18 MISC. PUBLICATION 4 7 7, U. S. DEPT. OF AGRICULTURE 



61. Fruit annual. 



64. Petioles 5 mm. long or less, leaves coarsely and diver- 

 gently toothed above the middle. 



40. Q. BREXESII. 



64. Petioles usually over 10 mm. long, leaves toothed or at 



least aristate throughout or if entire below the 



middle then the toothing merely aristate and not 



coarse. 



65. Leaves coarsely toothed throughout and the teeth 



long-aristate, petioles 20 to 30 mm. long and 



very slender, glabrous 42. Q. paxtalexsis. 



65. Leaves merely aristate from the margins or from 

 very low teeth, petioles seldom over 15 mm. 

 long, from tomentose becoming glabrate. 



43. Q. AXGLOHOXDUREXSIS. 



I. SUBGENUS LEPIDOBALANUS (Endl.) Oerst., Vidensk. Medd. 



Xaturli. Foren. Kjobenh. 1866: 65. 1866. 



Lepidobalanus Endl., Gen. PL Sup. 4 2 : 24. 1847 (as subdivision 



of Quercus without indication of rank). 

 Macrobalanus Oerst., K. Danske Vidensk. Selsk. Skrift. 9: 370. 



1871 (as subgenus) . 

 Leucobalanus Engelm., Trans. Acad. Sci. St. Louis 3: 381. 1876 



(as subgenus). 

 Macrobalanus Sekwarz, Xotizbl. Bot. Gart. Mus. Berlin-Dahlem 



13: 8. 1936 (as genus). 



Shrubs or often large trees with the bark usually rough, scaly, 

 soft, and gray or white; wood pale, the larger ducts often plugged by 

 tyloses, the smaller (summer wood) ducts thin-walled and angular or 

 thick-walled (3m or more) and round; leaves entire, often round-lobed 

 (in this case usually deciduous) or at most serrate with the teeth 

 mucronate-tipped (in this case either deciduous or evergreen), never 

 aristate- or spinose-tipped; stamens 7 to 9, anthers rounded, emarg- 

 inate; styles short, the stigmas short, broad, horizontally spreading; 

 fruit always annual (maturing in 1 year), cup scales elongate-narrowed, 

 often corky -thickened basally, abortive ovules basal, more or less 

 immersed in tomentum, the inside of the acorn shell otherwise gla- 

 brous. 



Type species: Quercus robur L. 



Series Insignes Trel., Mem. Nat. Acad. Sci. 20: 42. 1924. 



Large trees with coarse fulvous-tomentose twigs; stipules caducous 

 or persistent; leaves large, deciduous (?), typically oblanceolate to 

 obovate, ovate or elliptic, subentire or serrate, glabrate above and 

 usually pubescent beneath; petioles short or moderate; fruit large, 

 the cup scales much thickened basally and loosely appressed or 

 spreading apically, cotyledons unequal. 



Kange: Veracruz to Guatemala and Panama. 



Includes: Quercus insignis Mart, and Gal. (type), Q. seibertii C. H. 

 Mull., and Q. davidsoniae Standi. 



1. Quercus insignis Mart, and Gal., Bui. Acad. Brux. 10 1 : 219. 

 1843. 



Quercus schippii Standi., Cam. Inst. Wash. Pub. 461: 53. 1936. 



Large tree to 30 m. tall with a trunk diameter of 1 m. Twigs 4 to 

 6 mm. thick, fluted, densely yellow-tomentose the first year, becoming 



