176 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



II. Fruit maturing the second season; shell of acorn woolly within, the 



abortive ovules lateral ; stigmas short and rounded, nearly sessile ; leaves 

 entire to pungently but not aristately toothed. Pbotobalanus. 



Leaves for a time tonientose, rather large ; a tree 56. Q. tomentella. 



Leaves glabrate, rather small; a shrub 57. Q. palmeri. 



III. Fruit (not known in nos. 66. 70, 72, 75, S'3. 92, 94, 95, 102, 103, 109, 112) 

 often maturing the second season ; shell of acorn woolly within, the abortive 

 ovules characteristically apical ; stigmas spatulate, on elongate styles ; 

 leaves entire or toothed or often incised, tlie tip and teeth often aristate. 

 Erythrobalanus. 



A. Leaves small, coriaceous, not rugose, usually rather pungently few-toothed. 

 Leaves elliptic-ovate, more or less scurfy. 



Toothing of leaves repand 58. Q. emoryi. 



Toothing of leaves serrate / 60. Q. eduardi. 



Leaves lanceolate. 



Leaves* tomentulose beneath 59. Q. durifolia. 



Leaves glabrous, or in the first subtomentose. 



Leaves veiny, rather elongate 61. Q. devia. 



Leaves not veiny 91. Q. depressa. 



Leaves broadly oblong or obovate-oblong 93. Q. sideroxyla. 



A A. Leaves usually moderately large, scarcely coriaceous, all, or most of 

 them, entire. 

 B. Lenves firmly tomentulose beneath, rugose, lanceolate. 62. Q. hypoleuca. 

 BB. Leaves firmly woolly beneath, rugose, broad. 

 Leaves obovate. 



Leaves not aristate. Tom.entum rather straight 68. Q. fulva. 



Leaves aristate from the veins 70. Q. chicamolensis. 



Leaves ovate to oblong, not aristate from the veins 71. Q. dysophylla. 



BBB. Leaves somewhat loosely fleecy beneath, ratlier large. 



Leaves rugose 66. Q. floccosa. 



Leaves not rugose 92. Q. orizabae. 



BBBB. Leaves detachably woolly beneath, granular when denuded, rugose, 

 narrow. 



Cup rounded, not inrolled at margin 96. Q. rnexicana. 



Cup turbinate, inrolled at margin 97. Q. crassipes. 



BBBBB. Leaves sparsely stellate-hairy beneath, moderate. 



80. Q. oajacana. 

 BBBBBB. Leaves sparsely scurfy, rather small. 

 Leaves rugose, subcordate. 



Leaves elliptic-ovate 99. Q. castanea. 



Leaves oblong 100. Q. rugulosa. 



Leaves coasely bullate rather than rugose 80. Q. oajacana. 



BBBBBBB. Leaves glabrate, but sometimes with axillary tufts of hairs 

 beneath. 



liCaves very rugose, large, acute, cordate 75. Q. rysophylla. 



Leaves neither very rugose nor very lai'ge. 

 Leaves characteristically very blunt and rather broad. 

 Acorn thick-walled ; leaves slightly rugose. 



Leaves granular and glabrous beneath 76. Q. nectandraefolia. 



I..eaves not granular, somewhat persistently floccoso. 



77. Q lingvaefolia. 

 Acorn thin-walled; leaves not rugose. 

 Leaves broadly elliptic or oblong. 



J 



