ORDER CXV. AMENTACE^E. 507 



Genus II.— POP'ULUS. Tourn. 20—8. 

 (Origin of the name uncertain.) 



Dioecious. Ament cylindrical. Scales lacerated. Sterile 

 florets; anthers 8 — 30, arising from a turbinate, oblique, entire, 

 single perianth. Fertile florets ; perianth entire. Stigmas 4. 

 Capsule superior, 2-celled, 2-valved, many-seeded. Seeds comose. 



1. P. grandidenta'ta, (Mich.) A large tree, with a smooth greenish 

 bark. Leaven alternate, nearly round, unequally and sinuately toothed, 

 glabrous, villous when young, petioles compressed near the summit. 

 Flowers in small axillary, cylindrical aments. — *> . March. Mountains. 



Cotton-tree or American Aspen. 



2. P. angula'ta, (Ait.) A large tree, with the branches winged. 

 Leaves ovate, deltoid, acuminate, serrate, glabrous, with the serratures 

 uncinate. Flowers small. — ^. March. On the margins of rivers. 60 

 — 80 feet. Carolina Poplar. 



3. P. heterophyl'la, (L.) A large tree, branches terete. Leaves 

 roundish, ovate, obtuse, uncinately toothed, the sinus small, cordate, 

 and somewhat auricled, when young tomentose. — ^ . May. Swamps. 

 Middle and upper districts. 60 — 80 feet. 



Sub-order II.— MYRICA'CEJE. {Gale Tribe) 



Fruit usually drupaceous. Flowers naked. Stamens 2 — 8. 

 Ovary 1 -eel led. 



Genus III.— MYPJ'CA. L. 20—4. 



(From the Greek murio, to flow ; found on the banks of streams.) 



Dioecious. Ament ovate-oblong. Scales crescent-shaped. 

 Sterile florets ; stamens 4 — 6 ; anthers 4-valved. Fertile flo- 

 rets ; ovary 1. Stigmas 2. Drupe 1-celled, 1-seeded. 



1. M. CEraF'ERA, (L.) A small shrub, diffusely branched. Leaves pe- 

 rennial, alternate, somewhat coriaceous, linear-lanceolate, glabroue, dot- 

 ted, slightly pubescent when young. Flowers in short, cylindrical, ax- 

 illary aments. Stamens 4. Scales nearly round. — ^ . March — April. 

 In damp soils. Bayberry or Wax-myrtle. 



2. M. Carolinen'sis, (L.) A small shrub. Leaves cuneate, oblong, 

 coarsely toothed. Scales acute. Fruit globular, large. — ^ . March — 

 April. Wet places. 3 — 4 feet. 



Genus IV.— COMPTO'NIA. Banks, 19—3. 

 (In honor of Henry Compton, Bishop of London.) 



Monoecious. Sterile florets ; ament cylindrical. Scales 1- 



flowered. Perianth 2-parted. Stamens 3-forked. Anthers 6. 



Fertile floret; ament globose; scale 1-flowered. Styles 2. 

 Nut ovate. 



1. C. asplenifo'lia, (Ait.) A small shrub. Leaves long, linear-lance 

 olate, alternate, irregularly pinnatifid. Flowers in oval, sessile aments. 



