Fig. 1
![Fig. 1](http://media.springernature.com/full/springer-static/image/art%3A10.1186%2Fs12864-022-08755-7/MediaObjects/12864_2022_8755_Fig1_HTML.png)
The geographical distributions and morphological characteristics of Tetrastigma hemsleyanum from different regions. A Regional distribution map of Tetrastigma hemsleyanum sample collection (B) The microscopic characters of the dried roots from Tetrastigma hemsleyanum: 1. brown patches; 2. marginal orifice catheter; 3. cluster crystals of calcium oxalate; 4. needle crystals of calcium oxalate; 5. starch granules; 6. cork cell. C Comparison of macroscopic characters of the root tubers of Tetrastigma hemsleyanum from five different regions