Mussaenda 'Queen Sirikit' is a shrub to 7 m tall with dense hairs on the stems. Leaves are about 15 x 8cm., ovate shaped with a pointed apex and sometimes-hairy underneath. In this Mussaenda cultivar the bract-like calyx lobes (calycophylls) are actually more colorful and showy than the flowers. Each flower has 5 pale pink calycophylls up to 15 cm long. The actual corollas are much smaller (and bright yellow. This cultivar rarely sets fruit.