Botany for Ladies: or, A Popular Introduction to the Natural System of Plants, According to the Classification of De Candolle.Loudon, Mrs. (Jane)
Science
Botany for Ladies: or, A Popular Introduction to the Natural System of Plants, According to the Classification of De Candolle.
Loudon, Mrs. (Jane)
Botany; Plants -- Classification
together and one free; and in others the whole are joined together
at the base. The pods also vary very much in size and form; being
sometimes nearly round, and only one or two-seeded; and in others
long, and containing many seeds, as in the common bean or pea. The
seeds themselves are so different that the tribe has been divided, on
account of them, into two sections: the one consisting of those plants
which, like the common bean, have the seed dividing into two fleshy
seed-leaves or cotyledons, when it begins to germinate; and the other,
the seed-leaves of which are thin. The seeds of the papilionaceous
plants which have thin cotyledons are not eatable; but those with
fleshy cotyledons may be safely used as food. The fleshy cotyledons
do not always rise above the ground; but they do so decidedly in the
bean and the lupine; and if either of these seeds be laid in moist soil
with the hilum or scar downwards, the seed, as soon as it begins to
germinate, will divide into two parts (that is, into two cotyledons),
which will rise above the ground, and become green like leaves; though,
from still retaining their roundish form, they are easily distinguished
from the true leaves, which rise in the centre. Though my readers will
have no difficulty in recognising most of the Leguminosæ which have
papilionaceous flowers, there are some genera, respecting which they
may be interested to learn a few particulars. Thus, the Chorozema
is one of the kinds with thin cotyledons, and consequently its seeds
are not eatable. The legumes of this genus are roundish, and swelled
out, so as to bear but little outward resemblance to a pod. Sophora,
Edwardsia, Virgilia, Podolobium, Callistachys, Brachysema, Burtonia,
Dillwynia, Eutaxia, Pultenæa, Daviesia, and Mirbelia, have all thin
cotyledons, and their ten stamens all separate from each other; but
in Hovea, Platylobium, and Bossiæa, though the cotyledons are thin,
the stamens all grow together at the base. I mention these common
greenhouse shrubs, that my readers may have an opportunity of examining
their botanical construction, and thus verifying their names. The
common furze (_Ulex europæus_), the Spanish broom (_Spartium junceum_),
the Petty whin (_Genista Anglica_), the Laburnum (_Cytisus Laburnum_),
and the common broom, all belong to this division, and consequently
their seeds are not eatable; those of the Laburnum are indeed
poisonous. The distinctions between Spartium, Genista, and Cytisus, are
very slight, lying chiefly in the calyx; and as a proof of this the
common broom, which is now called _Cytisus scoparius_, was formerly
supposed to be a Spartium, and afterwards a Genista.
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