Ryōan was a physician who published many books during his lifetime. His most famous book was entitled Wakan Sansai Zue (Illustrated Sino-Japanese Encyclopedia). Published in 1712, many of its 105 volumes included pictures of plants. Thirty-seven of these pictures, included in volumes 103 and 104, are shown in this gallery. Click on a picture to enlarge it. The plant subjects were drawn only semi-accurately and colored in shades of gray. Consequently, it would have been a challenge to identify plants in the field using these drawings.

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