APPENDIX. 1071 



long; petals broadly linear or linear-lanceolate, about as long as the 

 sepals; lip ovate or oblong-ovate, about 5 mm. long, the callosities 

 somewhat incurved. In woods and swamps, Ohio, Ala. and La. Oct. 



P. 313, after Salix lucida, insert: 



4a. Salix serissima (Bailey) Fernald. LATE-FRUITING WILLOW. A 

 Tub sometimes 4 m. high, with glabrous brown shining twigs. Leaves 

 lanceolate to elliptic-lanceolate, 4-10 cm. long, 1-3.5 cm - wide, finely 

 glandular-serrate, acute or acuminate, firm, dark green and shining 

 above with a light green midrib, pale green and dull beneath, glabrous; 

 petioles 12 mm. long or less, bearing large glands at the apex; aments 

 borne at the ends of short leafy branches, the rachis, peduncles, and 

 scales densely white-pilose, the staminate oblong, 2 cm. long or less; 

 pistillate aments loosely flowered, becoming 4 cm. long or less; capsules 

 glabrous, shining, larger than those of 5. Lucida, ripening from August 

 to October. In bogs and wet meadows, Mass, to Ont., Minn., N. J., 

 Ohio, and Ky. May-June. 



P. 316, after Salix interior, insert: 



2ia. Salix Wheeled (Rowlee) Ryd.b. WHEELER'S WILLOW. A 

 low shrub, related to 5. interior, but in habit and pubescence more 

 resembling the western 5. argophylla Nutt. Young twigs appressed- 

 silky with white hairs, becoming glabrous toward the end of the first 

 season; bark of older twigs grayish brown; leaves linear-lanceolate 

 to oblong-lanceolate or oblanceolate, 7-8 cm. long, 1-1.5 cm - wide, 

 sessile, rather strongly veined, densely white-silky on both sides, evenly 

 denticulate, rather abruptly short-acuminate; aments borne at the ends 

 of short leafy branches, shorter and denser than those of S. interior, 

 clustered; bracts oblong, light brown, villous; capsule pubescent. Sandy 

 beaches, N. B. to Mich., N. Y. and 111. June-July. (5. interior Wheel- 

 eri Rowlee.) 



P. 328, after Betula populifolia, insert: 



la. Betula coeriilea Blanchard. BLUE BIRCH. Similar to B. populi- 

 folia, but larger and stouter, the white bark freely separating in thin 

 sheets. Foliage bluish green; young shoots warty; leaves ovate, or 

 sometimes deltoid-ovate, long-petioled, irregularly sharply serrate, 

 truncate to broadly cuneate at the base, the apex gradually acuminate 

 to long- acuminate, both surfaces glabrous when mature; ripe pistillate 

 aments stalked, cylindric or oblong-cylindric, 1-3.5 crn - l n g; bracts 

 densely puberulent, their lateral lobes larger than the middle one; nut 

 narrower than its wings. Woods, Vermont. May. 



P. 328, after Betula nigra, insert: 



4a. Betula Sandbergi Britton. SANDBERG'S BIRCH. Young twigs 

 loosely pubescent, green, becoming brown. Leaves rhombic-ovate, 

 acute, rather evenly serrate, dark green and strongly netted-veined 

 on the upper side, light green, very glandular and slightly pubescent 

 on the veins beneath, 6 cm. long or less, cuneate at the base; petioles 

 glabrous, 1.5 cm. long or less; staminate catkins 6 cm. long or more; 

 strobiles slender-stalked, cylindric, 2-2.5 cm - l n g> about 6 mm. thick, 

 their scales about 4 mm. long, pubescent, 3-lobed at the apex, the mid- 

 dle lobe a little longer than the blunt ascending lateral ones, all the 

 lobes blunt; nut oval to obovate, 1.5 mm. long, rather narrower than 

 its wings. Swamps, Hennepin County, Minn., and Saskatchewan. 



P. 329, after Betula lutea, insert: 



5a. Betula Alleghanie*nsis Britton. SOUTHERN YELLOW BIRCH. 

 Resembling B. lenta and B. lutea. Bark either close and furrowed, or 

 peeling off in thin yellowish-gray layers; young twigs long-pubescent, 

 becoming brown and shiny; leaves ovate to ovate-oblong, usually 



