中国兰科植物研究杂记(英文)

Additional notes on Orchidaceae from China

关键词:  新记录, 兰科, 西藏牛角兰, 格当石豆兰, 西藏, 中国

Key words:  new record, Orchidaceae, Ceratostylis radiata, Bulbophyllum psychoon, Tibet, China

摘要:

中国西藏墨脱县位于东喜马拉雅和印缅交界地区,是雅鲁藏布江大峡谷国家级自然保护区的核心区域,是喜马拉雅生物多样性热点地区之一。该文通过对中国西藏墨脱的科学考察,报道了中国兰科植物2个新记录种,即西藏牛角兰(Ceratostylis radiata)和格当石豆兰(Bulbophyllum psychoon),并提供了描述和图片。西藏牛角兰花为纯白色,花辐射对称,唇瓣3裂,茎长2～2.5 cm,明显区别于该属内其他种。格当石豆兰与齿瓣石豆兰(Bulbophyllum levinei)相似,但不同之处在于格当石豆兰的花瓣卵形,先端锐尖。凭证标本分别保存于西藏自治区高原生物研究所(XZ)和中国科学院植物研究所(PE)标本馆中。2个新记录种原分布均在印度、缅甸和越南等地区,在中国西藏的发现说明了中国西藏墨脱的植物区系和原分布地有一定的关系,同时也印证了中国西藏墨脱属于亚热带地区,且2个新记录种的分布海拔超出了原分布地范围,开花的时间也相对推迟。此新记录种的发现对摸清该区植物种类和丰富中国西藏植物区系提供了更加详实的资料。

Abstract:

Medog County, Tibet, China 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. During our botanical survey in Medog County of Southeast 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 can be easily identified by its petals ovate, apex obtuse. Both of the voucher specimens were deposited in Herbarium of XZ and PE. Both of orchids were original distributed in India, Myanmar and Vitenam. The discovery of the two new record species in Medog, enriches the plant species in Southeast Tibet of China, which indicates that there is a certin relationship between the flora of Medog and the original distribution areas, and also confirms that Medog is a subtropical region with the species of distribution elevation above the orginal distribution range, and delayed flowering period. Discovery of this new record orchid species further highlights the value for biodiversity conservation of Southeast Tibet, China, and calls for more comprehensive exploration on botanical survey, study, and conservation in this region.