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



the veins and midrib villous; veins about 13 to 15 on each side, much 

 branched and obviously anastomosing near the margin, scarcely 

 raised or even impressed above and very prominent (even to the 

 reticulum) beneath; petioles 12 to 18 mm. long, 1.5 to 3 mm. thick, 

 densely fulvous-tomentose. Pistillate catkins 3 to 9 cm. long, 3 to 6 

 flowers scattered on the pubescent peduncle, all except the basal 1 or 

 2 flowers aborting. Fruit annual, large; cups 3 to 4 cm. in diameter, 

 openly shallow-goblet-shaped, the scales elongate-oblong, somewhat 

 spreading or loosely appressed, finely pubescent, the lower ones 

 dorsally thickened. (See pis. 6 and 7.) 



Range: Chiriqui Province of Panama (1,300 to 1,900 m.). 



Quercus seibertii is most closely related to Q. insignis from which 

 its long peduncles and entire cordate leaves with fewer veins amply 

 distinguish it. These characters distinguish it equally well from 

 Q. davidsoniae, to which it is less closely related. 



Specimens examined: 



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

 Monte Lirio, June 27 to July 13, 1935, Seibert 225 (AA [type], MBG [2], NY); 

 January 16, 1939, Allen 1596 (MBG, USNA). 



3. Quercus davidsoniae Standi, Field Mus. Bot. Ser. 22: 14. 1940. 



"Very tall" tree or reaching only 8 m. Twigs moderately coarse 

 (2 to 5 mm. thick), fluted, from sparsely fulvous-tomentose glabrate 

 and gray or brown with evident light lenticels. Buds round, glabrate; 

 stipules caducous, about 10 mm. long, ligulate, dorsally tomentose. 

 Leaves deciduous (?), thin but firm, 9 to usually 15 cm. long, 4 to 8 

 cm. broad, oblanceolate-oblong or oblong-elliptic, attenuately acute 

 or merely acute at apex, cuneate or rounded or truncate at base, 

 scarcely cordate, mucronately or rarely crenately toothed especially 

 above, the teeth coincident with the veins, margins minutely revolute, 

 upper surface somewhat shining, from very sparsely puberulent 

 quickly glabrate, lower surface somewhat shining, from puberulent 

 glabrate or the veins pubescent; veins about 13 to 18 on each side, much 

 branched and obviously anastomosing but ultimately passing into 

 the teeth where those are present, scarcely raised above but quite 

 prominent (including the reticulum) beneath; petioles 6 to 12 mm. 

 long, about 1.5 mm. thick, from puberulent or tomentose becoming 

 glabrous. Catkins? Fruit annual, solitary on a peduncle about 1.5 

 cm. long; cups 3.5 cm. broad, hemispheric, scales deltoid-ovate to 

 oblong, attenuately narrowed but finally obtuse, thickened basally, 

 loosely appressed, densely sericeous-tomentose; acorns (immature) 

 subglobose, about 2.5 cm. long and 3 cm. broad, from buff-sericeous 

 becoming glabrate. (See pis. 8 and 9). 



Range: Chiriqui Province of Panama to central Costa Rica (1,200 to 

 1,900 m.). 



Quercus davidsoniae is a polymorphic species, and it is therefore 

 sometimes difficult to distinguish. Its specific relationship within 

 the series is not clear, but there is no doubt that it belongs in this 

 group. Its toothed leaves and glabrescent twigs readily distinguish 

 it from the other species of the series. 



Specimens examined: 



COSTA RICA.— PRoy. San Jose: between Aserri and Tarbaca, February 12. 

 1924, Standley 84186 (US); region of Zarcero, August 13, 1937, A. Smith 141 

 (F [3]); A. Smith 177 (F, MGB); May 30, 1941, A. Smith 2769 (USNA). 



PANAMA. — Prov. Chiriqui: Distr. de Boquete, Boquete, July 6, 1938, 

 Davidson 864 (F [type]). 



