The expression "double-flowering" and
“semi-double flowering” does not refer to the number of
flowers. Rather, the number of
petals in
each flower is at least double the number in the regular type.
Most native
type of plant are usually "single-flowering" that means
they have a defined and limited number of petals arranged in one
row. As this native plant passed into
cultivation
several valuable double-flowering
cultivar
have been derived and
selected by gardeners, which took
advantage of a wild flower's natural tendency to develop petals
from stamens and to become "double" (e.g. roses, carnation and
chrysanthemums)
In fact some simple type of flowers changed their outer row of
stamens into petaloids, which gradually
acquired the colour and
appearance of true petals developing a more or les tight
rosette
appearance.
Some double flowered form are charming, very different
and highly appreciates as ornamental items and have become
very popular. Newer double-flowering cultivars, will most likely cost
more than traditional singles.
Some double-flowering types especially can be so top-heavy that
they flop under their own weight unless supported
The Latin name for double flowering is "flore pleno" A double
form may be also designated botanically “plena” or “pleniflora”
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