From tubers of Bletilla striata, four permethylated stilbenoids were isolated together with 3,5-dimethoxybibenzyl and the anthraquinone, physcion. The new structures were elucidated as 2,4,7-trimethoxy-phenanthrene, 2,4,7-trimethoxy-9,10-dihydrophenanthrene, 2,3,4,7-tetramethoxyphenanthrene and 3.3',5-trimethoxybibenzyl on the basis of spectroscopic data.