https://flic.kr/p/cjC1Gd | Azalea Luteum | Rhododendron luteum, Yellow Azalea or Honeysuckle Azalea Luteum is the most fragrant of our deciduous azaleas. The yellow funnel shaped flowers smother the shrub in May. Another special feature, apart from the perfume, is the mid green leaves which take on vivid red shades in autumn.