The leaves on a mature eucalyptus plant are commonly lanceolate, petiolate, apparently alternate and waxy or glossy green. In contrast, the leaves of seedlings are often opposite, sessile and glaucous, but many exceptions to this pattern exist. Many species such as "E. melanophloia" and "E. setosa" retain the juvenile leaf form even when the plant is reproductively mature. Some species, such as "E. macrocarpa", "E. rhodantha", and "E. crucis", are sought-after ornamentals due to this lifelong juvenile leaf form. A few species, such as "E. petraea", "E. dundasii", and "E. lansdowneana", have shiny green leaves throughout their life cycle. "E. caesia" exhibits the opposite pattern of leaf development to most eucalyptus, with shiny green leaves in the seedling stage and dull, glaucous leaves in mature crowns. The contrast between juvenile and adult leaf phases is valuable in field identification.