蜜腺

能分泌蜜液（花糖或花蜜）的一种腺体.位于植物体表，分泌物排出体外，故属外部分泌组织.由一群表皮细胞与相邻的深层细胞特化而来.其特点是：细胞质浓、胞壁薄、角质层无或很薄.蜜腺下常有维管组织，蜜液通过角质层扩散或经腺体上表皮的气孔排出体外.蜜腺形状各异，呈突起、扁点、小穴、小槽、喇叭状或疖瘤状等.一般位于花瓣、花萼、子房、花柱的基部或花盘上，如油菜、荞麦、紫云英、槐等.有的蜜腺生长在托叶、叶片、叶腋、花柄等处，称为花外蜜腺.蚕豆托叶的紫色部分，梧桐叶下的红色小斑，桃、樱桃、大叶野樱、腺叶野樱叶片的基部，枣、白花菜、大戟属植物的花序和荚果、梅、合欢等属植物，均具花外蜜腺.凡具蜜腺的花都是虫媒花.Can secrete Miye (Flower sugar or nectar) is a gland. In the plant surface, secretions excreted, it is the external secretion of the organization. By a group of epidermal cells and adjacent cells, specialized from the deep. Characterized by : dense cytoplasm, cell wall thin, no or very thin cuticle. nectary vascular tissue are often under, Mi Ye spread through the cuticle or epidermis of the gland pores on the body. nectary various shapes, showing processes, bian points, Koana, small trough, trumpet-shaped, or boil-like and other tumors. a general in the petals, calyx, ovary, style, or the base of the faceplate, such as rape, buckwheat, milk vetch, Ash and so on. Some of nectary growth In the stipule, leaves, leaf axillary, pedicel, etc., known to spend outside the nectary. faba bean stipule purple part of the Indus under the red leaf spot, peach, cherry, big leaf wild cherry, wild cherry leaves glandular leaf base, dates, Broccoli, Euphorbia plants inflorescence and pod, plum, Acacia and other species, both with flowers outside the nectary. where a nectary flowers are insect-flower.