''Nyssa yunnanensis'' is a species of tree in the Nyssa genus. It is a

dioecious Dioecy (; ; adj. dioecious , ) is a characteristic of a species, meaning that it has distinct individual organisms (unisexual) that produce male or female gametes, either directly (in animals) or indirectly (in seed plants). Dioecious reproductio ...

tree (meaning that it has distinct male and female individual organisms) reaching in height. This flowering

canopy tree In biology, the canopy is the aboveground portion of a plant cropping or crop, formed by the collection of individual plant crowns. In forest ecology, canopy also refers to the upper layer or habitat zone, formed by mature tree crow ...

inhabits mountainous tropical bogs and marshes. Because of habitat loss and

logging Logging is the process of cutting, processing, and moving trees to a location for transport. It may include skidding, on-site processing, and loading of trees or logs onto trucks or skeleton cars. Logging is the beginning of a supply chain ...

, this species is critically endangered in the IUCN Red List of Threatened Species. It now exists only in the vicinity of Xishuangbanna, which is located in

Jinghong County Jinghong (; khb, ᨩ᩠ᨿᨦᩁᩩ᩵ᨦ; th, เชียงรุ่ง, , ; lo, ຊຽງຮຸ່ງ; also formerly romanised as ''Chiang Hung'', ''Chengrung'', ''Cheng Hung'', Jeng Hung, ''Jinghung'', ''Keng Hung'', ''Kiang Hung'' and ' ...

, Yunnan Province,

China China, officially the People's Republic of China (PRC), is a country in East Asia. It is the world's most populous country, with a population exceeding 1.4 billion, slightly ahead of India. China spans the equivalent of five time zones and ...

. Only eight individual trees and two populations have been found in the wild, and 1999 this species has been listed among China's national Class I protection species and also among 120 PSESP (Plant Species with Extremely Small Populations) in the Implementation Plan of Rescuing and Conserving China's Plant Species with Extremely Small Populations (PSESP) and as critically endangered in the Threatened Species List of China's Higher Plants. To facilitate future conservation biology studies a reference genome was sequenced, creating a 1475 Mb assembly with 39,803 protein-coding genes. DNA was collected from a voucher specimen from

Ruili Botanical Garden Founded in 2002, Ruili Botanical Garden () and Nanmaohu Park is a botanical garden in Ruili. Located 6 km from the city in Dehong Dai and Jingpo Autonomous Prefecture of Yunnan in the South-West of China near the Myanmar border. The park ...

and stored in the China National GeneBank herbarium.

References

Further reading