Can both Pieris and Lechenaultia plants have leaves? 
Pieris (plant):  Known commonly in North America as andromedas or fetterbushes, they are broad-leaved evergreen shrubs growing to 1 - tall and 3 - wide. Lechenaultia:  Some species of this genus are used like ornamental plants. "Lechenaultia" species are diverse in form: they may be woody or herbaceous, upright or prostrate with leaves flat, needle-like or virtually absent in mature plants.
yes