Subjects: Biology >> Botany >> Botany research, experiment, plant evolution & development submitted time 2018-06-25 Cooperative journals: 《广西植物》
Abstract： Medog County, Tibet is located at the junction of the Eastern Himalaya and Indo-Burma region, one of biodiversity hotspot in Himalaya areas, which is the core area of Yarlungzangbo Grand Canyon National Nature Reserve. The county has a mild subtropical climate. As the lowest area in Tibet Plateau, it is an ideal place in Tibet with the mildest climate, the most abundant rainfalls and the best preserved ecological environment. It is known as Tibet’s Xishuangbanna, it is abundant with immense forests, alpine lakes and raging waterfalls. During our botanical survey in Medog county of southeastern Tibet. Two new records to flora of China, Ceratostylis radiata J.J.Sm. and Bulbophyllum psychoon Rchb.f. (Orchidaceae), are described and illustrated. Ceratostylis radiata has white flower, star-shaped without colored spot, with short stem 2–2.5 cm, lip 3-lobed. Bulbophyllum psychoon is similar to B. levinei, but this species was easy identified by its petals ovate, apex obtuse, flowering from November to December. Both of the voucher specimens were deposited in Herbarium of XZ and PE. Both of orchids are original distributed in India, Myanmar and Vitenam. The discovery of the two new record species in Medog, enriches the plant species in the Southeast of Tibet in China, shows that there is a certin relationship between the flora of Medog and the original distribution areas, and it also confirms that Medog is a subtropical region and the species of distribution elevation above the orginal distribution range, flowering period also delayed. Over-collection and habitat destruction are the most threat to orchid species in this area.
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