One wonders why a common name of medusa-like habenaria might be suggested for this species, when the scientific name covers those terms in fewer letters. Perhaps just “medusa orchid” would suffice?
Habenaria medusa is native to parts of Indonesia. If, as some have asserted, it is the same entity as Habenaria myriotricha, then its range also includes Laos, Vietnam, and the Yunnan province of China. Or, as noted by Tom Mirenda of the Smithsonian Gardens in Orchid Oddity: Habenaria medusa, it “is a terrestrial orchid of monsoonal habitats in Indonesia and mainland southeast Asia”.
Tom also states that flowers with fringes often attract moths as pollinators, though the whys of this association remain unstudied. Other factors which lead people to believe this is moth-pollinated (phalaenophily) are the white flowers which are sweetly-scented in the evening and the presence of a nectar spur (easily seen in the developing flowers).
Additional photographs of this grassland orchid are available via the Pacific Bulb Society: Habenaria spp..