Cistus salviifolius, common names sage-leaved rock-rose, salvia cistus or Gallipoli rose, is a perennial ligneous plant of the family Cistaceae.
Kohleria is a New World genus of the flowering plant family Gesneriaceae.
 The plants are generally tropical herbs or subshrubs with velvety stems and foliage and brightly colored flowers with spots or markings in contrasting colors.
 They are rhizomatous and commonly include a period of dormancy in their growth cycle.
 The genus was recently revised by Kvist & Skog (1992) and was recognized as having 19 species distributed in Central America and South America.
 Recent phylogenetic work by Roalson et al. (2005) indicated that the epiphytic genus "Capanea" is derived from within Kohleria, and the two species of "Capanea" were subsequently transferred to "Kohleria".
 The genus "Pearcea" is closely related.
Cistus (from the Greek "kistos") is a genus of flowering plants in the rockrose family Cistaceae, containing about 20 species (Ellul "et al." 2002).
 They are perennial shrubs found on dry or rocky soils throughout the Mediterranean region, from Morocco and Portugal through to the Middle East, and also on the Canary Islands.
Cistus monspeliensis is a species of rockrose known by the common name Montpellier cistus.
 It is native to southern Europe and northern Africa, in the Mediterranean forests, woodlands, and scrub ecosystems of matorral—maquis shrublands.
Cistus ladanifer is a species of flowering plant in the family Cistaceae.
 It is native to the western Mediterranean region.
 Common names include gum rockrose, laudanum, labdanum, common gum cistus, and brown-eyed rockrose.

Question: What do Cistus and Kohleria have in common?
Answer: flowering plant