The sepals form a calyx around the wide hypanthium. There are 4 stamens which sometimes fill the upper part of the hypanthium. They are generally hermaphroditic and have a short hypanthium, usually cup-shaped. This differentiation between the hypanthium in particular species is useful for identification. These reproductive organs are located anterior to the hypanthium near the androgynophore. The base of the flower (the hypanthium) is glabrous and long. The posterior sepal is fused with the pedicel to form a hypanthium (nectary tube). Flowers have a hypanthium to around 3mm wide. The cup-shaped base of the flower (the hypanthium) is hairy and long. The hypanthium is considered as the floral tube. The sepals form ribs around the hypanthium, giving it a turbine-like appearance. The flowers have a hypanthium that is more than 2cm long. The flowers occur in an elongate inflorescence and have a hypanthium structure. The hypanthium is long and hairy on the outside. The stamens borne on the hypanthium are the pollen-producing reproductive organs of the flower.