STANDLEY TREES AND SHRUBS OF MEXICO. 183 



27. Quercus circinata Nee, Anal. Cienc. Nat. 3:272. 1801. 

 Type locality, between Tixtla and Cliilpancingo, Guerrero. 



Small deciduous tree, 8 to 10 meters high, with stout, toraentulose or glabres- 

 cent twigs and small canescent buds; leaves large (6 to 10 cm. wide, 15 to 2.5 

 cm. long), glabrate above, velvety beneath, oblanceolate, blunt-acuminate, 

 rounded at base, short-petioled, crisped, crenate-toothed ; acorn elongate-ovoid, 

 15 mm. in diameter, 20 to 30 mm. long, one-third included, the half-round cup 

 with acute appressed scales. " Kncina roble." (Michoacan, Guerrero). 



28. Quercus mag-noliaef olia Nee, Anal. Cienc. Nat. 3 : 268. 1801. 

 Type locality, between Tixtla and Cliilpancingo, Guerrero. 



Like the preceding; differing little except in its more oblanceolate-obovate, 

 less acuminate, and less crenate leaves. 



29. Quercus lutea Nee, Anal. Cienc. Nat. 3:268. 1801. 

 Type locality, between Tixtla and Chilpancingo, Guerrero. 



Like the preceding ; differing little except in its somewhat pandurate leaves. 



30. Quercus peduncularis Nee, Anal. Cienc. Nat. 3: 270. ISOl. 

 Quercus tomentosa Willd. Sp. PI. 4:437.1805. 



Type locality, in the western Sierra Madre, above the Rio Mescala, between 

 Acapulco and Mexico City. 



Small (deciduous?) tree, with moderate glabrescent twigs and small hairy 

 buds; leaves rather large (5 cm. wide, 12 cm. long), scurfy along the midrib 

 above and rather thinly woolly beneath, elongate-elliptic, subacute, somewhat 

 cordate, short-petioled, sinuate ; fruit stalked ; acorn ovoid, 10 mm. in diameter, 

 15 mm. long, less than half included, the rather shallow cup with acute ap- 

 pressed scales. " Encina " {Ramirez). 



31. Quercus hartwegi Benth. PI. Hartw. 432. 1840. 



Quercus obtusata hartwegi A. DC. in DC. Prodr. 16 ": 27. 1864, in part. 



Quercus pandurata harttvegi Wenzig, Jahrb. Bot. Gart. Berlin 3:197.1884. 



Type locality, Tuxpan, near Angangueo, IMiclioacSn. 



Deciduous tree with moderate glabrescent twigs and small hairy buds ; leaves 

 moderate (4 to 5 cm. wide, 7 to 8 cm. long), characteristically velvety beneath 

 and along the midrib above, broadly elliptic or sometimes pandurately obovate, 

 obtuse, slightly cordate, short-petioled, repand to coarsely crenate or toothed ; 

 fruit often long-stalked ; acorn round-ovoid, 15 mm. in diameter, half included, 

 the flaring saucer-shaped cup 20 to 25 mm. in diameter, with acute, rather loose 

 scales. 



32. Quercus laxa Liebm. Overs. Dansk. Vid. Selsk. Forh. 1854:181.1854. 

 Qtiercus xylina Scheidw. Hort. Belg. 1837:321.1837.- 



Quercus reticulata laxa "Wenzig, .Jahrb. Bot. Gart. Berlin 3: 195. 1884. 



Jalisco, Tepic, Colima, and Michoacan ; type locality, somewhere in the west- 

 ern Sierra Madre. 



Very like the preceding; fruiting cup smaller (15 mm. broad), with more 

 keeled and appressed scales. 



33. Quercus laeta Liebm. Overs. Dansk. Vid. Selsk. Forh. 1854: 179. 1854. 

 Quercus pandurata laeta Wenzig, Jahrb. Bot. Gart. Berlin 3:197.1884. 

 San Luis PotosI, Mexico; and Puebla ; type locality, Grande. 



Twigs rather slender, somewhat scurfy or glabrescent ; buds small, glab- 

 rescent ; leaves rather small (2 to 3 cm. wide, 7 to 8 cm. long), short-tomentose 

 beneath and on the midrib above, lanceolate or oblong-elliptic, obtuse, rounded 

 at base, very short-petioled, entire or crenate ; fruit slender-peduncled ; acorn 

 ovoid, 10 mm. in diameter, 15 mm. long, the thin half-round cup with small 

 subacute appressed scales. 



55268—22 2 



