 There is a tube-shaped outer calyx, 5.5–7 cm long with a two-toothed apex, which is pale green to white.Next the three petals (the corolla) form a long tube, 10–12.5 cm in length, terminating in three lobes, a narrow upright central lobe, 1.5–2.5 cm long by 8–12 mm wide, and two somewhat narrower side lobes, 1.5–2.5 cm long by 3–4 mm wide.Inside the petals are structures formed from four sterile stamens (staminodes)