DESCRIPTION OF THE PLATES. 
same, ruptured by age. Fig. 4, a male spikelet : all nat. size. Fig. 5, the same, magni- 
fied. Fig. 6, a perigonium surrounding the antheriferous column, seen in front. Fig. 7, 
the same, seen sideways : all magnified. Fig. 8, a female spikelet, nai. size. Fig. 9, the 
same, magnified. Fig. 10, a pair of involucels. Fig. 11, two apical fruits, seen in front. 
Fig. 12, the same, seen sideways : all magnified. Fig. 13, a firait, more magnified. 
Plate 76. — Ephedra. 
A. Portions of male and female plants of Ephedra monticola. 
B. Part of a male plant of Ephedra Andina. 
Fig. 1, a pair of connate leaflets. Fig. 2, the same, raptured hy age: tmt. size. 
Fig. 3, a flower enclosed in its involucel, seen in front. Fig. 4, a pair of opposite flowers 
enclosed in their connate involucels, seen sideways. Fig. 5, a perigonium, enclosing its 
antheriferous column, seen in front. Fig. 6, the same, seen sideways : all magnified. 
Fig. 7, an anther, showing its two apical pores. Fig. 8, a transverse section of the same, 
to show its two cells: hoih more magnified. Fig. 9, a grain of pollen, seen sideways. 
Fig. 10, the same, seen from above : both highly magnified. 
Plate 77. — Ephedra. 
A. Portion of a female plant of Ephedra dumosa. 
Fig. 1, a pair of connate leaflets, magnified. Fig. 2, a terminal pair of achenia, one of 
them with its exserted tuhillus. Fig. 3, an achenium seen sideways, showing the open 
pore at its summit. Fig. 4, a longitudinal section of the pericarp of the same, showing the 
enclosed seed with its tuhillus passing through the apical pore. Fig. 5, a longitudinal 
section of the same, showing the albumen enclosed within the two integuments, which 
are agglutinated helow, free above, and united again in the summit upon a red fleshy 
gland that supports the tuhillus, which is a tubular extension of the outer coating. 
Fig. 6, the albumen. Fig. 7, a longitudinal section of the same, enclosing the embryo, as 
seen on its face. Fig. 8, the same, with the enclosed emhryo seen on its edge, and show- 
ing the expansibility of the cellular apex of the albumen : all equally magnified. Fig. 9, 
the reticulated texture of the involucels, enclosing a stratum of elongated spicular fibres, 
highly magnified. 
B. Portion of a male plant of Ephedra ochreata. 
Fig. 1, three temate leaflets, united into a vaginant tube. Fig. 2, the same, splitting 
by age, nat. size. Fig. 3, a trilobed involucel. Fig. 4, the same, seen from above, con- 
taining its three verticillate flowers. Fig. 5, a perigonium. Fig. 6, the same, enclosing 
its antheriferous column : all magnified. 
Plate 78. — Ephedra. 
A. Portions of male and female plants of Ephedra Americana. 
Fig. 1, a pair of leaflets. Fig. 2, the same, split open by age. Fig. 3, a male spikelet : 
all nat. size. Fig. 4, the same, magnified. Fig. 5, a perigonium enclosing its antheriferous 
