THE CENTRAL AMERICAN SPECIES OF QUERCUS 27 



Series Adatae ser. nov. 8 



Large trees with markedly whitened strigose twigs ; stipules usually 

 persistent; leaves moderate, elliptic to oblanceolate, obtuse, narrowly 

 rounded; veins usually impressed above and very prominent beneath, 

 much branched and anastomosing, the midrib usually strigose beneath 

 toward the base; petioles short; fruit moderate, cotyledons unequal. 



Range: Guatemala to Costa Rica. 



Includes: Q. adata C. H. Mull. (type). 



The series Adatae is a relatively well marked entity distinguished 

 from the other series by its pubescence, thin leaves, persistent stipules, 

 short petioles, and whitened twigs. Although most of these charac- 

 ters appear also in other groups, in none of them is the combination 

 encountered. The series seems to be a small-fruited analogue of the 

 Oocarpae, but no closer relationship can be assigned to it. 



9. Quercus aaata sp. nov. 9 



Large tree up to 22 m. tall and with a trunk diameter of more than 

 2 m. Twigs slender (1.5 to 2.5 mm.), fluted, strigose and appressed- 

 stellate, becoming glabrous and gray or white with scarcely evident 

 lenticels the second season. Buds round-ovoid to elliptic, 3 to 5 mm. 

 long, glabrous, straw-colored; stipules persistent, 6 to 10 mm. long, 

 ligulate and glabrous or subulate and strigose about the terminal bud. 

 Leaves deciduous, thin but firm and rather hard, 6 to 16 cm. long, 2 

 to 6 cm. broad, elliptic or oblanceolate to oblong-obovate or rhombic, 

 much narrowed toward the apex or only slightly so, acute but the tip 

 finally narrowly rounded or rarely broadly rounded, basally attenuate 

 and very narrowly cuneate to rounded, subentire to obscurely and 

 coarsely toothed near the apex, the margins flat or minutely revolute, 

 upper surface dark green, dull, glabrous except for the midrib which 

 is strigose toward the base, lower surface shiny or dull, glabrous 

 except the strigose midrib or fulvous-tomentose along the midrib; 

 veins about 10 to 15 on each side, rather regularly parallel and lacking 

 intermediates or irregular and with intermediates, much branched 

 and obviously anastomosing near the margin, slightly raised (the 

 principal ones within shallow grooves) on the upper surface, quite 

 prominent (including the reticulum) below; petioles 2 to 7 (usually 

 about 4) mm. long, strigose. Catkins? Fruit annual, solitary or 

 paired, pedunculate; cups about 2.5 cm. broad, hemispheric or shal- 

 lowly cup-shaped, the scales ovate with abruptly narrowed oblong 

 tips loosely appressed, much thickened and velutinous at the bases, 

 the apices strigose and brown; acorns ovoid, 2 to 2.5 cm. long, scarcely 

 2 cm. broad, glabrate, about one-third to one-half included. (See 

 pis. 23 to 26.) 



Range: Guatemala, Honduras, and Costa Rica (1,500 to 2,400 m.). 



Quercus adata (from the Greek, aaatos, invincible) is the only species 

 known in the series Adatae. It could scarcely be confused with any 

 other species in our range, except in its obtuse-leafed form in Costa 



8 Series Aaatae ser. nov. — Arbores grandes, ramuli albi strigosi, stipulae persistentes, folia mediocria ellip- 

 tica vel oblanceolata obtusa ad basin anguste rotundata, venis supra impressis subtus prominentibus ramo- 

 sis et anastomosantibus, costa subtus ad basin strigosa, petioli breves, fructus annuus mediocris, cotyledones 

 inaequales. 



8 Quercus aaata sp. nov. — Arbor grandis, ramuli 1.5-2.5 mm. crassi glabrati, gemmae 3-5 mm. longae 

 glabrae, folia decidua chartacea 6-16 cm. longa 2-6 cm. lata elliptica vel oblanceolata vel obovata ad apicem 

 angustata ad basin attenuato-cuneata vel angusto-rotundata integra vel ad apicem dentata glabra costis 

 strigosis vel fulvo-tomentosis exceptis, venis utrinque 10-15 ramosis et anastomosantibus, petioli 2-7 mm. 

 longi, fructus annuus, cupula 2.5 cm. lata hemispherica vel minus profunda, glans 2-2.5 cm. longa ovoidea. 



