ChatterBank14 mins ago
money plant
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For more on marking an answer as the "Best Answer", please visit our FAQ.Because its fruits/pods are circular...ie money-shaped. Click http://www.madsci.org/posts/archives/2004-11/1100821596.Bt.r.html to reach a botanist's web-page for confirmation.
They may well be slightly ovalish, but they're sufficiently rounded for yet another horticulturalist to say on her website:
"Now in summer, the plants have developed a distinct, round, flattened seed pod. A bit later in summer as the pods dry, the outer covering turns to a satiny silver-white paper like texture, thus lending the common name of Money Plant."
Other such sites frequently refer to its papery "silver dollar" appearance.
Whatever the accuracy of the shape, it is how it got its name, which is what the question was about.
The link refers to the garden plant that's also known as "honesty", which is probably not the "money plant" you meant.
There is also a succulent houseplant called a money plant. Genus = Crassula.
You often see it in Chinese restaurants. In Chinese tradition, the money plant is never bought, instead cuttings are given as presents. It is said that as long as the plant grows and adds branches, you will be prosperous and healthy.