206 MONOECIA. TETRANDRIA. 



clusively indig-enous to India and the tropical regions of 

 America. 



:15. COMPTONIA. Gctrtner. (Swcct-Fern.) 



Masc. Anient cylindric, scales 1 -llowprcd; co- 

 rolla none. Stamina 5 or 4, filaments simple, 

 Fem. Ament ovate. Calix at length 6-Ieave(l. 

 Corollanone. Styles Q. J\^/^i oval, 1 -relied. 



A low and odorous blirub nearl_v allied to ^lynca Gale; 

 leaves oblong and sinuated, resembling tlie partial fronds 

 of a fern. 



Species. C. asplenifolia. — The only one of the genus. 



7S6. TRAGIA. Z. 



Masc. Calix 3-partcd. Corolla none. Fem, 

 Calix o-pai'ted. Corolla none. Style trifid. Cap- 

 sule tricoccous, S-celled. Seed solitary. 



Stems shrub!)y or lierbaceous, scandent or erect; leaves 

 alternate, stipulate; flowers bracteate, axillary and spiked; 

 female flowers at llie base of the same spike, or in the 

 same axill and distinct. 



Species. 1. '1 . iirens. 2. urticifolia. 3. macrocarpa. 



A tropical genus principally indigenous to India and the 

 warmer parts of America. 



Oruer IV.— TETRANDRIA. 



737. ALNUS. WilUl (Alder.) 



Masc. Anient composed of 3 flowered, cm- 

 neform truncated receptacles. Calix the scaFes 

 of the ament. Corolla 4-parted. Fem. Calix 

 scales 2 -flowered. Corolla none. Seeds com- 

 pressed, ovate, apterous. 



Trees or shrubs, with alternate entire and stipulate 

 leaves; amenta axillary. 



Species. 1. A. gintinQsa. In Canada, Ph. 2. cnspa. 3. 

 set^rtdata—Oi^ tiiis genus there are 2 oth^^r species indi- 

 genous to Europe. 



