Pharmacognostical study of Cynanchum stauntonii and Cynanchum glaucescens, Botanical Sources of TCM Baiqian

Conclusion Based on observation of morphological and microscopic characteristics, the two species can be distinguished by the size of the pith, proportion of xylem of rhizomes, and crude drug powder characters such as laticifers and secretory cells.
Source: Chinese Herbal Medicines - Category: Complementary Medicine Source Type: research