Various hardy ornamental trees are also increased in this way, as the quince, elm, robinia and mulberry, and the rose amongst shrubs.
They may assume a hard and spiny character, as in Robinia Pseudacacia (fig.
The leaves of barberry and of some species of Astragalus, and the stipules of the false acacia (Robinia) are spiny.
In common language the term Acacia is often applied to species of the genus Robinia which belongs also to the Leguminous family, but is placed in a different section.
Robinia Pseud-acacia, or false acacia, is cultivated in the milder parts of Britain, and forms a large tree, with beautiful pea-like blossoms. The tree is sometimes called the locust tree.