Seed filling the cavity of the stone; cotyledons flat, much longer than the short superior radicle turned toward the hilum.
The cotyledons which are formed beneath the closed seed-sheath are charged, so to speak, with only a crude sap; they are scarcely and but rudely organized and quite undeveloped.
In germination the cotyledons come above ground and form the first green leaves of the plant.
The seeds are filled with the large embryo, the two cotyledons of which are variously folded.
Conduplicate, [Illustration] applied to cotyledons that are incumbent and so folded as to embrace the radicle (Mustard).
The cotyledons are often two in number, but sometimes (e.
The bundles from the cotyledons pursue a direct course to the stele of the main axis, and do not assume the girdle-form characteristic of the adult plant.
With peas it is impossible to get a satisfactory crop if the seed is below the cork, as the plant is very prone to bacterial and fungal infection in its early stages, and damp cotyledons are fatal for this reason.
Consequently the mouths of the bottles are covered with stout cartridge paper, the pea root being inserted through a hole in the paper, so that the root is in the liquid while the cotyledons rest on the surface.
There seems however to be a reservoir of nutriment prepared for some seeds besides their cotyledons or seed-leaves, which may be supposed in some measure analogous to the yolk of the egg.
And though on the separation of the cotyledons of ruminating animals no blood is effused, yet this is owing clearly to the greater power of contraction of their uterine lacunæ or alveoli.
Still later the cotyledons (seed leaves) start development from the apical meristem and their growth in length is rapid, but they are very thin and follow the contours of the seed coat.
In such case, the lobes of the cotyledons may not attain the full length of the seed coat, or pellicle, which surrounds them.
After the cotyledons have attained full length, growth in thickness begins in the area nearest the epicotyl and proceeds toward the margins.
Growth in length of the cotyledons may be arrested by unfavorable nutritional conditions during the time of elongation.
Apart from this difference cotyledons are much alike.
The upper half of the embryo in Pinus is a cylindrical fascicle of 4 to 15 cotyledons (fig.
Sections from fascicles of 10 and of 5 cotyledons are shown in figs.
As growth continues, we notice that the cotyledons become smaller and smaller, until their food contents are completely absorbed into the young plant.
That part of the plant above the cotyledonsis known as the plumule or epicotyl (meaning above the cotyledons).
If you pull apart the cotyledonsvery carefully, you find certain other structures between them.
We find that the one cotyledon of the corn grain does not serve the same purpose to the young plant as do the two cotyledons of the bean.
From between the cotyledons the budlike plumule or epicotyl grows upward, forming the first true leaves and all of the stem above the cotyledons.
On the 15th the first leaf was formed, and at night the cotyledons were vertical.
The cotyledons of Oxalis Valdiviana and rosea were rubbed and did not exhibit any sensitiveness.
In the next trial much younger cotyledons were similarly treated, but were exposed to a rather obscure lateral light.
The angles above the horizon at which the cotyledons of another seedling stood at different hours is recorded in the following short table: -- Oct.
Secondly, the hypocotyls of the seeds which were pinned to the lids of the jars gradually became arched; and, as the cotyledons were fixed, the movement of the hypocotyl affected the position of the radicle, and caused confusion.
Leaves and cotyledons assume their nocturnal position by two means, by the aid of pulvini and without such aid.
Therefore the cotyledons of this plant (kept in the greenhouse) go to sleep for even a shorter time than those of the cabbage.
Whenever the pots were looked at, this was done as quickly as possible, and the cotyledons were then held transversely with respect to the light, so that their curvature could not have been thus increased or diminished.
The cotyledons rise so much at night as to come nearly in contact.
Where thecotyledons are broken off, the so-called crown of the walnut, two rough places appear, nearly opposite on the stem.
Thus, the plants which produce seeds with two cotyledons may be known by the nature of the stem, which consists of a central pith, surrounded by wood arranged in one or more rings, and the whole enclosed in an outer epidermis or in a bark.
E, the embryo, with one of the cotyledons removed, × 2.
The second sub-class of the angiosperms, the dicotyledons, receive their name from the two opposite seed leaves orcotyledons with which the young plant is furnished.
But what is most interesting is that the pod is here, the cotyledons shooting out of it.
While in the third group the cotyledons are folded in the middle, like the leaves of a book (Pl.
Thus, in one group, which may be represented by the wall-flower, the cotyledons are flat or plane (Pl.
Hence the spores of ferns differ strikingly from the seeds of the higher plants in not containing the embryo radicle and cotyledons already formed, these being produced during or after germination; also in the fertilizing organs, viz.
The albumen and cotyledons serve to supply the embryo with nutriment until the roots have grown sufficiently to enable them to absorb it from the soil; the cotyledons also serve as temporary leaves.
It will be very difficult to make them understand that cotyledons are the first seed-leaves, and they will feel as if it were a forced connection, and one that they cannot see for themselves.
These last can be again divided into those in which the cotyledons come up into the air and those where they remain in the ground.
In the latter the cotyledons are so heavily gorged with nourishment that they never become of any use as leaves.
If they are adapted for younger ones, it is especially important to begin with a seed where the leaf-like character of the cotyledons is evident, or becomes so.
The cotyledons in the first make apparently an unsuccessful effort to become leaves, which the second give up altogether.
After roasting, the shell is brittle and quite free from the cotyledonsor kernel.
In dry seasons the crop is often destroyed by the ravages of a small beetle, which perforates the cotyledons of the plants, and destroys the crop on whole fields in a few hours.
Having the cotyledons of a dicotyledonous embryo confluent, and forming a large mass compared with the rest of the body.
Leaning or resting; -- said of anthers when lying on the inner side of the filament, or of cotyledons when the radicle lies against the back of one of them.
It consists of a short, woody, topshaped stem, and never more than two leaves, which are the cotyledons enormously developed, and at length split into diverging segments.
The rudimentary stem of a plant which supports the cotyledons in the seed, and from which the root is developed downward; the stem of the embryo; the caulicle.
Closely united by the coalescence, or sticking together, of contiguous faces, as in the case of the cotyledons of the live-oak acorn.
A plant Whose radicle is not inclosed or sheathed by the cotyledons or plumule.
A plant that has many, or more than two, cotyledons in the seed.
The leaves are commonly netted-veined, and the number ofcotyledons is two, or, very rarely, several in a whorl.
Having a radicle which is not inclosed by the cotyledons or plumule; of or relating to an exorhiza.
The seeds of the papilionaceous plants which have thin cotyledons are not eatable; but those with fleshy cotyledons may be safely used as food.
The embryo fills the whole seed; and the cotyledons are fleshy, two-lobed, and wrinkled.
The cotyledons of the plants belonging to this tribe are generally leafy; and the seeds are not eatable.
When put into the ground, the cotyledons do not appear in the shape of seed-leaves, but remain in the ground, and the plumule and radicle are protruded as shown in fig.
A line joining the two cotyledons stood facing a north-east window, and the day was uniformly cloudy.
Why I want to know is as follows: The cotyledons of Cassia go to sleep, and are sensitive to a touch; but what has surprised me much is that they are in constant movement up and down.
Perhaps you may like to see a rough copy of the tracing of movements of one of the cotyledons of red cabbage, and you can throw it into the fire.
Might not the inequality of the cotyledons of Citrus and of Pachira be attributed to the pressure, which the several embryos enclosed in the same seed exert upon each other?
With Coffea arabica also seeds including two embryos are not very rare; but I have not yet observed whether in this case the cotyledons be inequal.
So it is with the cotyledons of the cabbage, and therefore I am very curious to ascertain how far this is general.
He knew, for instance, that all animals without front teeth in the upper jaw have cotyledons, while most that have front teeth on both jaws and no horns have no cotyledons (De Gen.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "cotyledons" in a variety of sentences. We hope that you will now be able to make sentences using this word.
