Orchidantha maxillarioides

Family: Lowiaceae
Suborder: Lowiineae

Extensive prolongation of ovary to form a solid tube; petals not fused; median petal free, forming labellum; median stamen of outer whorl fertile; median stamen of inner whorl absent.

Short or no prolongation of ovary to form a solid tube; petals fused at least at base; median petal not forming labellum; median stamen of outer whorl modified, sterile; median stamen of inner whorl present.