50 MISC. PUBLICATION 477, U. S. DEPT. OF AGRICULTURE 



not bullate; veins 8 to usually 10 or 12 on each side, branching and 

 obviously anastomosing toward the margin, the principal ones 

 slightly impressed above, very prominent beneath, the reticulum 

 somewhat raised; petioles 5 to 10 mm. long, yellow- or buff-velvety- 

 tomentose like the twigs. Staminate catkins 5 to 10 cm. long, 

 villous, sparsely flowered, the anthers well exserted. Pistillate cat- 

 kins? Fruit annual, solitary or paired on a yellow-tomentose or 

 rather glabrescent peduncle 5 to 10 mm. long; young cups rather 

 small, half-round or the base constricted, the scales ovate, thin, 

 buff-tomentose, the narrowed apices rounded, closely appressed; 

 young acorns from sericeous becoming glabrate and light brown, 

 becoming exserted while half -grown. (See pis. 64 and 65.) 



Range: British Honduras, Guatemala, Honduras, and El Salvador 

 (lower mountain slopes) . 



Quercus hondurensis is the most extreme member of the series 

 Aristatae and probably grows under the most tropical conditions, 

 ranging in elevation from 300 to 1,500 m. It is readily distinguished 

 from Q. sapotaefolia and other Central American members of the 

 series by its large characteristically acuminate and cordate leaves, 

 tomentose twigs and petioles, and lack of evident lenticels. 



Specimens examined: 



BRITISH HONDURAS.— El Cayo Dist.: Mountain Pine Ridge, San Agustin, 

 July- August 1936, Lundell 6758 (Mi, NY, US, USNA). 



GUATEMALA. — Dept. Zacapa: Sierra de las Minas, above Rio Hondo at 

 Finca Alexandria, October 11, 1939, Sieyermark 29580 and 29724 (F). 



EL SALVADOR.— Dept. Chalantenango : El Jute, 1928, Colder on 2444 (F); 

 Colder on 2447 (F, US). Dept. Moeazan: Sierra de Osicala, 1929, Calderon 

 2508 and 2510 (F). 



HONDURAS.— San Pedro Sula, Thieme 5440 (US [type]). Dept. Copan: 

 Cuesta Zompopero, between Hac. Espiritu Santo and Quebrada Mojanales, May 

 15, 1919, Blake 7449 (US) ; Macuelizo, Mav 19, 1919, Whitford and Stadtmiller 

 56 (US). Dept. Yoro: Portillo Grande, August 1937, von Hagen 1045 (F, NY); 

 Aguan River valley, vicinity of Coyoles, June 30, 1938, Yuncker, Koe-pper, and 

 Wagner 8181 (DeP, F, NY [isotypes of Q. yoroensis]) ; Yuncker, Koepper, and 

 Wagner 8185 (DeP, F. MBG, Mi, NY [isotypes of Q. yoroensis var. aguanana]) . 

 Dept. Comayagua: El Achote near Siguatepeque, Februarv 18, 1928, Standley 

 56133 (AA, F, US) ; Siguatepeque, February 14-27, 1928, Standley 56229 (AA, F 

 [tvpe of Q. comayaguana]) ; Las Jaguas, Minas de Oro, May 5, 1932, Edwards, 

 185 (AA, F). 



25. Quercus duratifolia sp. nov. 13 



Tree to 15 m. tall and 0.5 m. in trunk diameter. Twigs 1 to 2 mm. 

 thick fluted, from sparsely short-bufT-tomentose glabrate and gray (or 

 reddish brown if rubbed), lenticels few and very inconspicuous. Buds 

 2 or 3 mm. long, ovoid, acute or rounded, dull brown, glabrate or 

 pubescent about the apex; the ligulate stipules early caducous. Leaves 

 evergreen (persisting two or three seasons) , very thick and hard, 5 to 

 usually 7 or 10 cm. long, 2 to 3 or 3.5 cm. broad, elliptic to oblong or 

 oblanceolate, apex narrowly or broadly rounded, rarely aristate- 

 tipped or acute, base cordate or narrowly rounded, entire, margins 

 rather strongly revolute, little if at all crisped, upper surface glabrous 

 and highly polished (as though shellacked), lower surface more dully 

 lustrous, glabrate or persistently stellate-tomentose especially in the 



13 Quercus duratifolia sp. nov. — Arbor majuscula, ramuli 1-2 mm. crassi sparse stellati vel glabrati, folia 

 sempervirentia supra nitidissima subtus vix lucida 5-10 cm. longa 2-3.5 cm. lata elliptica vel oblanceolata 

 apice rotundata basi cordata vel rotundata integra, venis utrinque 9-15 anastomosantibus leviter promi- 

 nentibus, petioli 2-5 mm. longi, fructus annuus brevipedunculatus, cupula 12-13 mm. lata 4-6 mm. alta, 

 squamae stricte appressae, glans 12-15 mm. longa ovoidea J4 vel }i inclusa, ovula abortiva apicalia. 



