4i6 PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 



Betulace^. 

 Betula AlasTcana, sp. nov. 



Leaves small, round iu outline, rounded or truncate at base, deeply 

 obtusely dentate all around, except at the biise, turned back or recurved 

 on a short petiole; medial nerve distinct, the lateral obsolete ; catkins 

 short, cvlindrical, oblong or slightly inflated, in the middle erect. 



Except that no glands are perceivable upon the stems, this species 

 agrees in all its characters with Betula glanditlosa, Michx. of Oregon. I 

 consider it as identical. 



Hab. — Chignik Bay, Aliaska. 



Alnus corylifoUaj sp. nov. 



Leaves large, broadly ovate, rounded or cordate at base, acuminate 

 or narrowly oblong-ovate, doubly dentate on the borders, primary teetli 

 large, distant more or less sharply denticulate on the back, secondary 

 nerves oblique, parallel, the lower pairs more open, all generally sim- 

 ple, except a few thin tertiary branches near the borders, passing to the 

 points of the teeth -, surftice smooth ; tibrilles rarely distinct 5 petiole 

 comparatively long. 



Kesembles Corylus M, Quarnji Heer, differing by the smooth surface, 

 the nervilles obsolete, the nerves not branching, the long petiole, &c. 



Hah. — Chugachik Bay, Cook's Inlet, Alaska. 



CUPULIFER^. 



Carpinns grandis, Ung. 



In numerous specimens. 



Mab.—^ame as the preceding. Described also from Greenland by 

 Heer. 



Fagus Deucalionis Ung. 



The collection has a single specimen of this species. Heer has de- 

 scribed it from Greenland. 



Hab. — With the preceding. 



Quercus Dallii, sp. nov. 



Leaves subcoriaceous, oblong-lanceolate, acuminate, rounded or sub- 

 cordate at base, 6 to 12cm iQ^g^ 4 to 8'='^ broad, deeply equally undulate 

 or obtusely dentate; lower lateral nerves nearly in right angle, branch- 

 ing, the others oblique, generally simple, all craspedodrome. 



The secondary nerves are more or less distant according to the size of 

 the leaves, being generally 14 pairs. 



The relation of this species is to both Q. Groenlandica and Q. Olafseni 

 Heer, two species from Greenland, from which this one especially differs 

 by the rounded orsubcordate base and the lower nerves nearly in right 

 angle. Except that the leaves are much larger, they may also be com- 



