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EXPLANATION OF THE PLATES. 243
PLATE THE SEVENTH.
Inflorescence.
Fig. 1 . Ammi majus. UmbeUiferce. Flowers in a compound
umbell.
a. Involucrum.
/'. Involucellum.
Fig. 2. Achillaea crithmifolia. Compositce. Calathides
disposed in a corymbus.
Fig. S. Heliotropium Indicum. Boraginecc. Spike cir-
cinate; flowers one-sided.
Fig. 4. Syringa vulgaris. Jaiminece. Flowers in a
thyrse.
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. RuMaceiC. Flowers
in a head.
Fig. 8. Sambulus humilis. Caprifoliacece. Flowers in
a cyme.
Fig. 9. Allium obliquum. Asphodelecc. Flowers in a
simple umbell or bouquet ; spathe two-valved ; scape three-
sided.
FiV. 10. Dianthus capitatus. Caryophyllem. Flowers in
a bundle.
Fig. II. Arum maculatum. Aroidece. Spadix separated
from the spathe.
a. Tip clubshaped. J
h. Ring of glands, about the middle, each terminated by
a filament. ^
c. Ring of ses^sile anthers, below the glands.
d^ Ring of sessile conglomerated ovaries, at the base.
Fig. 12. The flowers of the same, ni their spathe.
^1. The hoodlike spathe.
h. The lower bellying part of the spalhc.
c. The spadix.
R 2
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