关键词: 石竹, 庐山小檗, 活血丹, 紫云英, 花蜜腺

Abstract: The structure of floral nectaries of following species:Dianthus chinensis, Berberis virgetorum, Glechoma longituba and Astragalus sinicus were investigated with light microscope and scanning electron microscope. The nectary of D. Chinensis belongs to stamen type. The surface of epidermis is covered with thick cuticle which has small pores. The nectar is secreted by way of the small pores. The nectary of B. virgetorum belongs to perigonial type. The epidermal cells have indentation where the nectar is secreted to, and they are covered with thin cuticle. During the accumulation of the nectar, the pressure of the nectar to the cuticle is increasing, until the cuticle is broken and the nectar flows out. G. longituba and A. sinicus belong to torus type. The former secretion is brought about by epidermal cells which covered with thin cuticle. The latter secretion is secreted by way of modified stomata. Differentiation of vascular tissue in the nectaries of the four species is different and may be classified into three types.

Key words: Dianthus chinensis, Berberis virgetorum, Glechoma longituba, Astragalus sinicus, nectary