Castanea mollissima

Chinese Chestnut
Scientific classification
Kingdom:	Plantae
(unranked):	Angiosperms
(unranked):	Eudicots
(unranked):	Rosids
Order:	Fagales
Family:	Fagaceae
Genus:	Castanea
Species:	C. mollissima
Binomial name
Castanea mollissima Blume

Castanea mollissima (Chinese Chestnut) is a member of the family Fagaceae, and a species of chestnut native to China.

Description

It is a deciduous tree growing to 20 m tall with a broad crown. The leaves are alternate, simple, 10–22 cm long and 4.5–8 cm broad, with a toothed margin. The flowers are produced in catkins 4–20 cm long, with the female flowers at the base of the catkin and males on the rest. The fruit is a densely spiny cupule 4–8 cm diameter, containing two or three glossy brown nuts; these are 2–3 cm diameter on wild trees. The scientific name mollissima derives from the softly downy shoots and young leaves.^[1][2]

Taxonomy

Synonyms:Castanea bungeana Blume; C. duclouxii Dode; C. fargesii Dode; C. formosana (Hayata) Hayata; C. hupehensis Dode; C. mollissima var. pendula X. Y. Zhou & Z. D. Zhou; C. sativa Miller var. formosana Hayata; C. sativa var. mollissima (Blume) Pampanini; C. vulgaris Lamarck var. yunnanensis Franchet.^[3]

In Vietnam, Chinese chestnut (Vietnamese language: hạt dẻ, Tày language: mác lịch) which are grown in Trùng Khánh district, Cao Bằng province (Castanea mollissima Bl.) have highest quality with 3,3-5,4% glucose, 43,36- 46,47% glucid, 1,16 – 2% lipid, 3,12 – 3,62% protein analyzed by Vietnam National Vegetable and Fruit Researching Institution in 1999.

Distribution and habitat

In the provinces of Anhui, Fujian, Gansu, Guangdong, Guangxi, Guizhou, Hebei, Henan, Hubei, Hunan, Jiangsu, Jiangxi, Liaoning, Nei Mongol, Qinghai, Shaanxi, Shandong, Shanxi, Sichuan, Xizang, Yunnan, and Zhejiang, and also to Taiwan and Korea. It grows close to sea level in the north of its range, and at altitudes of up to 2,800 m in the south of the range. The species prefers full sun and acidic, loamy soil, and has a medium growth rate.^[1][2]

Ecology

When cultivated close to other species of chestnut (including Japanese chestnut, C. crenata; American chestnut, C. dentata; and sweet chestnut, C. sativa), Chinese chestnut readily cross-pollinates with them to form hybrids.^[4]

Chinese chestnuts have evolved over a long period of time in coexistence with the bark fungal disease chestnut blight (Cryphonectria parasitica, formerly Endothia parasitica), and have evolved a very successful resistance to the blight, probably more so than any other species of chestnut, so that, although it is not immune, it typically sustains no more than minor damage when infected. This is in stark contrast to the American chestnut, which had no resistance to the blight, and was nearly wiped out by it after its introduction from Asia to North America. An active program has been pursued in North America to cross-breed the Chinese and American chestnuts to try to maximize various desirable traits of the American chestnut, such as larger stature, larger leaf size, larger nut size, and greater nut sweetness, while also isolating and carrying the blight resistance from the Chinese chestnut.^[5]

Uses

The nuts are edible, and the tree is widely cultivated in eastern Asia; over 300 cultivars have been selected for nut production, subdivided into five major regional groups: Northern, Yangtze River Valley, Sichuan and Guizhou, Southern and Southwestern. Besides that, the Dandong chestnut (belonging to the Japanese chestnut – Castanea crenata) is a major cultivar in Liaoning Province.^[6] Some cultivars, such as 'Kuling', 'Meiling', and 'Nanking', have large nuts up to 4 cm diameter. The nuts are sweet, and considered by some to have the best taste of any chestnut,^[7] though others state they are not as good as the American Chestnut.^[8] The nuts also provide a significant food source for wildlife.

Notes

1. ^ ^{a b} Flora of China: Castanea mollissima
2. ^ ^{a b} Flora of Taiwan: Castanea mollissima
3. ^ eFloras, 2009
4. ^ Sisco, P. H., et al. An Improved Genetic Map for Castanea mollissima / Castanea dentata and its Relationship to the Genetic Map of Castanea sativa. Acta Hort. 693. Abstract.
5. ^ FAO: Chestnut blight
6. ^ Economic forest trees.
7. ^ Biodiversity of China: Economic forest trees
8. ^ Castanea mollissima: Chines chestnut. By Edward F. Gilman and Dennis G. Watson. This is one of a series of documents from the Environmental Horticulture Department, Florida Cooperative Extension Service, Institute of Food and Agricultural Sciences, University of Florida. Original publication date November 1993. Revised December 2006.

References

• eFloras, Missouri Botanical Garden & Harvard University Herbaria (FOC Vol. 4 Page 316), Castanea mollissima, http://www.efloras.org/florataxon.aspx?flora_id=2&taxon_id=200006226, retrieved 2009