Sorbus olivacea McAll.

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Credits

Article from New Trees, Ross Bayton & John Grimshaw

Recommended citation
'Sorbus olivacea' from the website Trees and Shrubs Online (treesandshrubsonline.org/articles/sorbus/sorbus-olivacea/). Accessed 2020-02-23.

Genus

Glossary

microspecies
Species distinguished on the basis of minute differences of morphology. Generally used only for species that reproduce via apomixis (e.g. Sorbus).
section
(sect.) Subdivision of a genus.
taxon
(pl. taxa) Group of organisms sharing the same taxonomic rank (family genus species infraspecific variety).

References

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Credits

Article from New Trees, Ross Bayton & John Grimshaw

Recommended citation
'Sorbus olivacea' from the website Trees and Shrubs Online (treesandshrubsonline.org/articles/sorbus/sorbus-olivacea/). Accessed 2020-02-23.

Tree to 10 m. Buds ~1.1 cm, red with reddish brown hairs on the margins and apices of the scales. Leaves whitish green, to 26 cm long, with five to six (to seven) pairs of leaflets. Leaflets to 6.3 × 2.3 cm, elliptic to oblong, slightly papillose beneath. Fruit hard, 0.7–0.8 × 0.7–0.9 cm, white flushed with pink or crimson in full sun; carpels (three to) five. Tetraploid apomict (2n = 68). McAllister 2005a. Distribution CHINA: Sichuan (Xichang Co.). Habitat Mountain forests. USDA Hardiness Zone 6. Conservation status Not evaluated. Illustration McAllister 2005a; NT808.

Sorbus olivacea is rather more distinct than other members of section Discolores, having unusually coloured leaves that make it quite conspicuous. The upper surfaces are a soft grey-green and the lower surfaces pale, so the whole tree has a pallid shimmer that will be greatly appreciated in the landscape as it becomes better known. The fruits are white, flushing pink or even red where exposed to the sun, and the tree at Ness, when leafless and covered in fruit, is extremely attractive illuminated by winter sunshine (H. McAllister, pers. comm. 2007). Like S. muliensis before it, it too is from Muli Co., Sichuan, having been collected at 2850 m there by the 1992 SICH team (Fliegner, Staniforth, Howick & McNamara: SICH 1162, as S. oligodonta). Under the number SICH 1482 (1994 expedition) is a similar taxon from Xichang Co., differing in minor details, which is another as yet unnamed apomictic microspecies (McAllister 2005a).


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