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The tree was a low one, of the locust or pseud-acacia family, and covered all over with great thorny spikes, like all trees of that tribe. François paid no attention to this; but, keeping under shelter of the underwood, he crept forward until within shot. Then raising his gun, he took aim, and pulling trigger, brought the bird fluttering down through the branches.
Seeds of the laciniated beech gave only 10% of laciniated plants in experiments made by Strasburger; seeds of the monophyllous acacia, Robinia Pseud-Acacia monophylla, were found to be true in only 30% of the seedlings. Varieties have to be freed by selection from all such impurities, since isolation is a means which is quite impracticable under ordinary circumstances.
Fortunately the direct proof of this assertion can be given, and in a case which is narrowly related, and quite parallel to that of the Desmodium, since it affects a plant of the same family. It is the case of the monophyllous variety of the bastard-acacia or Robinia Pseud-Acacia. In a previous lecture we have seen that it originated suddenly in a French nursery in the year 1855.
The following include the best and most popular kinds: R. Pseud-Acacia Decaisneana, a distinct form bearing light pinky flowers; R. Pseud-Acacia Bessoniana, with thornless branches and a dense head of refreshing Pea-green foliage; R. Pseud-Acacia angustifolia, with narrow leaves; R. Pseud-Acacia aurea, a conspicuous but not very constant golden leaved form; R. Pseud-Acacia inermis, of which there are weeping, upright, and broad-leaved forms, has narrow leaves that are glaucous beneath, and the characteristic spines of the species are wanting or rarely well developed.
The tree was a low one, of the locust or pseud-acacia family, and covered all over with great thorny spikes, like all trees of that tribe. Francois paid no attention to this; but, keeping under shelter of the underwood, he crept forward until within shot. Then raising his gun, he took aim, and pulling trigger, brought the bird fluttering down through the branches.
Then there is the peculiar R. Pseud-Acacia tortuosa, of ungainly habit; R. Pseud-Acacia umbraculifera, with a spreading head; R. Pseud-Acacia sophoraefolia, the leaves of which resemble those of Sophora japonica; and R. Pseud-Acacia amorphaefolia, with very large foliage when compared with the parent tree.
R. Pseud-Acacia monophylla is very distinct, the leaves being entire instead of pinnate; while R. Pseud-Acacia crispa has curiously-curled foliage.
The above may be taken as the most distinct and desirable forms of the False Acacia, but there are many others, such as R. Pseud-Acacia colutoides, R. Pseud-Acacia semperflorens, and R. Pseud-Acacia Rhederi, all more or less distinct from the typical tree. Clammy Locust. North America, 1797. This is a small-growing tree, and readily distinguished by the clammy bark of the younger shoots.
R. PSEUD-ACACIA. Common Locust, Bastard Acacia, or False Acacia. North America, 1640. A noble-growing and handsome tree, with smooth shoots, and stipules that become transformed into sharp, stiff spines. The flowers are in long racemes, pure-white or slightly tinged with pink, and with a faint pleasing odour.
A very pretty garden hybrid form, said to have for its parentage R. Pseud-Acacia and R. viscosa. It is of quite tree-like growth and habit, with unusually short spines, and Pea-green foliage. The flowers are produced pretty freely, and are of a pale rose colour, and well set off by the light-green leaves, over which they hang in neat and compact spikes. R. HISPIDA. Rose Acacia.
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