Costus dubius (Afzel.) K.Schum.
Schumann, K.M. (1904) Pflazenreich Heft 20: 409. Type: ?.
Zingiber dubium Afzel., Rem. guin. ii: 9(1813), Type: ?.
Tall perennial herb up to 2 m high.
Leaf blades obovate-elliptic, 20-30 x 4-9 cm, cuneate at the base, free petiole 0.5-0.6 cm long, sheathing petiole about 3 cm long forming a prominent shoulder. Venation +/- parallel but each vein attached to the midrib., surfaces pubescent.
Inflorescences borne on separate stalks arising from the rhizome. The inflorescence is rounded, with tightly fitting green bracts, out of which white flowers with a yellow-centered labellum arise. A single flower is borne in each bract.
Features not available.
Distribution and Ecology
An introduced species originally from West Africa but now naturalized in NEQ with specimens collected from the Cape Tribulation and Tully Falls areas. Altitudinal range from . Grows in rainforest and notophyll vine forest.
Cultivated as ornamentals or house plants and locally used for medicinal purposes. Inflorescence used for eye treatments; pregnancy, antiaborifacients and the stem for naso-pharyngeal affections (Burkill 1985).
Herb (herbaceous or woody, under 1 m tall)
Shrub (woody or herbaceous, 1-6 m tall)