“ Dioscorea globosa, the most esteemed yam of India, which has very fragTant flowers, and roots white internally; Dioscorea rubella, another Indian kind, with tubers sometimes 3 feet long, tinged with red below the skin, etc. The Chinese yam (Dioscorea divaricata) is a perfectly hardy sort. Its edible club-shaped roots descend perpendicularly into the ground from two to three feet, and largely on this account it is little cultivated. ”