Woon Young Chun

Cathaya is a genus in the pine family, Pinaceae, with one known living species, Cathaya argyrophylla. In foliage and cone morphology, Cathaya has been considered a member of the subfamily Laricoideae, closely related to Pseudotsuga and Larix, but more recent genetic studies have suggested a closer relationship to Pinus and Picea in the subfamily Pinoideae. A second species, C. nanchuanensis, is now treated as a synonym, as it does not differ from C. argyrophylla in any characters.

Cathaya is a genus in the pine family, Pinaceae, with one known living species, Cathaya argyrophylla. In foliage and cone morphology, Cathaya has been considered a member of the subfamily Laricoideae, closely related to Pseudotsuga and Larix, but more recent genetic studies have suggested a closer relationship to Pinus and Picea in the subfamily Pinoideae. A second species, C. nanchuanensis, is now treated as a synonym, as it does not differ from C. argyrophylla in any characters.

Torreya jackii (Chinese: 长叶榧树; pinyin: fěishù; lit. 'longleaf torreya') is a species of conifer in the family Taxaceae. Common names include Jack's nutmeg tree, longleaf torreya, Jack torreya, and weeping torreya. It is endemic to eastern China, in Zhejiang, Fujian, and Jiangxi provinces. It can be up to 12 metres (39 ft) tall. It is threatened by habitat loss and logging.

Quercus albicaulis is a rare Chinese species of oak. It is a tree found only on the island of Hainan in southern China. Quercus albicaulis is a large tree up to 30 m tall with white twigs and leaves as much as 18 cm long. It is placed in subgenus Cerris, section Cyclobalanopsis.

Ostrya rehderiana (Zhejiang hop-hornbeam, Chinese: 天目铁木; lit. 'Tianmu iron tree') is a tree in the Betulaceae family. It can grow up to 15 metres (49 ft) tall. It is endemic to Zhejiang province in China. The wild population apparently consists of only five trees on Tianmu Mountain, and the species is under first-class national protection in China.

Zenia is a genus of plants in the family Fabaceae. It belongs to the subfamily Dialioideae. It contains a single species, Zenia insignis. The Fabaceae family is known for their extraordinary ability to be efficient in symbiotic nitrogen-fixation. The Papilionoidea and Caesalpinioideae subfamilies have been found to be the two sister families that the Z. insignis seemed to diverge from, through the evidence of fossil calibration points. Based on genetic research, the Z. insignis appears to have lost the genes relating to key-nodulation during its evolution. This results in the tree's inability

Raphiocarpus is a genus of flowering plants belonging to the family Gesneriaceae. Its native range is southern China, Hainan, and Vietnam.

Quercus disciformis is a species of tree in the beech family. It has been found only in southern China, in the Provinces of Guangdong, Guangxi, Guizhou, Hainan, and Hunan. It is placed in subgenus Cerris, section Cyclobalanopsis. Quercus disciformis is a tree up to 14 meters tall with leaves as much as 14 cm long.

Quercus bella is an uncommon species of oak tree. It is native to Guangdong, Guangxi, Yunnan, and Hainan provinces of southern China and to northern Vietnam. It is placed in subgenus Cerris, section Cyclobalanopsis. Quercus bella is a tree up to 30 meters tall, with leaves as much as 15 cm long. It grows in humid hill and mountain forests from 200 to 1,172 metres elevation.

Quercus phanera is an uncommon Asian species of tree in the beech family. It has been found only in the Provinces of Guangxi and Hainan in southern China. It is placed in subgenus Cerris, section Cyclobalanopsis. Quercus phanera is a tree up to 25 meters tall. Twigs are grayish brown. Leaves can be as much as 15 cm long.

Quercus delicatula is an Asian species of trees in the beech family. It has been found only in southern China, in the Provinces of Guangdong, Guangxi, and Hunan. It is placed in subgenus Cerris, section Cyclobalanopsis. Quercus delicatula is a tree up to 20 meters tall with reddish-brown hairs covering the twigs and the undersides of the leaves, the leaves as much as 12 cm long.

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Hopea hainanensis is a species of tree in the family Dipterocarpaceae. It is found in Hainan Island of China and northern Vietnam. Hopea hainanensis produces the acetylcholinesterase inhibitor Hopeahainol A.

Goniothalamus chinensis is a species of plant in the Annonaceae family. It is found in China and Vietnam.

Garcinia paucinervis is a species of flowering plant in the family Clusiaceae. It is a tree found in China and Vietnam. It is threatened by habitat loss.

Begonia hainanensis, the Hainan begonia, is a species of flowering plant in the family Begoniaceae. It is a subshrub endemic to Hainan in southern China. It grows in forests and on mossy rocks.

Quercus tiaoloshanica is a species of oak. It is a tree endemic to the island of Hainan. It is native montane forests between 900 and 1,400 metres (3,000 and 4,600 ft) elevation. It is recorded from only three locations, but its population, habitat, and ecology are not well understood.

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Magnolia lotungensis (syn. Parakmeria lotungensis), the eastern joy lotus tree, is a species of flowering plant in the family Magnoliaceae, native to southern China, including Hainan. An androdioecious, hexaploid evergreen tree reaching 30 m (98 ft), it is typically found in forests from 700 to 1,400 m (2,300 to 4,600 ft) above sea level. It is used as a street tree in a number of southern Chinese cities. Due to its strength, easy maintenance, narrow growth habit with a rounded crown, and cold hardiness, it is showing promise as an ornamental tree in North America and Europe.

Madhuca hainanensis is a species of plant in the family Sapotaceae. It is endemic to China. It is threatened by habitat loss.

Machilus wangchiana (or Machilus wangchianus) is a tree of the Lauraceae family and is an avocado species endemic to China. It is native to Guizhou, Guangxi, and Guangdong provinces in southern China. It was described in 1953 by the botanist Woon Young Chun in 1953 and was published in Acta Phytotaxonomica Sinica. It has two synonyms; Persea wangchiana and Persea kadooriei which was described by the botanist André Joseph Guillaume Henri Kostermans in 1981 as published in Journal of South African Botany.

Cathayanthe biflora is a species of flowering plant belonging to the family Gesneriaceae. It is a perennial or rhizomatous geophyte native to Hainan and northern Vietnam. It is the sole species in genus Cathayanthe.

Callicarpa kwangtungensis is a species of beautyberry. The tree is introduced in Europe as an ornamental plant. The fruit is light-pink and grows in small clusters. The flowers can range from pink to white. It is endemic to China. The berries are very bitter and inedible for human use. Birds and other wild life won't eat them unless all their food sources are depleted.

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Amelanchier sinica, commonly known as the Chinese serviceberry, is a serviceberry native to China. Its fruit, a pome, is dark-blue when it ripens. Plants are found in Henan, Gansu, Shaanxi, Hubei, Sichuan provinces of China at elevations of 1000--2000 meters.

Alphonsea monogyna is a species of flowering plant in the Annonaceae family. It is a tree native to Guangxi, Hainan, and southern Yunnan in southern China and to northern Vietnam.

Alphonsea hainanensis is a species of flowering plant in the Annonaceae family. It is a tree native to Vietnam and to Yunnan, southwestern Guangxi, and Hainan in southern China. It is an evergreen tree which grows up to 20 meters tall. It is native to subtropical and tropical lowland evergreen broadleaf forests, where it grows on hillsides from 400 to 700 meters elevation. The species was first described by Elmer Drew Merrill and Woon Young Chun in 1940.

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Rehderodendron kwangtungense is a species of tree found in southern China. It belongs to the family Styracaceae, and it grows in forests at elevations between 100 and 1300 meters. The species is described based on a sample discovered in Ruyuan, Guangdong. Kwangtungense refers to it originating from Guangdong. Its common name in Hong Kong is literally called Guangdong red papaya (廣東木瓜紅), due to the fruit's shape resembling that of a papaya.