XII. IVY IN THE COPSE.

See what a beautiful creeping spray of ivy—dark green, with russet veins—from the ground beneath the copse here! How close it keeps to the earth! how exquisitely the leaves fit in with one another, like a living mosaic! That is why the ivy-leaf is shaped as we know it, with re-entrant angles, very abrupt and deep-lobed. The plant, as a whole, crawls snake-like over the ground in shady spots, or climbs up the face of stony cliffs, or mantles walls and ruins, or clambers boldly over the trunks of trees—which last, though its most conspicuous, is not by any means its commonest or most natural situation. It is a haunter of the shade; therefore it wants to utilize to the uttermost every inch of space and every ray of sunlight. So it clings close to the soil or to its upright support, and lays its leaves out flat, each occupying its own chosen spot of earth without encroaching on its neighbour’s demesne, and none ever standing in the light of another. That shows one at once the secret reason for the angular foliage: it is exactly adapted to the ivy’s habitat. All plants which grow in the same way, half trailing, half climbing, have leaves of similar shape. Three well-known examples, each bearing witness to the resemblance in their very names, are the ivy-leaved veronica, the ivy-leaved campanula, and the ivy-leaved toad-flax. Or look once more at the pretty climbing ivy-leaved geranium or pelargonium, so commonly grown in windows. Contrast all these angular leaves of prostrate creepers with the heart-shaped or arrow-headed foliage of the upright twining or tendril-making climbers, such as convolvulus, black bindweed, black bryony, and bittersweet, and you will recognize at once how different modes of life almost necessarily beget different types of leaf-arrangement.

Nay, more. If you watch the ivy itself in its various stages, you will see how the self-same plant adapts its different parts from time to time to every variation in the surrounding conditions. Here in the copse, left to itself, as nature made it, it spreads vaguely along the ground at first with its lower branches, developing small leaves as it goes, narrow-lobed and angular, which are pressed flat against the soil in such a way as to utilize all possible air and sunshine. They cover the ground without mutual interference. And they are evergreen, too, so as to make the best of the scanty light that struggles through the trees in early spring and late autumn, while the oaks and ashes are all bare and leafless. But the main stem, prying about, soon finds out for itself some upright bank or trunk, up which it climbs, adhering to its host by the aid of its innumerable short root-like excrescences. Here its foliage assumes still the same type as on the ground, but is not quite so closely appressed to the support, nor yet so sharply angular. The mode of the mosaic, too, has altered a little to suit the altered circumstances; the leaves now stand out more freely from the stem, yet in such a way as not to interfere with or overshadow each other. By-and-by, however, the ivy, as it grows, reaches the top of the bank, or some convenient flowering place on the friendly trunk; and then it begins to send up quite different blossoming branches. These rise straight into the air, without support on any side; unlike the creeping stems, they are stout enough and strong enough to stand alone—to bear their own weight and that of the prospective flowers and berries. Besides, they wish to be seen from all sides at once, so as to attract from far and near a whole circle of amicable birds and insects. And now observe that on these upright flowering branches the shape of the leaves changes entirely, so that you would hardly recognize them at first sight for ivy. They stand round the branch on all sides equally, and therefore have no longer any need to fit in and dovetail with one another. Each leaf is now somewhat oval in form, though sharply pointed; there are no more lobes or angles; and the outline as a whole is far fuller and usually unbroken. Yet they still avoid standing in one another’s light, and are so arranged in spirals round the stem as to interfere as little as possible with one another’s freehold.

The little yellowish-green flowers which top these branches appear in late autumn. They are not particularly conspicuous, and their petals are insignificant; yet they distil abundant honey on a disk in the centre, and they breathe forth a curious half-putrescent scent, which seems highly attractive to many carrion flies and other foul feeders. Hence you will find that butterflies seldom or never visit them; but they are frequented and fertilized by hundreds of smaller insects, for whose sake the copious honey is stored on the open disk, where it is easily accessible to even the stumpiest proboscis. Ivy, in short, is a democratic flower: it lays by no rich store of secret nectar in hidden recesses, like the honeysuckle or the nasturtium, where none but the Norman-nosed aristocrats of the insect world can reach it; it is all for the common plebs. “A fair field and no favour” is the motto it acts upon. When the berries have been thus fertilized, they lie by over winter, slowly ripening and swelling, to blacken at last in the succeeding summer. The ripe fruit is then eaten by birds, such as hawfinches and certain of the thrush tribe, which disperse the hard nut-like seeds undigested. Black or dark blue are rare colours for flowers, but common for fruits; partly perhaps because birds are less fond of bright reds and yellows than the æsthetic insects; but partly also because such dusky hues are readily seen on a tree or bush against the snows of winter, the grey brown of late autumn, or the delicate wan green of early spring foliage.