Hortirculturists or botanists! Questions!

[hyphenate]

There's a plant, usually a desktop/house plant that I was trying to think of the name of. It's got extremely sensitive leaves. If you touch the leaves, they actually retreat and/or seem to shrivel. For some reason, I want to say their name includes the word "monk" but I could be mistaken on that.

Second question is similar, and it might actually be the same plant. It has a very pronounced sensitivity to water. If you miss watering it for even a day, it looks like it's going to die. Add a little water, and voila! seconds later, it's back to normal.

I know I'm not imagining these plants, as I've actually owned at least one of each (or the same?) plant in the past. But for the life of me, I can't recall their names. I used to be really good at naming different houseplants.

[xray s]

1. maybe this?

http://www.hort.purdue.edu/newcrop/CropFactSheets/mimosa.html