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Zhang Z.,Beijing Forestry University | Zhang Z.,Yachang Orchid Research Center | Yang M.,Administrative Bureau of Yachang Orchid National Nature Reserve | Yang M.,Yachang Orchid Research Center | And 7 more authors.
Phytotaxa | Year: 2015

A new species of Orchidaceae, Habenaria yachangensis, from Yachang Orchid National Nature Reserve, Guangxi, China, is described and illustrated. The new species can be distinguished from the other species in genus Habenaria by having pale green to greenish white flowers with tripartite dorsal sepal and lip, and lateral sepals with one or two teeth on one side, petals with two lateral thickenings. H. yachangensis is restricted to a single mountain top in Yachang Orchid National Nature Reserve. © 2015 Magnolia Press.

Zhang Z.-B.,Beijing Forestry University | Zhang Z.-B.,Yachang Orchid Research Center | Cheng J.,Beijing Forestry University | Yang M.,Administrative Bureau of Yachang Orchid National Nature Reserve | And 6 more authors.
Beijing Linye Daxue Xuebao/Journal of Beijing Forestry University | Year: 2015

Food-deceptive pollination is one of the significant pollination mechanisms among orchids. Given floral syndromes and low natural fruit setting rate of Vanda concolor, we assume that this orchid species is in compliance with a food-deceptive pollination mechanism. In order to test our assumption, we investigated pollination biology of V. concolor during 2012-2013 in the Yachang National Nature Reserve, which is located in northwestern Guangxi, China. Our observations confirmed that the flowers were self-compatible but required floral visitors. Both Xylocopa rufipes and Bombus kulingensis are effective pollinators with the former more effective than the latter. Foraging in the flowers mainly occurred in two periods: 68% in 10:00 am-12:30 pm and 16% in 13:30 pm-14:30 pm. Mahonia beaill, Stachyurus chinensis and Vanda concolor have the same flowering season in the study area, and the bright yellow color of Mahonia beaill flowers is similar to the color of spots on Vanda concolor flowers. Five chemical compounds have been identified as the volatile constituents of flower fragrance of the orchid, of which 1,6,10-dodecatrien-3-ol, 3,7,11-trimethyl-, (E)-(29.6%) and cinnamaldehyde, (E)-(27.0%) are the most abundant compounds. We consider that the plant attracts pollinators into flowers for foraging by floral fragrance and yellow spots in flowers, and it follows the food-deceptive pollination mechanism. ©, 2015, Beijing Forestry University. All right reserved.

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