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The scientific name derives from the clam’s appearance — siliqua being Latin for “pod,” and patula for “open” or “gaping.”

When the fruit is several times longer than broad it is known as a siliqua, as in stock or wallflower; when about as long as broad, a silicula, as in shepherd’s purse.

Each of these they again divide into twenty-four units of four siliquae each, which they call grenlins.

Here, too, may also be mentioned the presence of an adventitious siliqua within the ordinary one attached along the same line as the ovules, and partially divided by a replum into two cavities.

The Cassia fistula of Ceylon resembles it somewhat in flavour, but the Ceratonia siliqua is free from the medicinal properties of the former tree.