Description: Mimosa pudica is a leguminous perennial herb or subshrub, up to about one meter tall, its stem is cylindrical, there are many branches.Its stipules are lanceolate and between five and ten millimeters in length.Its leaflets are generally symmetrically distributed, about ten to twenty pairs, the apex is sharp, the whole shape is like a feather.
Flowers: Mimosa flowers are capitulum, plush appearance, color is white or pink, smaller, its calyx is bell-shaped, the overall look is very delicate and lovely, has a good ornamental value.Flowering is usually in September.
Pod: Mimosa's pod is generally oblong, between one and two centimeters long, about five millimeters wide, relatively flat, slightly curved.It contains seeds, which are ovoid and about 3.5 mm in length.
Reaction: Mimosa because of its leaves by the outside world to stimulate the automatic closure of the name, after the closure of it will slowly open.However, if the stimulation is too much, it may produce a sense of "boredom" and no longer want to respond to external stimuli.The specific reason is that the cytosol in the parenchyma cells of the pulvinus loses too fast to be replenished in time.
The reason why Mimosa pudica responds to external stimuli lies in one of its special organs.This organ is called the pulvinus.The petiole contains many parenchyma cells, and whenever there is a stimulus from the outside world, the cell fluid in the parenchyma cells in the upper part of the pulvinus will be discharged into the intercellular space, so that the turgor pressure in the upper part of the pulvinus is greatly reduced, but the turgor pressure in the lower part remains unchanged, which makes the two small leaves closed, and sometimes the whole leaf will droop.When the cell fluid returns, the leaves will open again and return to their original shape.
