Dioscorea Villosa (Yam)

 This is a delicate twining vine, with a perennial root.  From this root proceeds a smooth, woolly, reddish-brown stem, the sixth of an inch in diameter, and from five to fifteen or eighteen feet long.  The leaves average two to four inches in length, and about three-quarters of their length in width.  They are glabrous on the upper surface, with soft hairs on the lower.  The flowers are of a pale greenish yellow color, and are very small.  The seeds are one or two in each cell, and flat.