Stem

“ As the roots are feeding and storing places, so the stem is a sort of passage way for the passing back and forth of liquids. Take a stem of a big plant, like an oak tree, and you see in the wood where storage of fibre has gone on. ”

“ Contrast between Stem and Root. Stems are ascending axes; roots are descending axes. Stems grow by the successive development of internodes (13) , one after another, each leaf-bearing at its summit (or node) ; so that it is of the essential nature of a stem to bear leaves. Roots bear no leaves, are not distinguishable into nodes and internodes, but grow on continuously from the lower end. They commonly branch freely, but not from any fixed points nor in definite order.
69. Although roots generally do not give rise to stems, and therefore do not propagate the plant, exceptions are not uncommon. ”

“ When a stem, like that of the morning-glory, sweeps slowly and carefully through the air in search of something to lay hold of in its efforts to climb upward, and when, on finding this support, it makes such good use of it, we feel inclined to say, “Well done, little stem.” ”

“ A creeping stem.—Examine a plant of the ground ivy. Is the stem strong enough to stand upright? How does it spread out its leaves to the light and air? The stem grows along the ground, and at intervals it gives off a pair of leaves which grow upwards, and a tuft of roots which grow down to the ground.
2. A runner.—Is the “runner” of the strawberry of the same nature, i.e. is it a continuous stem like that of the ground ivy? When the plant is carefully examined, the creeping “stem” is seen to be a branch arising in the axil of a leaf. ”

“ To the plant the stem is of use, as it holds the leaves, and flowers, and fruit, up into the air and sun. Also the stem is made up of the tubes or pipes which carry the sap, and the food it holds, through all the plant.
Plant stems are very useful to men. The stems of trees give us wood for fuel, and to build ships and houses, and to make furniture. Some stems are also good for food. ”

“ The Stem is the axis of the plant, the part which bears all the other organs. Branches are secondary stems, that is, stems growing out of stems. The stem at the very beginning produces roots, in most plants a single root from the base of the embryo-stem, or caulicle. As this root becomes a descending axis, so the stem, which grows in the opposite direction is called the ascending axis. Rising out of the soil, the stem bears leaves; and leaf-bearing is the particular characteristic of the stem. But there are forms of stems that remain underground, or make a part of their growth there. ”

“ The seedlings, five or six years old, are very striking objects to one from the North, consisting, as they do, of the straight, leafless stem, surmounted by a crown of deep green leaves, arching and spreading like a palm. ”

“ The roughness and ruggedness of its leaves, the sharp-angled stem strongly set, make a foil that a sculptor cannot improve. Then wonder how this marvellous thing was born out of your garden soil through the medium of one small strand of a succulent stem. ”

“ Stems are of Many Forms.—The general way in which a plant grows is called its habit. The habit is the appearance or general form. Its habit may be open or loose, dense, straight, crooked, compact, straggling, climbing, erect, weak, strong, and the like. The roots and the leaves are the important functional or working parts; the stem merely connects them, and its form is exceedingly variable. ”

“ As explained in the section on Inflorescence, flowers arise from the same places as branches, and from no other; flower-buds, like leaf-buds, appear either on the summit of a stem, that is, as a terminal bud, or in the axil of a leaf, as an axillary bud. And, as the plan of a symmetrical flower shows, the arrangement of the parts on their axis or receptacle is that of leaves upon the stem.
245. That the sepals and petals are of the nature of leaves is evident from their appearance; they are commonly called the leaves of the flower. ”

“ And when a stem on land knows how to keep off meddlers, yet has the wisdom not to take unnecessary trouble when afloat, like that of the amphibious knotweed, then we feel that a plant gives its stem, as well as its other parts, a large supply of common sense. ”

“ Stem about two feet in height, generally erect, but, as the seeds approach maturity, often acquiring a drooping habit; stem-leaves more finely cut or divided than those proceeding directly from the root, and all possessed of a strong and somewhat disagreeable odor. ”

“ The short stem which in all the years has not attained a height of two feet now suddenly shoots up to thirty feet, its outstanding branches in symmetrical order enhancing its dignity and beauty beyond that of most other plants. ”

“ Plants in their perfect form consist of four principal parts,—the Root, Stem, Leaf, and Flower. It is true that the stem and flower are parts, or remnants, or altered states, of the leaves; and that, speaking with close accuracy, we might say, a perfect plant consists of leaf and root. ”

“ The fact of outstanding importance to everyone who really looks at most plants is that part of them are above ground and part below. This simple observation carries with it the recognition of a fundamental difference of plant structure, namely roots and stem. Most plants bear obvious leaves, and at some time in their life flowers, inevitably followed by fruits and seeds. The ideally perfect plant would consist, then, of root, stem, leaves, flowers, fruit, and seed. ”

“ Forms of Stems.—Stems may grow in many ways. Let the pupils compare the habits of growth of the seedlings they have studied. The Sunflower and Corn are erect. This is the most usual habit, as with our common trees. The Morning Glory is twining, the stem itself twists about a support. The Bean, Pea and Nasturtium are climbing. The stems are weak, and are held up, in the first two by tendrils, in the last by the twining leaf-stalks. ”

“ It is, doubtless, as good a way, perhaps the best, to begin with a single plant, and study root, stem, leaves, and flowers as belonging to a whole, but the problem is complicated by practical difficulties. ”

“ Who can account for, or comprehend, the structure of a single tree or plant? The roots, the stem, the woody fibres, the bark, the rind, the air-vessels, the sap-vessels, the leaves, the flowers, and the fruits, are so many mysteries. ”

“ The foundation of a new plant consists equally of a stem and leaves, and the sole distinction is that the stem becomes intimately blended at its base with the mother plant in its growth, and has no free radical extremity like that exhibited by a plant developed from a seed. ”

“ Thus the Body of this Tree seems to be made up of many thick Skins, growing one over another, and when it is full grown, there springs out of the top a strong Stem, harder in substance than any other part of the Body. This Stem shoots forth at the Heart of the Tree, is as big as a Man’s Arm, and as long; and the Fruit grows in clusters round it, first blossoming, and then shooting forth the Fruit. ”

“ By insensible steps the plant builds itself up into a large and various fabric of root, stem, leaves, flowers, and fruit, every one molded, within and without, in accordance with an extremely complex, but at the same time minutely defined, pattern. ”

“ Very well! Since the stem does not naturally curve the way we want it, we will make it do so. All we have to do is to draw it through our fingers several times and, by pressure, gently persuade it to turn as we wish.
Fig. 84 is the under-side of the small leaf at the bottom of the design (Fig. 82) , and shows how the stem loop above the leaf was made. ”

“ The trunk has been therefore called by some botanists a “bundle of roots,” but I think inaccurately. It is rather a messenger to the roots.3 A root, properly so called, is a fibre, spongy or absorbent at the extremity, which secretes certain elements from the earth. The stem is by this definition no more a cluster of roots than a cluster of leaves, but a channel of intercourse between the roots and the leaves. It can gather no nourishment. ”

“ The stem, which runs up and over trees, resembles that of other climbing plants, is extremely elastic, and as tough as a cord. The leaves, of which you see the form and colour, are also tough and thick. ”

“ The tip of a stem or branch is occupied by a bud. As the tip elongates (Fig. 40) , the outer leaves of the bud become separated by internodes, and new leaves continually arise around the growing point.
The path of the water in the stem.—It may easily be shown that water travels up the stem to the leaves. It is common knowledge that [Pg 70] slightly withered leaves or flowers become fresh and crisp again if the twig or stalk is put in water. ”

“ Even a very slender stem can convey a vast amount of water and food to a plant which is transpiring or growing actively, as we can test roughly by weighing a pot shrub as it begins to come into leaf, and again a week later, or comparing the growth of a pea with the size of its stem at the base. ”

“ The sensitive plant has indigestible seeds—so they say—and it will flourish for ever. I give my advice thus to a young plant—have a strong root, a weak stem, and an indigestible seed; so you will outlast the eternal city, and your progeny will clothe mountains, and the irascible planter will blaspheme in vain. The weak point of tuitui is that its stem is strong. ”

“ The curious aerial roots which descend from the branches gradually creep down, and it is the layers upon layers of these that strengthen the [90] original stem sufficiently to enable it to bear the immense weight of its tufted crown, as decay seems always to set in in the heart of the stem, and by the time the trees attain to a venerable age they are invariably hollow. ”

“ Only, because the character of the stem depends on the nature of the leaf and flower, we must put it last in order of examination; and trace the development of the plant first in root and leaf; then in the flower and its fruit; and lastly in the stem.
2. First, then, the Root.
Every plant is divided, as I just said, in the main, into two parts, and these have opposite natures. One part seeks the light; the other hates it. One part feeds on the air; the other on the dust.
The part that loves the light is called the Leaf. It is an old Saxon word ”

“ Hence the entire fitness of the word for our present purposes; as signifying, "a spiral shoot extending itself by branches." But since, unless it is spiral, it is not a stem, and unless it has branches, it is not a stem, we shall still want another word for the sustaining 'sceptre' of a foxglove, or cowslip. Before determining that, however, we must see what need there may be of one familiar to our ears until lately, although now, I understand, falling into disuse.
15. By our definition, a stem is a spirally bent, essentially living and growing, shoot of vegetation. ”

“ Sometimes they grow on a little stem of their own, called a scape, that springs up separately from the root. But usually the main stem or one of the branches is changed into a flower-stem. Now suppose we cut this rose-bud in two, and then I can show you. ”

“ The root presents nothing of the kind. This character permits us always to distinguish, in the vegetable axis, what belongs really to the stem, and what to the root."
4. Yes; and that is partly a new idea to me, for in this power of assigning their order for the leaves, the stem seems to take a royal or commandant character, and cannot be merely defined as the connexion of the leaf with the roots.
In it is put the spirit of determination. One cannot fancy the little leaf, as it is born, determining the point it will be born at: the governing stem must determine that for it. ”

“ In general, we do not see much of the stem because it is largely hidden by the covering of leaves, so that if you want to study stems you should go to the woods in the winter when there are no leaves on the trees, and you can see the form of the branches themselves. ”

“ By confining it to a single stem and using it in a young state, you get the fullest size and grace of which the leaves are capable. Allow it to become old and branched, and it may be useful, but by no means so much so as when young and without side branches. It may be raised from seed as easily as a common bedding plant. ”

“ Then the plant has no stem, or an underground one. But if the three leaves rise above the ground, as in Fig. 17, they must reach their roots by elongating their stalks, and this elongation is the stem of the plant. If the outside leaves grow last, and are therefore youngest, the plant is said to grow from the outside. You know that 'ex' means out, and that 'gen' is the first syllable of Genesis (or creation) , therefore the old botanists, putting an o between the two syllables, called plants whose outside leaves grew last, Ex-o-gens. ”

“ Stems or branches which remain under ground give out roots as freely as roots themselves give off branches. Stems which creep on the ground most commonly root at the joints; so will most branches when bent to the ground, as in propagation by layering; and propagation by cuttings equally depends upon the tendency of the cut end of a shoot to produce roots. Thus, a piece of a plant which has stem and leaves, either developed or in the bud, may be made to produce roots, and so become an independent plant. ”

“ We know that a tree which, standing alone in an exposed position, has a short and thick stem, has a tall and slender stem when it grows in a wood; and that also its branches then take a different inclination. ”

“ But for our purposes it is better that it should not be perfectly hardy, as by confining it to a single young stem and using young plants, or plants that have been cut down every year, we shall get an erect stem covered with leaves more graceful than a fern, and that is the kind of ornament we want as a graceful object amidst low-growing flowers. ”