The real name is Mimosa Pudica for this plant. It is one of the most fascinating plants I have seen here. In Florida, we have fly-catcher plants that close up when a fly lands on it but these "sensitive plants" close when touched, the temperature changes, or the sun goes down. That is known as seismonastic or nyctinastic movement according to Wikipedia. I think the birds brought this plant to my house as a seed.
When you touch these plants, their response is instantaneous. The leaves collapse on each other in a nano-second in the area touched. Quite amazing. After a short time, they will start unfolding and open up again. It closes with the sun going down and opens again each morning with the sunrise. The mature plant also has blooms. My plant hasn't bloomed yet. They have prickly leaves so you don't want to step on them barefooted.
Just thought I'd share some of the incredible works of nature right here in my own yard.
For more information, click on this site: http://en.wikipedia.org/wiki/Sensitive_plant
Left photo: Now you see it...
Right photo: Now you don't!
A plant with a disguise.
Nature can be very clever.
Click onto photo to enlarge.
Click the arrow in the upper left
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Other links sent in by readers: www.TickleMePlant.com and www.sensitiveplant.com (see comments)