Garden Club of Chester, New Jersey
Experts say the "remarkable" species is the only orchid known to consistently flower at night, but why it has adopted this behaviour remains a mystery.
The plant was discovered by a Dutch researcher during an expedition to New Britain, an island near Papua New Guinea.
The findings appear in the Botanical Journal of the Linnean Society.
"It was so unexpected because there are so many species of orchids and not one was known [to flower] at night only," said co-author Andre Schuiteman, senior researcher and an orchid expert at the Royal Botanic Gardens, Kew.
"It was quite remarkable to find one, after so many years of orchid research, that is night-flowering," he told BBC News.
The specimen was discovered by co-author Ed de Vogel during a field trip in a region of lowland rainforest on the Pacific island.
Its unique flowering behaviour only came to light after the specimen was taken back to the Netherlands.
Dr de Vogel took the plant home in an attempt to understand why its buds appeared to wither when they reached a size that would normally produce 2cm flowers. To his surprise, he observed the flowers open a few hours after dusk and remain open until a few hours after sunrise. The flowers opened for one night only, explaining why the buds appeared to be preparing to open one day, yet be withered the next day.
The specimen has been identified as belonging to the Bulbophyllum genus, which - with about 2,000 species - is the largest group in the orchid family. While there are a number of orchids that do attract night-time pollinators, B. nocturnum is the first known species that exclusively flowers at night.
Mr Schuiteman said it still remained a mystery why the plant had developed such behaviour. "We think related species are pollinated by tiny flies that think they are visiting fungi," he explained. "The flowers mimic fungi, that's what the details of the flowers look like they do. The flies are looking for somewhere to lay eggs, and it is most probably [a species] that forages at night."
He added: "The orchid probably has a smell, not detectable by humans, to attract insects from a distance - and when they are nearby, the shape and physical aspects of the flower probably play a role too.
Mr Schuiteman said the exact reason why B. nocturnum only flowered at night would remain a mystery until further field studies had been completed.
He called for areas to be left untouched, "It is the government that gives permits to log a particular area, so we should be asking them to protect areas and not issue permits for everything."
Comments are closed for this blog post