DESCEIPTION OF THE PLATES. 267 



ovary^ much magnified. Fig. 8, a fruit in a very young undeveloped state witMn the calyx and 

 on the peduncle. Fig. 9, a transverse section of the same. Fig. 10, a ripe fruit of Thevetia Ahouai 

 supported by the calyx and pedicel. Fig. 11, the osseous endocarp of the same, with the short 

 apical longitudinal slit. Fig. 12, a side view of the same, showing the apical transverse open slit 

 continued along the marginal edges. Fig. 13, half the same, made by a knife passed through the long 

 slit and separating the two lamellar plates of the placenta, one of which is seen showing the bundle 

 of nourishing vessels rising from the base and divided into two branches, the vessels penetrating and 

 passing through the placenta to be lost in the seed of each cell. Fig. 14, the nut is divided by a 

 short transverse dissepiment, from the middle of which, to the right and left, branch off two placentas 

 nearly dividing it into two, a seed being peltately attached to each branch, thus making four pseudo- 

 cells, each one-seeded. Fig. 1 5, one of the fleshy seeds, showing the peltate hilum of attachment. 

 Fig. 16, the same, seen on its edge, showing the hilum. Fig. 17 shows the radiating bundles of 

 spiral vessels about the hilum. Fig. 18, the exalbuminous embryo, with thick fleshy cotyledons 

 and the oblique short superior radicle. Fig. 19, the same, shown on its edge : all natural size. 



B. Condylocarpum gracile, a, portion of a pendent branch, with its opposite axillary branching panicles. 

 Fig. 1, a flower. Fig. 2, the same expanded : both natural size. Fig. 3, a flower in bud, mag- 

 nified. Fig. 4, the corolla cut open, to show the peculiar form of the segments, their sinistrorse 

 convolution, and the position of the stamens near the base of the tube. Fig. 5, a segment of the 

 coroUa : more magnified. Fig. 6, a stamen, much magnified. Fig. 7, the calyx with the sepals 

 thrown back, showing its membranaceous margins dotted with many red spots, the two ovaries, very 

 short style, capitate hairy clavuncle, and stigmata. Fig. 8, one of the segments of the lomentaceous 

 follicles, which contains two superposed seeds. Fig. 9, another, which contains only a single seed. 

 Fig. 10, transverse section of one of these segments, showing the broad margins filled with pith, its 

 single cell divided nearly into two by a longitudinal septiform placenta, with a nucleus attached to 

 its margin by a central hilum and coiled round it : all natural size. Fig. 11, a seed with its 

 margins coiled inwards to embrace the placenta, showing the hilar point of its attachment. Fig. 12, 

 the same with its margins flattened out. Fig. 13, the heterotropous embryo imbedded in thin 

 albumen, showing the thin foliaceous oblong cotyledons, and the superior thin terete radicle, of 

 one third their length :' all somewhat magnified. 



Plate V. 



A. Manothrias valida, a portion of the plant in fruit. Fig. 1, the 2 -celled capsule dehiscing along 



the dissepiment, each half splitting along the line of the axis at the suture, whose margins are 

 inflexed and combined into a narrow cylindrical placenta bearing many hairy seeds. Fig. 2, a trans- 

 verse section of the capsule, showing the divisible dissepiment, the inflexed margins of the semi- 

 niferous placentas. Fig. 3, a seed : all natural size. Fig. 4, a seed, seen on its dorsal side, where 

 it is pilose above the middle with long soft hairs. Fig. 5, the same, showing its ventral face, 

 marked by a central hilum, by which it is peltately affixed to the placenta. Fig. 6, the copious 

 albumen extracted. Fig. 7, the heterotropous embryo : all much magnified. Fig. 8, portion of one 

 of the remarkable hairs, seen under a microscope of great power, and marked by a dark capillary axis 

 with many alternate horizontal lines, the intervening spaces ornamented by close spiral lines. 



B. Manothrix nodosa, portion of a plant, showing its opposite leaves and nodose joints at the remote 



axils and its short axillary raceme. Fig. 1, a flower, natural size. Fig. 2, the corolla cut open, 

 to show the dextrorse convolution and the position of the stamens, a little magnified. Fig. 3, the 

 same, showing the tube of the corolla pubescent inside, more magnified. Fig. 4, stamens, shown in 

 different positions, still more magnified. Mg. 5, the calyx, pedicel, and long slender style, the 

 clavuncle and short terminal stigmata, much magnified. 



2m 2 



