Morphogenesis and Developmental Law of Glandular Hairs of Elsholtzia stauntoni Benth

The paraffin sectionning and scanning electron microscopy(SEM) were used to study the morphogenesis and law of development of Elsholtzia stauntoni Benth.The results showed that glandular hairs of E.stauntoni Benth has two main types of trichomes: trichomes without secreting cells and trichomes with secreting cells.The former include: single-cell mastoid trichomes,2-3 cells tubular trichomes,2-3 cells ramose trichomes and multicellular tubular trichomes.The latter include peltate and capitate hairs.The mature capitate glandular hairs comprise one,two or four secretory cells and its head is spherical or half spherical.The head of mature peltate glandular hairs comprises eight to twelve secretory cells and the secretory cells expand to a shield-shaped head.The glandular hairs of E.stauntoni Benth mainly occur greatly on younger leaves and start to generate from the first pair of younger leaves of stem apex.The morphogenesis of new glandular hairs can be observed to occur from young leaves stage to mature stage,however,only a relatively small amount occurs in maturation stage.