1888.] PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 17 



Salix variaus Gopp. 



One specimen ; Museum number, 2596. 

 Salix raena ? Heer. 



Two specimens; Museum number, 259-1. 

 Salix Engelhardti, u. sp. Plate vm, fig. 2. 



Leaves oblanceolate or narrowly obovate, rounded to the point 

 (broken), gradually narrowed to the base; borders serrate with short 

 appressed teeth; medial nerve narrow, secondaries equidistant, camp- 

 todrome, and parallel from the base. 



The leaf, 8 cm long, 3 C1 " broad toward the apex, is gradually narrowed 

 to thepetiole. Except for the secondaries, which are open at an angle of 

 divergence of 50 to 60 degrees curved in passing toward the borders, the 

 areolation is obsolete. It is comparable by its form, the dentation of the 

 borders, and its nervation to the living Salix discolor Muhl. 



Two specimens; Museum number, 2589. 

 Salix, amygdalifolia Lx. 



Two specimens ; Museum number, 2587. 

 Quercus Horniana, n. sp. Plate v, fig. 6. 



Leaves small, subcoriaceous, elliptical oblong, narrowed upward to a 

 point, rounded to a short, thick petiole, obtusely dentate; medial 

 nerve thin; secondaries at an acute angle of divergence, simple, straight 

 to the point of the teeth, numerous alternate and parallel ; the two low- 

 est pairs more open, slightly curved back, and with few branches. 



The angle of divergence of the secondaries is 30 degrees; they are 

 comparatively thick, less than 5 1U1 » distant. The appearance of the leaf 

 is like that of a Castanea, but no species of this genus has the leaves so 

 short dentate and the secondaries ramified. It is most like Bryophyl- 

 lum (Quercus) Bruneri Ward (Synop. of the Fl. ofthe Laramie Group, PI. 

 xxxvn, figs. 6-9), from which it differs essentially by the small size, the 

 secondaries straight, even slightly curved backward rather thau upward 

 and the lowest ramified. It is also comparable to Quercus densiflora 

 Hook & Arn. (Bot. Beechey, p. 391, of California), but has the leaves 

 comparatively shorter, not tapering, but rounded at base. 



One specimen; Museum number, 2556. 



Quercus pseudolyrata Lx. Plate x, fig. I. (Foss. PI. of the Anrif. Gravel, p. 8 

 PI. ii, figs. 1-2.) 



The leaves are cut into deep, oblong linear or lanceolate lobes, poiuted 

 Br acuminate. With this exception the description /. c. is correct. 



Twelve specimens; Museum number, 2565. 

 Quercus pseudolyrata Lx., var. acutiloba n. var. Plate xi, fig. 1. 



Four specimens; Museum number, 2566. 

 Juercus pseudolyrata Lx., var. angustiloba n. var. Plate xi, fig. 2. 



One specimen; Museum number, 2567. 



Proc.N.M.88 2 vViHM , /WT* 



