In the water, too, I see the brown leaves of the perfoliate pondweed; they are almost transparent, and look when dry something like gold-beater's skin.    From Wordnik.com.  [Country Walks of a Naturalist with His Children] Reference

•9 umbellatcd FEVER WORT perfoliate GLOBE FLOWER American TOWER MUSTARD.    From Wordnik.com.  [Transactions of the Society for the promotion of useful arts, in the state of New York] Reference

The leaves are 2in. long, oval, lance-shaped, distinctly ribbed, somewhat lobed at the base, and stem-clasping, which gives the pair of leaves a joined or perfoliate appearance; the nodes are short, or near together, the lower ones being the more distant, where also the leaves are much smaller; the foliage is a glossy dark green colour, the whole plant having a sombre but rich effect.    From Wordnik.com.  [Hardy Perennials and Old Fashioned Flowers Describing the Most Desirable Plants, for Borders, Rockeries, and Shrubberies.] Reference