Pod linear, flattened, usually opening elastically from the base; the valves nerveless and veinless, or nearly so; placentas and partition thick.
Ovary 1-celled, with 2 parietal placentas alternate with the stigmas.
Cleveland in Yorkshire, treatment of the placentas of mares at, i.
Yorkshire, custom as to the placentas of mares at Cleveland in, i.
If the ova are placed at some distance apart in the uterus, two placentas appear; if the ova are near each other the placentas may fuse, but their circulations do not.
The valves separate from their commissure, or central line of union, carrying the placentas with them, or they leave the latter in the centre, so as to form with the axis a column of a cylindrical, conical or prismatic shape.
Transverse section of the fruit of the Melon (Cucumis Melo), showing the placentas with the seeds attached to them.
The placentas either remain united to the axis, or they separate from it, being attached to the septa on the valves.
Transverse section of berry of Gooseberry, showing the seeds attached to the parietal placentas and immersed in pulp, which is formed partly from the endocarp, partly from the seed-coat.
Diagram to illustrate septifragal dehiscence, in which the dehiscence takes place through the back of the loculaments l, and the valves separate from the septa s, which are left attached to the placentas in the centre.
The carpellary leaves may fold inwards very slightly, or they may be applied in a valvate manner, merely touching at their margins, the placentas then being parietal (fig.
In these instances theplacentas may be formed at the margin of the united contiguous leaves, so as to appear single, or the margins may not be united, each developing a placenta.
In these cases the marginal placentasmeet in the axis, and unite so as to form a single central one (figs.
This is seen in cases where the margins of the carpel do not unite, but remain separate, and consequently two placentas are formed in place of one.
The placentas are parietal, and the ovules appear sessile on the walls of the ovary.
When the pistil consists of several separate carpels, or is apocarpous, there are generally separate placentas at each of their margins.
In many cases, however, the placentas are formations from the axis (axile), and are not connected with the carpellary leaves.
In this case the ovary is unilocular, and the placentas are parietal.
From the centre, processes go to circumference, ending in curved placentas bearing the ovules.
Cases occur, however, in which the placentas are not connected with the walls of the ovary, and form what is called a free central placenta (fig.
Diagrammatic section of a five-carpellary ovary, in which the edges of the carpels, bearing the placentas and ovules o, are not folded inwards.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "placentas" in a variety of sentences. We hope that you will now be able to make sentences using this word.
