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. 2019 Oct 26;19:451. doi: 10.1186/s12870-019-2067-5

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© The Author(s). 2019

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 2 — Anatomical structure of P. notoginseng taproots at different developmental stages. a March. b-e May to August. f, g October–November. Avc, accessory cambium. Co, cortex. Ep, epidermis. Ppc, phloem parenchyma cell. Pph, primary phloem. Px, primary xylem. Sph, secondary phloem. Sx, secondary xylem. Vc, vascular cambium