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Only two species are used, viz., P. aculeata and P. Bleo, the former being much the more popular of the two; whilst P. Bleo, on account of the stoutness of its stems, is employed for only the most robust kinds of grafts. Propagation. Both the above-named species may be propagated to any extent, as every bit of branch with a leaf and eye attached is capable of rooting and soon forming a stock.
In Echinocactus, too, the spines about the base of old plants are much fewer, if not entirely cast off, than on the upper part. In Pereskia the contrary is the case. Taking P. aculeata as an example, this is best known in gardens as having branches about as thick as a goose-quill, with ovate leaves, at the base of which there is a pair of curved spines, ¼ in. long, and shaped like cats' claws.
The zambos of the Rio Sinu wearied us with idle questions respecting the purpose of our voyage, our books, and the use of our instruments: they regarded us with mistrust; and to escape from their importunate curiosity we went to herborize in the forest, although it rained. The Corozo of Caripe is slender, small and covered with thorns; it approaches the Cocos aculeata of Jacquin.
On re-grafting this head on to the Cereus a little lower down, it failed to unite, and, attributing the failure to possible ill-health in the stock, we determined to transfer the Rat's-tail Cactus to a large stem of Pereskia aculeata, the result being a quick union and rapid, healthy growth since.
K. Friderich describes in detail the anatomical structures to be met with in the aerial roots of Acanthorhiza aculeata, these roots presenting a remarkable example of roots being metamorphosed into spines. Supplementing this, E. Regel made the following remarks: Palm trees, grown from seed, thicken their stems for a succession of years, like bulbs, only at the base.
During the remainder of the year, they occupy a three-quarter span-roof house, in which an intermediate temperature is maintained. All our Epiphyllums are grafted on the Pereskia aculeata. We graft a few at intervals of two or three years, so, if any of the older plants become sickly or shabby, they are thrown away, and the younger ones grown on.
"A Westfalia ham makes a man drink; drink quenches thirst: ergo a Westfalia ham quenches thirst." If these ridiculous subtleties, "Contorta et aculeata sophismata," as Cicero calls them, are designed to possess him with an untruth, they are dangerous; but if they signify no more than only to make him laugh, I do not see why a man need to be fortified against them.
A small thorny palm-tree extends also to this limit; the slender pinnate leaves of which look as if they had been curled toward the edges. This tree is very common in these mountains; but not having seen either its fruit or its flowers, we are ignorant whether it be the piritu palm-tree of the Caribbees, or the Cocos aculeata of Jacquin.
The Mauritia aculeata is called by the Indians juria or cauvaja; its leaves are in the form of a fan, and they bend towards the ground. At the centre of every leaf, no doubt from the effect of some disease of the parenchyma, concentric circles of alternate blue and yellow appear, the yellow prevailing towards the middle.
I say a breccia, because we must not confound the fresh and white corallites of this very recent littoral formation, with the corallites blended in the mass of transition-rocks, grauwacke, and black limestone. We were astonished to find in this uninhabited spot a large Parkinsonia aculeata loaded with flowers.
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