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. 2020 Dec 19;25(24):6025. doi: 10.3390/molecules25246025

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© 2020 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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General habit and fragments of the L. album subsp. album calyx. (b–d)—SEM; (e,f)—LM. (a) Flower bud with an open calyx. (b) Glandular (arrows) and non-glandular (double arrows) trichomes on the abaxial surface of the calyx. (c) Peltate trichome (large asterisk) and capitate trichomes (small asterisks) on the abaxial surface of a sepal nerve. (d) Cross section of a sepal with fragments of two non-glandular trichomes and a glandular trichome (arrow) on the abaxial surface. (e,f) Cross sections of sepals (Toluidine blue O staining). Abbreviations: K calyx, C corolla, Ad adaxial epidermis, Ab abaxial epidermis. Scale bars: 2 mm (a), 200 µm (b), 50 µm (d–f), 20 µm (c).