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Article from New Trees by John Grimshaw & Ross Bayton
'Sorbus wilsoniana' from the website Trees and Shrubs Online (treesandshrubsonline.
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Tree to 10 m. Branchlets thick and stiff. Buds large, ovoid and very sticky. Leaves to 25 cm long, with seven pairs of leaflets. Leaflets leathery, to ~8.3 cm long. Stipules large, leafy and persistent. Inflorescences large. Fruit subglobose, 0.8 × 0.8 cm, shiny crimson; carpels (three to) four to five. Sexual diploid (2n = 34). Lu & Spongberg 2003, McAllister 2005a. Distribution CHINA: Guangxi, Guizhou, western Hubei, Hunan, Jiangxi, western Sichuan, Yunnan. Habitat Mixed forests, between 1300 and 3300 m asl. USDA Hardiness Zone 7. Conservation status Not evaluated. Illustration NT814. Cross-references B426, K814.
Sorbus wilsoniana is very similar and closely related to the well-known and popular S. sargentiana, differing only in being slightly smaller in all parts, and having up to five carpels per fruit (three to four in S. sargentiana) (McAllister 2005a). It is an equally good garden tree, sharing its characteristic strong autumn colours and big orange clusters of fruits. It was introduced early in the twentieth century (though perhaps not by Wilson – Plantae Wilsonianae records that his collections were made of flowering specimens only: Sargent 1913); this stock seems, however, to have died out. It was reintroduced in 1985 through the Shanghai Botanic Garden seed list, the material having originated in Hunan (McAllister 2005a), and since then it has been collected on several other occasions, notably by expeditions to Sichuan (SICH 1233, 2100, 2215). Field notes indicate that it grows in mixed, rather open woodland over a range of altitudes, some of them quite low (SICH 2100, for example, was gathered at 1650 m in Tianquan Co. in 2001). The species is now quite widespread in cultivation, and freely available in the nursery trade.