10/2 APPENDIX. 



gradually acuminate, 12 cm. long or less, rather coarsely and sharply 

 serrate, mostly cordate at the base but sometimes rounded, dark green 

 and glabrous above, yellow- green and more or less pubescent on the 

 veins beneath when mature; petioles pubescent, about i cm. long; 

 staminate catkins 6 cm. long or more, their scales broadly ovate and 

 obtusish; strobiles oblong-cylindric, 2-3 cm. long, very short-stalked 

 or sessile, their scales 4-6 mm. long, pubescent, nearly or quite as wide 

 as long, 3-lobed above the middle, the wedge-shaped part below the 

 lobes short, the margins ciliate; nut narrowly obovate to oblong, 2-3 mm. 

 long, mostly narrower than its wings. Mass, to Que. and Mich., south 

 to southern N. Y., Penn., and in the mountains to Ga. 



P. 330, after Alnus Alnobetula, insert: 



la. Alnus mdllis Fernald. HAIRY GREEN ALDER. Similar to A. 

 Alnobetula, but more pubescent, especially on the young twigs and the 

 under leaf- surf aces, which are often quite densely hairy. Leaves finely 

 unequally serrate, 10 cm. long or less; fruiting pistillate aments, aver- 

 aging larger, 1.2-2 cm. long; nut oblong, its thin wing about as broad 

 as the body. Rocky places and swampy soil, Newf. to Man., Mass., 

 N. Y. and Mich. May-June. 



ib. Alnus Mitchelliina M. A. Curtis. MITCHELL'S ALDER. Resem- 

 bles A. mollis, but the young twigs are glabrate, or only sparingly 

 pubescent. Leaves broadly ovate or nearly orbicular, blunt or short- 

 pointed at the apex, rounded or often quite deeply cordate at the base, 

 the veins of the under side quite densely pubescent, otherwise glabrous 

 or with a few scattered hairs; staminate aments stout; ripe pistillate 

 aments as large as those of A. mollis, or larger, much larger than those 

 of A. Alnobetula. High mountains of Va., N. C., and Eastern Tenn. 

 May. 



P. 330, after Alnus inckna, insert: 



2a. Alnus Noveborace"nsis Britton. NEW YORK ALDER. A shrub 

 or small tree, sometimes 8 m. tall, with a trunk 1.5 dm. thick. 

 Young twigs and petioles densely pubescent; leaves oblong to obovate, 

 acute at both ends, 12 cm. long or less, sharply irregularly serrate, very 

 densely pubescent on the prominent veins beneath, otherwise glabrous 

 or nearly so, dark green above, paler green but not at all glaucous on 

 the under side; ripe pistillate aments numerous, oblong, 1.5 cm. long, 

 very short-stalked; nut oval, about one-half longer than wide, nar- 

 rowly margined. Woods and thickets near the coast, southeastern N. Y. 

 Type from Grant City, Staten Island. 



P. 339, after Celtis occidentalis, insert: 



la. Celtis canina Raf. DOG HACKBERRY. Taller than C. occiden- 

 talis, the trunk sometimes nearly a meter thick. Leaves broadly lanceo- 

 late or ovate-lanceolate, light green, 8-16 cm. long, thin, attenuate- 

 acuminate, smooth on the upper surface when mature, pubescent be- 

 neath, at least on the veins; petioles slender, 2 cm. long or less, about half 

 as long as the fruiting peduncles; drupe oblong to globular, purple, 

 about i cm. long. In rich soil, N. Y. to 111., S. Dak., Pa. and Mo. 

 April-May. 



P. 339, after Celtis crassifolia, insert: 



2a. Celtis Georgiana Small. GEORGIA HACKBERRY. A shrub or small 

 tree, with pinnately arranged branches, the young twigs puberulent. 

 Leaves small, mostly less than 5 cm. v long, short-petioled, obliquely ovate, 

 subcordate, acute or short-acuminate, sharply few-toothed or some of 

 them entire, firm, rough or roughish above, prominently reticulate- 



