Fig. 2
The pictures of vegetable samples including a. peppermint (Mentha x piperita), b. lettuce (Lactuca sativa), c. coriander (Coriandrum sativum), d. leek (Allium porrum), e. gotu kola (Centella asiatica), f. celery (Apium graveolens), g. Chinese cabbage (Brassica rapa subsp. pekinensis), h. culantro (Eryngium foetidum), i. Thai basil (Ocimum basilicum), and j. Chinese morning glory (Ipomoea aquatica)