Yellow-horn (Xanthoceras sorbifolium Bunge), a valuable plant native to China, is a member of the family Sapindaceae. It is mainly distributed in North China, with a cultivation history of more than 1000 years (Ma et al., 2020). The species can be a tree or shrub, depending on the site conditions. Most trees are tall arbors with a round or spreading crown. Yellow-horn is characterized by a long period of blooming and a high number of flowers. The seed oil is highly valuable for cooking, and as a medicine and biofuel (Ruan et al., 2016; Shen et al., 2019). Yellow-horn is considered an ideal tree species with ecological, economic, and ornamental value. During recent years, yellow-horn has garnered attention and has been widely planted (Wang et al., 2019). Thirty-five varieties of yellow-horn have been certified by the National Forestry and Grassland Administration. ‘Yan Xia’ was successfully cultivated in July 2016. It can be grown in North China because of its cold- and drought-resistant nature. ‘Yan Xia’ has a greater number of petals than other varieties of yellow-horn. The color of petals changes throughout the blooming period. ‘Yan Xia’ is taller and has a longer florescence than other varieties; it has a crucial role in urban greening and gardening. Furthermore, the leaves and flowers of ‘Yan Xia’ can be used to produce tea. There are various medicinal components in the branches, leaves, and flowers of ‘Yan Xia’. The cultivar can also be cultivated to serve as a carbon sink, as well as for soil and water conservation.
Ao, Y. 2016a Characterization and comparison of flower bud microRNAs from yellow-horn species Genet. Mol. Res. 15 4 gmr.15048899 doi: 10.4238/gmr.15048899
Ao, Y. 2016b Comparison of floral ontogeny between wild-type yellow-horn (Xanthoceras sorbifolia Bunge) and its double-flowered mutant Bangladesh J. Bot. 45 2 511 512
Ma, Y.X., Bi, Q.X., Li, G.T., Liu, X.J., Fu, G.H., Zhao, Y. & Wang, L.B. 2020 Provenance variations in kernel oil content, fatty acid profile and biodiesel properties of Xanthoceras sorbifolium Bunge in northern China Ind. Crops Prod. 151 doi: 10.1016/j.indcrop.2020.112487
Ruan, C.J., Yan, R., Wang, B.X., Mopper, S., Guan, W.K. & Zhang, J. 2016 The importance of yellow horn (Xanthoceras sorbifolia) for restoration of arid habitats and production of bioactive seed oils Ecol. Eng. 99 504 512 doi: 10.1016/j.ecoleng.2016.11.073
Shen, Z., Zhang, K.Q., Ao, Y., Ma, L.Y. & Duan, J. 2019 Evaluation of biodiesel from Xanthoceras sorbifolia Bunge seed kernel oil from 13 areas in China J. For. Res. 30 3 511 512 doi: 10.1007/s11676-018-0683-9
Wang, X., Zheng, Y.Q., Su, S.C. & Ao, Y. 2019 Discovery and profiling of microRNAs at the critical period of sex differentiation in Xanthoceras sorbifolium Bunge Forests 10 12 1141 doi: 10.3390/f10121141