Tropic Days | Page 5

lanceolate leaves with two short lateral lobes, with many intermediate forms. As the plant develops, the abnormal forms tend to disappear, though mature plants occasionally retain them. There seems to exist correlation between foliage and fruit, for branches exhibiting leaves with never so slight a variation from the type are, according to local observation, invariably barren. The leaves, which, when young, are densely hairy on the underside, on maturity become so rough and coarse that they are used by the blacks as a substitute for sandpaper in the smoothing of weapons. The fruit is small, dark purple when ripe, sweet, but rough to the palate.
During the fulness of the wet season, a diminutive orchid, the roots, tuber, leaf, and flower of which may be easily covered by the glass of a lady's watch, springs upon exposed shoulders of the hills. So far it has not been recorded for any other part of Australia, or, indeed, the world. Science has bestowed upon it the title of CORYSANTHES FIMBRIATA, for it is all too retiring of disposition to demand of man a familiar name. Probably it may be quite common in similar localities, but its size, its brief periodicity, and inconspicuousness, contribute to make it, at present, one of the rarities of botany. Beneath a kidney-shaped leaf a tiny, solitary, hooded, purple flower shelters with becoming modesty, the art of concealment being so delicately employed that it seems to preserve its virginal purity. There is proof, however, that the flower does possess some "secret virtue," for if the plant be immersed in glycerine the preservative takes the hue of the flower. Nature having ordained that the plants should be elusive, they appear in remote spots and unlikely situations with foothold among loose and gritty fragments of rock, and with cessation of the sustaining rains disappear, each having borne but a single leaf and produced but a solitary flower. The leaf does not seem to be attractive to insects, nor is the flower despoiled or the tuber interfered with. The first dry day sears the plants, and succeeding days shrivel them to dust and they vanish. What part in the great scheme of Nature does the humble flower fulfil? Or is it merely a lowly decoration, not designed to court the ardent gaze of the sun, but to brighten an otherwise bare space of Mother Earth with a spot of fugitive purple?
Widely different are the ant-house plants, of which North Queensland has two genera. One is purely an epiphyte, growing attached to a tree like many of the orchids. In both genera the gouty stems are hollow, a feature of which ants take advantage; they are merely occupiers, not the makers of their homes. Few, if any, of the plants are uninhabited by a resentful swarm, ready to attack whomsoever may presume to interfere with it. It is discomposing to the uninitiated to find the curious "orchid," laboriously wrenched from a tree, overflowing with stinging and pungent ants, nor is he likely to reflect that the association between the plant and the insect may be more than accidental.
Some of the commonest wattles exhibit singularity of foliage well worth notice. Upon the germination of the seeds the primary leaves are pinnate. After a brief period this pretty foliage is succeeded by a boomerang-shaped growth, which prevails during life. Botanists do not speak of such trees as possessing leaves, but "leaf-stalks dilated into the form of a blade and usually with vertical edges, as in Australian acacias." If one of these wattles is burnt to the ground, but yet retains sufficient life to enable it to shoot from the charred stem, the new growth will be of pinnate leaves, shortly to be abandoned for the substitutes, which are of a form which checks transpiration and fits the plant to survive in specially dry localities. Several of the species thus equipped to withstand drought are extremely robust in districts where the rainfall is prolific. There are no data available to support the theory that such species in a wet district are more vigorous and attain larger dimensions than representatives in drier and hotter localities. In her distribution of the Australian national flower, Nature seems to be "careless of the type," or rather regardless in respect of conditions of climate.
Human beings, and occasionally animals lower in the scale, deviate distressingly in their conduct from the general. Plants, too, though lacking the organ of brain, are subject to aberrations of foliage almost as fantastical as the mental bent which in man is displayed by the sticking of straws in the hair. "Phyllomania" is the recognised term for this waywardness. One of the trees of this locality, the raroo (CAREYA AUSTRALIS), seems singularly prone to the infirmity, for without apparent cause it abandons habitual ways and clothes its trunk