EXPLANATION OF THE PLATES. 
243 
PLATE THE SEVENTH. 
Inflorescence . 
Fig. 1. Arnmi majus. UmbeUiferce. Flowers in a com- 
pound umbell. 
a. Involucrum. 
h. Involucellum. 
Fig. 2. Achilkea crithmifolia. Composites. Calathides 
disposed in a corymbus. 
Fig. 3. Heliotropium Indicum. Boraginece. Spike cir- 
cinate; flowers one-sided. 
Fig. 4. Syringa vulgaris. Jasmmece . Flowers in a 
diyrse. 
Fig. 5. Populus tremula. Salicinece . Flowers of the 
female plant in a catkin. 
Fig. 6. A detached flower of the same, to show the 
palmated, fringed bractea upon which it is supported. 
Fig. 7. Cephalanthus occidentalis. Rubiacece. Flowers 
m a head. 
Fig, 8. Sambulus humilis. Caprifoiiaceee. Flowers in 
■a cyme. 
Fig. 9. Allium obliquum. Aspliodelece. Flowers in a 
simple umbell or bouquet; spathe two-valved; scape three- 
sided. 
Fig. 10. Dianthus capitatus. CaryopkyllefE. Flowers in 
a bundle. 
Fig. 11. Arum maeulatum. Aroidece. Spadix separated 
from the spathe. 
a. Tip clubshaped. 
b. Ring of glands, about the middle, each terminated by 
z filament. 
c. Ring of sessile anthers, below the glands. 
d . Ring of sessile conglomerated ovaries, at the base* 
Fig. 12. The flowers of the same, in their spathe. 
a. The hoodlike spathe. 
b. The lower bellying part of the spathe. 
g. The spadix. 
