Acer rufinerve, the grey-budded snake-bark-maple, redvein maple or Honshū maple (Japanese: ウリハダカエデ urihadakaede, "melon-skin maple"), is a species of tree in the snakebark maple group, related to Acer capillipes (Kyushu maple). It is native to mountain forests of Japan, on Honshū, Kyūshū and Shikoku.

The Latin and English names rufinerve and "redvein" refer to the reddish down on the veins. The Japanese name urihadakaede (melon-skin) refers to the bark pattern.

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