KNOWLTON.J 



DESCKIPTION OF SPECIES. 51 



QUEKCUS URSINA n. sp. 



PI. VII, figs. 2, 3. 



QuEKCus 11. sp., Knowltoii in Merriaiii, Univ. Cal., Bull. J)ept. GimiI., Vol. II, No. 9, 

 p. 308, 1901. 



Leaves coriaceous in texture, roug-lily obovate in general outline, 

 5 to T lobed, the lobes triangular or triangular-ovate in shape, very 

 acute and apparently bristle-tipped; petiole long, relatively strong; 

 nervation consisting of a strong midrib and as many alternate, rather 

 thin secondaries as there are lobes; liner nervation not fully preserved. 



This species is represented by several very well-preserved leaves. 

 They are small leaves, about 4.5 cm. long, exclusive of the petiole, 

 and about 4.5 cm. broad. The petiole is fully 1.5 cm. in length. The 

 lobes, usually about 6 in number, are mainly triangular in shape, and 

 are entire or occasionally with a single small sharp tooth, as shown in 

 PI. VII, tig. 2. 



This species, so far as I am able to determine, finds its closest affinity 

 among living species with Qiu'rcus nana (Marsh.) Sargent, the bear or 

 scrub oak of the Eastern United States. The fossil form has a longer 

 petiole, but otherwise the shape is very similar to certain of the 

 smaller leaves of this species. 



It is barel}' possible that these leaves may be only suiall forms of 

 the polymorphous Quercus pseudo-lyrata, but I do not at present think 

 so, for out of more than a hundred examples of the latter species there 

 are no forms that can well ))e regarded as intermediate. 



Locality. ^NdiXi Horn's ranch, about 12 miles west of Mount Ver- 

 non, Grant County, Oregon. Collected by Merriam's expedition of 

 1J)()0 (type of fig. 2, in Mus. Univ. Cal., No. S-tl). White hill one- 

 half mile east of above-mentioned locality. Collected by Knowlton 

 and Merriam, July, 1901 (type of fig. 3, U. S. Nat. Mus., No. 8509). 



QUERCUS DAYANA n. Sp. 



PI. VI, %. 1. 



Leaf coriaceous, broadly elliptical-lanceolate, about equally obtusely 

 acuminate at both base and apex; margin undulate, perhaps refiexed, 

 otherwise entire; petiole very short and thick; midrib also very 

 thick; secondaries thin and obscure, apparently about 12 pairs, alter- 

 nate, emerging at a low angle, apparently ending in or very neai- the 

 margin; finer nervation not retained. 



The leaf figured— the only one thus far found — is 3.5 cm. long and 

 9 mm. broad and has the petiole only 3 nmi. long. The outline and 

 scant nerv^ation are well shown in the figure. 



This little leaf has such a familiar appearance that it would seem to 

 be a known species, and, indeed, it does resemble more or less closely 



