TRELEASE— UNUSUAL BLACK OAKS. 33 



Quercus {Erythrohalanus) radiata n. sp. 



Twigs stout, densely yellowish-tomentose, remaining somewhat 

 velvety for several seasons. Buds rounded, small (2-3 mm. in diam- 

 eter), somewhat tomentose. Leaves large (9-13 cm. long and 

 broad), deciduous, pandurate-orbicular, at most deltoid-pointed, 

 cordate-auriculate, not hollowed between the radiate aristate ends 

 of the veins, dull and glabrous except for the impressed veins above, 

 detachably rusty-tomentose beneath with the denuded surface some- 

 what bullulate ; petiole yellow-tomentose, 3x10-15 mm. Flowers 

 unknown. Fruit annual, very small, in somewhat loosely yellow- 

 stellate spikes 60-80 mm. long, densely fruited above the middle ; 

 cup very small (7-8 mm.), hemispherical, with thin appressed blunt 

 f ulvous-tomentose scales ; acorn elongated ovoid, 8 mm. long, 

 cane scent. 



Western Sierra ]\Iadre of IMexico {Rose, 22^0, Aug. 13, 1897), 

 from the top of the range near Santa Teresa, Tepic, — the type in 

 the United States National Herbarium, for the privilege of study- 

 ing which I am indebted to Dr. Rose, of that institution. 



Quercus {Erythrohalanus) Conzattii n. sp. 



Twigs stout, gray-tomentose even through the second year. 

 Buds ovoid, rather small (3x5 mm. or more), somewhat hairy. 

 Leaves large (8-10x9-12 cm.), deciduous, orbicular, very obtuse 

 to short-acuminate, cordate, very slightly hollowed between the tips 

 of the aristate veins, glossy, glabrous except for the impressed veins 

 and convex above, densely grayish-woolly beneath ; petiole gray- 

 tomentose, 3 x 5—15 mm. Flowers unknown. Fruit annual, 

 small, in woolly spikes 40-50 mm. long, densely fruited throughout ; 

 cup small (scarcely 10 mm.), hemispherical, with thin appressed 

 blunt glabrate scales; acorn ovoid, scarcely 10 mm. long, canescent. 



Southern Cordillera of IMexico, at 2,000 m. {Conzatti, igoo, 

 June 29, 1907), from the Cuesta de Huauchillo, Nochixtlan, Oaxaca, 

 — the type in the herbarium of the Field Museum at Chicago, for 

 the privilege of studying which I am indebted to Dr. C. F. Alills- 

 paugh, of that institution. 



Explanation of Plates. 



Illustrations, reduced one half, of the types of Quercus Urbani, Quercus- 

 radiata and Quercus Coticattii; from photographs by the author. 



