26 PROCEEDINGS OF THE AMERICAN ACADEMY. 



+-t- Petioles glabrous. 

 ++ Leaves pilose on the nerves beneath. 



A. arguta, SrACH. Bark of the branches and branchlets brown, 

 glabrous : buds short-stalked, glabrous : leaves ovate or obovate, acute 

 or bluntish, rounded or sonaevvhat narrowed at base, finely but sharply 

 double-serrate, 0.4 to 1 dm. long, 3 to 7.5 cm. broad, sparingly glandular- 

 dotted, but glabrate above, paler beneath and pilose especially along the 

 nerves ; petiole slender, 1 to 2.5 cm. long : peduncles slender, glabrate ; 

 staminate aments 4 to 7 in terminal panicles (becoming about 1 dm. 

 long) : the dark reddish-brown strobiles 3 or 4, sessile, snb-cylindric, 

 when mature 2 to 3 cm. long, about 1 cm. thick : the cuneate obovate 

 or oblong nutlet 2.5 cm. long, 1.5 mm. broad, somewhat broader than 

 the coriaceous wing. — Ann. Sci. Nat. ser. 2, xv. 205. A. acuminata, 

 a genuina, Hemsl. Biol. Cent.-Am. Bot. iii. 165, not Regel. A. jor- 

 ullensis, var. castaneae/olia, Hemsl. 1. c. IGG, not Regel. Bettda arguta, 

 Schlecht. Linnaea, vii. 139. — Vera Ckuz, Mt. Orizaba, April 10, 

 1867 (Bilimek, no, 404), without date (Botteri, no. 857) ; alt. 3400 m., 

 Aug., 1891 (ff. E. Seaton, no. 231). Originally described from Vera 

 Cruz and Tamaulipas. 



■w. ^-1. Leaves glabrous, or at most only slightly pubescent when young. 



A. glabrata, n. sp. Bark of the branches brown, glabrous : buds 

 short-stalked, sparingly puberulent or glabrous : leaves oblong-lanceolate 

 or elliptic, long-acuminate, narrowed or slightly rounded at base, coarsely 

 and doubly serrate-dentate especially above, paler and dull beneath, the 

 yellowish or brownish nerves prominent ; petiole to 1 to 3.5 cm. long : 

 peduncles thickish, glutinous ; staminate aments 3 or 4, becoming 7 or 8 

 cm. long ; the dark brown or blackish strobiles oblong or cylindric, ses- 

 sile or short-stalked, in maturity 1.8 to 2.8 cm. long, 9.5 to 14 mm. thick : 

 nutlets oblong to oblong-lanceolate, 3 to 5 mm. long, 1.5 to 2 mm. broad, 

 with slightly narrower coriaceous wings. — A. acuminata, Sargent, 1. c, 

 in part, not HBK. — Guanajuato, Mt. San Nicholas, April, 1882, 

 and Santa Rosa, April, 1901 {A. Duges) : Queretaro, between Mexico 

 and Queretaro, November, 1827 {Berlandier, no. 1294): Hidalgo, 

 Dublan, December 4, 1902 {C. G. Pringle, no. 11,179): Mexico, Val- 

 ley of Mexico, June 1, 1865-66 {Bourgeaa, no. 244), Dec. 9, 1892 

 (C. G. Pringle, no. 4361) ; near Tizapan, alt. 2300 m., Jan. 30, 1899 

 (C. G. Pringle, no. 8022): Oaxaca, Valley of Oaxaca, alt. 1570 to 

 1786 ra., Sept. 8, 1894 {E. W. Nelson, no. 1254); near Hu:ijuapam, 

 alt. 1725 to 2000 m., Nov. 10, 1894 (A\ W. Nelson, no. 1976) ; Coyula 



