DESCRIPTION OF THE PLATES. 
covered by the inner integument (tegmen) ; the chalaza is seen at its lower extremity ; 
on its summit is observed a free thread, which appears like a suspensor, and which corre- 
sponds in position with the hilum of the testa. Fig. 24, the same, seen from below, showing 
the chalaza. Fig. 25, longitudinal section of the albumen in the same, with the enclosed 
embryo, seen on its edge. Fig. 26, the embryo extracted, seen on its face : all magnified. 
B. Details of Ptebosttbax coetmbosum. 
Fig. 1, a flower. Fig. 2, the five free petals. Fig. 3, the ten stamens. Fig. 4, the 
pistil enclosed in the calyx : all nat. size. Fig. 5, four of the petals. Fig. 6, five of the 
stamens, whose construction is similar to that described in Halesia. Fig. 7, the pistil 
enclosed in the calyx, the upper half of the ovary being free ; the lower half is adnate to 
the tube of the calyx : all magnified equally. Fig. 8, the stigma, more magnified. Fig. 9, 
a longitudinal section of the ovary as seen in fig. 7 : its internal structure is exactly 
similar to that described in Halesia. Fig. 10, the same, with the ovules removed, to show 
the central placenta and incomplete dissepiments. Fig. 11, a transverse section of the 
same across the placenta. Fig. 12, a transverse section of the same across the upper or 
unilocular portion of the ovary, just above the line of the placenta, with the carinated 
nervures of the adnate tube of the calyx, which afterwards grow into wings upon the seed. 
Fig. 13, a transverse section of the upper free portion of the ovule below the style, with 
the extremities of the ovules shown in their position : all magnified. Fig. 14, a four- 
winged seed. Fig. 15, a longitudinal section of the nut: both nat. size. Fig. 16, trans- 
verse section of a fruit, showing an internal structure similar to that described in Halesia : 
magnified. 
Plate 32. — Diclidantheba elliptica. 
Fig. 1, a flower in bud, showing its twisted aestivation. Fig. 2, the same expanded. 
Fig. 3, a coroUa cut open. Fig. 4, the pistil, seated in the calyx, half of which is cut 
away : all nat. size. Fig. 5, a corolla cut open, magnified : here the petals above the line 
of the anthers are quite free ; but below this they are pseudo-gamopetalous by the 
adhesion of the very thin membranaceous monadelphous tube of the stamens ; when this 
tube is torn away, the petals become free to the base, there being no mutual agglutination 
of their margins, which are contorsively imbricated and overlap each other : the dextral or 
exterior margin, not being in contact with the stamiaal tube, is always free ; it is there- 
fore incorrect to say that the corolla is gamopetalous. Fig. 6, the pistil, with the ovary 
supported on a stipitate base within the free calyx : both magnified. Fig. 7, upper portion 
of the very thin monadelphous tube of the stamens, separated from its adhesion to the 
petals, showing the summits of the united filaments to be free, each bearing an erect two- 
celled anther, which bursts by a transverse apical furrow into two somewhat unequal 
valves ; in its dehiscence, the posterior valve remains erect, and the anterior valve becomes 
quite reflected ; the filamentous tube is pubescent within : more magnified. Fig. 8, a grain 
of pollen, highly magnified. Fig. 9, a longitudinal section of the stipitate ovary, showing 
two of its cells, each cell bearing, on the summit of the axile column, an anatropous ovule, 
with a ventral raphe. Fig. 10, a transverse section of the same, showing its five complete 
cells, each bearing a suspended ovule : both magnified. Fig. 11, an ovule with its ventral 
raphe, more magnified. 
B. Details of Diclidantheba laubieolia. 
Fig. 12, a mature fruit. Fig. 13, a transverse section of the same, containing a single 
suspended seed filling one of its cells, the other four cells being sterile. Fig. 14, the seed 
