T. alyssifolium, cross-section of the leaf (A), stem (B, C); cl: collenchyma; en: endodermis; gt: glandular trichomes; le: lower epidermis; p: parenchyma; ph: phloem; pp: palisade parenchyma; sc: sclerenchyma; scr: sphaerocrystal, sg: starch grains; sp: spongy parenchyma; t: trichome; ue: upper epidermis; xy: xylem; Scale bars: 50 mµ.