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The Sensitive plant (Mimosa pudica L.) is a creeping annual or perennial herb often grown for its curiosity value: the compound leaves fold inward and droop when touched, re-opening within minutes. Mimosa pudica is native to Brazil, but is now a pantropical weed. Other names given to this curious plant are Humble plant, Shame plant, Sleeping grass, Prayer Plant, Touch-me-not, Makahiya (Philippines, meaning "shy"), and Mori Vivi (West Indies). The Chinese name for this plant translates to "shyness grass". The species epithet, pudica, is Latin for "bashful" or "shrinking".
The stem is erect in young plants, but becomes creeping or trailing with age. The stem is slender, branching, and sparsely to densely prickly, growing to a length of 1.5 m (5 ft). The leaves are bipinnately compound, with one or two pinnae pairs, and 10-26 leaflets per pinna. The petioles are also prickly. Pedunculate (stalked) pale pink or purple flower heads arise from the leaf axils. The globose to ovoid heads are 8-10 mm in diameter (excluding the stamens). On close examination, it is seen that the floret petals are red in their upper part and the filaments are pink to lavender. The fruit consists of clusters of 2-8 pods from 1-2 cm long each, these prickly on the margins. The pods break into 2-5 segments and contain pale brown seeds some 2.5 mm long.Plant movement
Mimosa pudica is well known for its rapid plant movement. In the evening the leaflets will fold together and the whole leaf droops downward. It then re-opens at sunrise. This type of motion has been termed nyctinastic movement. The leaves also close up under various other stimuli, such as touching, warming, or shaking. The stimulus can also be transmitted to neighbouring leaves. These types of movements have been termed seismonastic movements. The cause is a loss of turgor pressure. The movement is caused by "a rapid loss of pressure in strategically situated cells that cause the leaves to droop right before one’s eyes".[1]

[edit] Medicinal Properties
The plant lajjalu described in Ayurveda has been identified as Mimosa pudica. This plant has several alternate Sanskrit common names, including Namaskari, and Rakta Paadi.
In Ayurveda, the plant is described as a plant which folds itself when touched and spreads its leaves once again after a while. It is said to have a bitter and astringent taste, and stops bleeding and speeds healing. It is used for diarrhea (athisaara), Amoebic dysentery (raktaatisaara), bleeding piles, gynecological disorders, skin diseases, bronchitis, general weakness and impotence. Most commonly used is the root, but leaves, flowers, bark, and fruit can also be encountered.

[edit] Ayurvedan Properties (guna) of Lajjalu

Has tikta and kashaya rasa (bitter and astringent taste).
Has property of cold (sheetha).
Balances kapha, pitta.
Shushrutha has placed this plant in Priyangwambhastaadi gana.

[edit] Cultivation
In cultivation, this plant is most often grown as an indoor annual, but is also grown for groundcover. Propagation is generally by seed. In the southern United States and Hawaii, this plant is considered an invasive weed.


圖片參考：http://upload.wikimedia.org/wikipedia/commons/thumb/f/fb/Mimosa_pudica_open.JPG/250px-Mimosa_pudica_open.JPG



圖片參考：http://en.wikipedia.org/skins-1.5/common/images/magnify-clip.png
Mimosa pudica with leaves open


圖片參考：http://upload.wikimedia.org/wikipedia/commons/thumb/4/4e/Mimosa_pudica_closed.JPG/250px-Mimosa_pudica_closed.JPG



圖片參考：http://en.wikipedia.org/skins-1.5/common/images/magnify-clip.png
Mimosa pudica with leaves closed




iMimosa pudica


圖片參考：http://upload.wikimedia.org/wikipedia/commons/thumb/1/17/Mimosa_pudica0.jpg/240px-Mimosa_pudica0.jpg

Sensitive Plant (Mimosa pudica)
foliage and flower-head

Scientific classification





Kingdom:
Plantae


Division:
Magnoliophyta


Class:
Magnoliopsida


Order:
Fabales


Family:
Fabaceae


Subfamily:
Mimosoideae


Genus:
Mimosa


Species:
M. pudica



Binomial name

Mimosa pudica
L.


[edit] External links

Sensitive Plant by Dr. T. Ombrello
Nyctinasty and Mimosa leaf movement by John Hewitson
Videos of the sensitive plant 1 2
Retrieved from "http://en.wikipedia.org/wiki/Mimosa_pudica"

detail

Mimosa is a genus of about 400 species of herbs and shrubs, in the subfamily Mimosoideae of the legume family Fabaceae, with evenly bipinnate leaves. The best-known species is Mimosa pudica, which is also known as the sensitive plant or sleeping grass because of the way it folds its leaves down when touched or exposed to heat; many others also fold their leaves in the evening. It is native to southern Mexico and Central America but is widely cultivated elsewhere for its curiosity value, both as an indoor plant in temperate areas, and outdoors in the tropics. Outdoor cultivation has led to weedy invasion in some areas, notably Hawaii.