Cydista and Pachystegia, are related to what?
Cydista Cydista is a genus that consists of more than twenty species of lowland, showy, evergreen, ornamental shrubs and woody vines, ranging from central and southern Mexico to Paraguay and eastern Brazil. The genus is characterized by the lack of a nectariferous disk and is associated with the multiple-bang flowering syndrome. All species are lianas with clusters of funnelform flowers, bloomig twice a year in spring and fall. The flowers start of purple and change to a lighter shade of lavender with age, then fading to almost white, followed by linear oblong fruits and winged seeds. The plants are multi-stemmed with opposite, oval, glossy, dark-green leaves and 2 leaflets, and climb by tendrils arise from the leaf axils. Leaves smell like garlic when crushed.
Cistaceae The Cistaceae are a small family of plants (rock-rose or rock rose family) known for their beautiful shrubs, which are profusely covered by flowers at the time of blossom. This family consists of about 170(-200) species in nine genera that are not very distinct, distributed primarily in the temperate areas of Europe and the Mediterranean basin, but also found in North America; a limited number of species are found in South America. Most Cistaceae are subshrubs and low shrubs, and some are herbaceous. They prefer dry and sunny habitats. Cistaceae grow well on poor soils, and many of them are cultivated in gardens.