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EXPLANATION OP THE PLATES. 255
Fig. 9. Amaranthus hjpochondriacus; Aniaranthidece.
Pyxidium uncovered, and magnified, membranaceous.
-Fig". 10. Valves of the same, separated.
Fig. 1 1 . Kernel of the same magnified ; perisperm central;
embryo peripherical, annular ; cotyledons semicylindrical,
incumbent; radicle threadlike, below.
Fig. ] 2. Salsola decumbens. Chenopodece. Periphyllum
magnified, containing the utriculus.
Fig. 13. Perigonium of the same cut vertically, and
magnified, to show the seed.
Fig. 14. Embryo of the same, highly magnified ; threadlike,
rolled in a ball, cotyledons very long, linear; radicle
nearly cylindrical, placed horizontally in the uppermost part
of the seed.
'
Fig. 15. Carex vulpina. Cyperacece. Persistent spathel-
lules cut longitudinally and magnified; akenium pedicelled,
enclosed in the spathellules.
Fig. 16. Akenium of the same cut longitudinally and
magnified; style persistent; embryo at the base of the
seed.
Fig. 17. Gomphrena globosa. Amaranthidea. Pyxidium
cut longitudinally and magnified; style persistent; seed
single, inverted, hanging by the umbilical cord, proceeding
from the bottom of the pyxidium.
Fig. 18. Beta vulgaris. Chenopodece. Utriculus enclosed
within the fleshy perigonium, and magnified.
Fig. 19. The utriculus of the same cut transversely and
magnified; embryo annular.
Fig. 20. Thesium alpinum. Santalacece. Pericarpium
magnified; crowned by the persistent perigonium.
Fig. 21. The same cut transversely.
Fig. 22. The seed of the same cut longitudinally and
magnified ; embryo straight, central.
Fig. 23. Embryo of the same, highly magnified.
Fig. 24. Fraxinus excelsior. Fraxinece. Samara opened
before it is ripe ; two-celled ; ovules four, hanging two side
by side in each cell.
Fig. ^25. The ripe samara of the same; opened; having
only one seed, pendulous; the others having perished.
Fig. 26. Ulmus Americana. Ulmacece. Samara with the
cell opened; seed pendent.