from their own thickening. 

 60. Acorns about 2 cm. broad, nearly round, acorn shells 3 mm. 

 thick or more, very hard, cup scales corky-thickened 

 basally at maturity, fruit biennial. _37. Q. skinneri. 

 60. Acorns less than 2 cm. broad, ovoid or depressed, never 

 spheroid, acorn shells 1.5 mm. thick or less, cup scales 

 basally thickened or thin at maturity. 

 61. Fruit biennial. 



62. Cup scales markedly keeled or thickened basally, cup 

 margins not inrolled, leaves thin, evenly and 

 coarsely toothed with long-aristate tips through- 

 out 38. Q. MONSERRATENSIS. 



62. Cup scales flat at maturity, leaves rather thick, not 



evenly and coarsely toothed throughout nor with 



prominent long aristate. 



63. Leaves not markedly aristate-tipped at the acute 



apex, glabrous or with axillary tufts beneath, 



cup margins not inrolled. 



35. Q. ACATENANGENSIS. 



63. Leaves markedly aristate-tipped at the acute apex, 

 characteristically yellow-glandular-puberulent 

 beneath or rarely glabrate except for axillary 

 tufts, cup margins coarsely inrolled. 



39. Q. CONSPERSA. 



