CATALOGUE. 323 



times r long) and covered with divergent branched subverticillate prickles ; 

 nut 6" in diameter, obtusely triangular, glabrous. — California and Oregon. 

 Washoe Mountains, Nevada, above Carson City; 6,500 feet altitude. (1,087.) 



BETULACEiE. 



Betula occidektalis. Hook. Flor. Bor. Amer. 2. 155. Branches dark 

 reddish-brow^n, copiously sprinkled with resinous warts ; leaves 1-li' long, 

 9-15" wide, thin, broadly ovate, acute, truncate at base or sometimes sub- 

 cuneate or slightly cordate, with rarely more than four pairs of nerves, smooth 

 and resinous above or minutely appressed-hairy, lighter-colored beneath, 

 usually with scattered hairs upon the petioles, margins and veins, not punc- 

 tate, somewhat obscurely lobed or doubly toothed, the serratures short and 

 glandularly raucronate ; petioles slender, 3-5" long ; fruiting aments broad- 

 cylindrical, 1' long ; peduncles suberect, leafy, 3-5" long ; scales pubescent, 

 ciliate, the lateral lobes divergent, quadrangular ; seed with wings twice 

 broader than the body. — A shrub 8-1 2° high, with numerous scarcely erect 

 stems, rarely 3-4' in diameter, and a dark purplish- brown close smooth bark. 

 From the Rocky Mountains in latitude 54° to Washington Territory and 

 southward to Colorado. — Frequent on stream-banks in the Wahsatch and 

 Uintas; 5-6,000 feet altitude. It is 339 Parry, 518 Hall & Harbour, and 

 528 Vasey, from Colorado, and was also collected by Nuttall. Eegel makes 

 this both the type of his subspecies occidentalis under B. alba, and his Var. 

 humilis 0^ &\\hi\ndc\e& papyrifera, adding to both certain forms o^ B. papyracea. 

 The White Mountain variety of B. papyracea is quite distinct from the pres- 

 ent, and cannot be considered as tending to unite the two species. Plate 

 XXXV. Fig. 1. End of branch; natural size. Figs. 2, 3. Scales. Figs. 

 4, 5. Seeds ; enlarged four diameters. (1,088.) 



Betula glandtjlosa, Mx. From Newfoundland and Labrador, North- 

 ern New England and the Grreat Lakes to the Arctic Ocean and Behring 

 Strait, Alaska, Oregon, and Colorado. Found on stream-banks in the Uintas ; 

 8-9,000 feet altitude. (1,089.) 



Alnus incana, Willd., Var. Glauca, Ait. Leaves ovate, doubly and 

 sharply serrate, obtuse at base or shghtly cordate, rarely subcuneate, sub- 

 acute or rarely subacuminate ; more or less pubescent on both twigs and 

 leaves, or sometimes nearly glabrous ; seeds with a narrow coriaceous mar- 

 gin. — From New England to Saskatchewan ; thence south to New Mexico 



