New Zealand Plants and their Story
Shingle-slip Vegetation
Shingle-slip Vegetation.
The rocks of the alpine summits weathering away, and the rain not being sufficient to bear all the débris into the valleys, an enormous quantity of angular stones collects on the mountain-sides in many places, which may form steep slopes for thousands of feet. As the traveller wearily ascends these "shingle-slips," as they are called, the stones constantly slip beneath his tread, and slide down the slope. Numerous large grasshoppers, grey as the shingle, leap from beneath his feet, an occasional black butterfly flits through the air or rests upon a rock, while overhead may fly screaming that famous bird the kea. All is a scene of utter desolation: it is, in truth, an alpine desert. Yet many of the meadows must have begun their career as shingle-slips, and all transitions may be noted from the one to the other.
To the shingle-slip proper belongs a most peculiar series of plants. They have several characteristics in common. All have long roots and are low-growing. Many are succulent. Most are of a colour similar to the shingle. Some have leaves of rather an indiarubber like texture, and one, at any rate, is covered with an exceedingly woolly mass of hairs. These shingle-slips become burning hot in the sunshine, and yet in the evening of the same day may be icy cold. At some distance below the surface the stones are wet. Here are a few of the plants to be found in such situations: A. stiff-leaved grass (Poa sclerophylla); a buttercup (Ranunculus Haastii); a plant of the carrot family (Aciphyila carnosula); a daisy, jet black, and with stamens like golden pin-heads (Cotula atrata); one of the pink family (Stellaria Roughii); the curious and sweet-scented penwiper plant (Notothlaspi rosulatum) (fig. 46); and a fleshy - leaved lobelia (L. Roughii).A piripiri, too (Acaena glabra), is almost confined to this peculiar station. These plants do not grow closely side by side. They are few and far between, and without close observation the slopes look quite bare. Occasionally a trailing - veronica (V. epacridea) sprawls over the stones, and is frequently accompanied by a smaller species of the whipcord form, V. tetrasticha.
Fig. 46.—The Penwiper Plant (Notothlaspi rosulatum), growing on shingle-slip of a river-terrace. Castle Hill, Canterbury.
[Photo, L. Cockayne.
Fig. 47.—The Vegetable-sheep (Raoulia eximia), a rather small example, growing on rock rising from shingle-slip. Mount Torlesse, Canterbury
[Photo, L. Cockayne.
Finally, the New Zealand, edelweiss must be mentioned, of which there are two species, Helichrysum grandiceps and H. Leontopodium. Both are exquisite, and surpass their celebrated. Swiss namesake, Leontopodium alpinum. Perhaps H. Leontopodium (fig. 50), when in-full bloom, as it may be seen in late January on the Tararua and Ruahine Mountains, is the most beautiful plant in New Zealand. A near relation, but much more common, is H. bellidioides (fig. 51).
Fig. 48.—Bringing Vegetable-sheep from 5,000 ft. on Mount Torlesse for the Christchurch Exhibition of 1906-7.
[Photo, L. Cockayne.