GlaucousGlaucous (GLAH-cuss) leaves have the appearance of the whiti... (GLAH-cuss) leaves have the appearance of the whitish, waxy film that is epicuticular waxEpicuticular wax (Ep-i-cyoo-TI-cyoo-lar wax) is a natural, .... The term glaucous is also used to describe a shade of pale blue that appears to be seen through a waxy film; typically used to refer to blue succulents.