Figure 5. Structures of the median nervure, petiole and stem of Scutellaria agrestis. (Cross sections. B-E, petiole and F-I, stem).
A. median nervure; B. general appearance; C. cells of the epidermis storing anthocyanin; D. collenchyma (PAS) in the rib region;
E. capitate trichome; F. general appearance; G. epidermis and endoderm evidenced by the sudan IV; H. cortex and vascular tissue;
I. phloematic fibers and cells of the xylem (phloroglucinol). (AbE: abaxial epidermis; AdE: adaxial epidermis; AVT: accessory
vascular tissue; Co: collenchyma; CPa: chlorophyllian parenchyma; Ep: epidermis; En: endodermis; Fi: fiber; FVT: fasciculated
vascular tissue; IVT: interfasciculated vascular tissue; GT: glandular trichome; Pa: parenchyma; Ph: phloem; Pi: pith; Ri: rib; St:
stomata; TT: tector trichome;VT: vascular tissue; Xy: xylem. Bar: A. 70 μm; B. 110 μm; C. 25 μm; D. 60 μm; E. 15 μm; F. 150