THE CENTRAL AMERICAN SPECIES OF QUERCUS 59 



rather prominent pale lenticels, becoming gray. Buds about 2 mm. 

 long, round to narrowly ovate, obtuse, straw-colored, glabrous or the 

 scales minutely ciliate, the ligulate stipules early caducous. Leaves 

 deciduous (?), thin but firm and coriaceous, 8 to usually 18 or even 

 25 cm. long, 2 to usually 5 or sometimes 7 cm. broad, narrowly or 

 broadly lanceolate to oblanceolate, apex narrowly acute to long- 

 acuminate, not strikingly aristate-tipped, base cuneate to very 

 narrowly rounded, entire, margins minutely re volute and very finely 

 crisped, upper surface glabrous and shiny, lower surface glabrous or 

 usually sparsely stellate-pubescent along the midrib toward the base, 

 somewhat shining; veins about 15 to 18 or 20 on each side with 

 evanescent intermediates, repeatedly branching and inconspicuously 

 anastomosing near the margin, very slightly impressed above but 

 raised within the grooves, rather prominent beneath, the fine reticulum 

 somewhat raised on both surfaces; petioles 2 to 4 mm. long, as much 

 as 2 mm. thick, winged, glabrate or pubescent like the twig, dark red- 

 dish brown at the swollen base. Catkins? Fruit probably annual, 

 solitary or paired or several scattered on a peduncle 1 to 2 or 4 cm. 

 long, 1.5 to 3 mm. thick, often irregularly bent in a zigzag at the points 

 of attachment of the cups, glabrate, reddish brown with conspicuous 

 lenticels; cups 13 to 18 mm. broad, 5 to 10 mm. high, deeply saucer- 

 shaped to goblet-shaped, often somewhat constricted at the base, the 

 scales broadly triangular-ovate, rounded at apex, thin and very closely 

 appressed, the base sometimes appearing thickened but merely pro- 

 truded by the bud in its axil, finely buff-sericeous but the apices and 

 margins glabrate; acorns 7 to 15 mm. long, 11 to 15 mm. broad, 

 hemispheric to broadly ovate, apex nearly flat or rounded, from 

 minutely sericeous-puberulent tardily glabrate, one-fifth included to 

 completely covered (in equally mature material, varying with the 

 form of the acorn) ; abortive ovules basal. (See pis. 79 and 80.) 



Range: Wet forests of upper Panama and Costa Rica (1,300 to 

 1,900 m.). 



Quercus gulielmi-treleasei differs from the other entire-leaved short- 

 petioled species of Erythrobalanus by its small, pedunculate fruit and 

 large leaves or by its very long-acuminate leaf apices and very short 

 petioles. It is apparently only remotely related to Q. seemanni, its 

 closest ally, but aside from the larger leaves, very short petioles, and 

 rather longer-stalked , smaller fruit of Q. gulielmi-treleasei, distinguish- 

 ing characters are difficult to ascertain. 



It seemed advisable not to employ Trelease's herbarium name, Q. 

 chiriquina, for this species because of the similarity of the name to Q. 

 chiriquiensis, another herbarium name of long standing which has 

 even recently been used to designate Q. seemanni. As this new species 

 is very similar to Q. seemanni, it would have been particularly con- 

 fusing to validate Trelease's name, and therefore it is proposed to 

 honor him by naming for him a species which he has recognized as 

 distinct in a genus with which he is so closely identified. 



Specimens examined: 



COSTA RICA. — Prov. Cartago: El Mufieeo, on Rio Navarro south of Na- 

 varro, February 8-9, 1924, Standley 83875 (F, US) ; March 6-7, 1926, Standley and 

 Torres 51223 (F, US); Standley and Valerio 51382 (F, US). 



PANAMA. — Prov. Chiriqui: valley of upper Rio Chiriqui Viejo, vicinity of 

 Monte Lirio, June 27- July 13, 1935, Seibert 226 (MBG [tvpe]) ; between Boquete 

 and Finca Lerida, April 4, 1937, Allen 302 (111, MBG, USNA). 



