326 DICOTYLEDONOUS PLANTS.. 



HAB. Mountains. Can. and N. S. W. to N. W. Terr. May. 

 lp .A shrub about 2 feet high. 



8. B. nana Linn. :' very smooth,; leaves orbicular, crenate, reticular- 

 veined beneath ; scales of the'ament deeply 3-parted; segments ob- 

 long; seeds orbicular, nearly -wingless. 



HAB. White Mountains, N. H. N. to Hudson's Bay. April, 

 May. *?. A sltrub 1 or 2 feet high, with small leases. 



6. ALNUS. WlUd. 



Monoecious. STERILE FL. Ament long, cylindrical ; 

 scales 3-lobed, 3-flowered, Perianth 4-parted. Stamens 4. 

 FERTILE FL; Ament ovate ; scales subtrifid, 2-flowered. 

 Perianth none. Styles 2. Nut compressed. 



. Monoecia. Tetrandria. 

 



1. A. serrulata JVdld. : leaves obo~vate, acuminate, veins and axils of 

 the veins hairy beneath ; stipules elliptic, obtuse.- 



HAB. Swamps and banks of rivers. Can. to Car. March. *>. 



A shrub 610 feet high, with alternate leaves. Sterile flowers 



in a long pendulous ament ; fertile ones hort and rigid, form- 



. . ing a persistent cone." Alder. 



2. A. undvlata, Wild, .'leaves ovate-oblong, acute, unequally serrate, 

 undulate; petioles and veins beneath hairy ; stipules ovate-oblong. 

 A. crispa Pursh. Bchela crisp a Mich. 



HAB. Can. and mountains in N. S. April. *>. A shrub 3, 4 

 feet high. 



7. CARPINUS. Linn. 



Monoecious. STERILE FL. Ament long-cylindric ; scales 

 ciliate at base. Stamens 8 14, somewhat bearded at the top. 

 FERTILE FL. Strobile lax ; scales leafy, ^-flo'wered. Stig- 

 mas 2. Nut bony, ovate, sulcate, 1 : seeded. 



Monoecia. Polyandria. 



C. amcricana IViUd. : leaves oblong-ovate, acuminate, unequally ser- 

 rate ; scales of the strobile 3-parted, the middle segment oblique, ovale- 

 lanpeolate, toothed on one side. C. virginiana Mich.f. 



HAB. Woods. Can. to Flor. May. T? A small tree, with 

 the leaves alternate on short petioles and sharply serrate. Fer- 

 tile aments loose, with large foliaceous scales. Hornbeam. 



.8. OSTRYA. Mich. 



Monoecious. STERILE TL. Ament cylindrical ; scales 1- 

 flowered. Perianth none. Filaments branched. FERTILE 

 FL. Ament naked. Capsule inflated, imbricate, 1-seeded at 

 base. Monoecia. Polyandria. 



