...Their surface, at first smooth, later becomeslumpy and tuberous from internal degeneration... 
U.S. Department of Agriculture 「Special Report on Diseases of Cattle」
...When full grown, they addto this diet beans, peas, acorns, beech-mast, and the tuberous rootsof several wild plants...
Rev. C. A. Johns 「British Birds in their Haunts」
...Bulbous, Tuberous, Fibrous, Rooted, and Shrubby Flowers...
W. S. Coleman 「British Butterfiles」
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