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Article from New Trees by John Grimshaw & Ross Bayton
'Sorbus rinzenii' from the website Trees and Shrubs Online (treesandshrubsonline.
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Tree to 6 m. Branchlets 1.5–2.5 mm on extension shoots, to 4 mm on fruiting spurs. Leaves 9–19 3–5 cm, with (9–)11–14 pairs of leaflets. Leaflets to 3 0.7 cm, oblong, apex rounded, margins serrate with acuminate teeth in upper two-thirds, white-pilose. Stipules foliaceous, oblong, serrate on outer margin, 11 3.5 mm on flowering shoots, persisting. Flowers white. Fruit globose, 8.5–12 7–9 mm, ripening white or pink, fading to white; carpels four to five. Sexual diploid. Rushforth 1991. Distribution BHUTAN; INDIA: northern Sikkim; NEPAL: eastern. Habitat Mountain forests, c.4000 m asl. USDA Hardiness Zone 6. Conservation status Not evaluated.
Sorbus rinzenii is a small tree in the S. microphylla alliance. It shares many characteristics with S. rufopilosa, including being a sexual diploid, but is larger in all parts, with large persistent stipules and leaflets up to 3 cm long that are toothed to more than half their length (McAllister 2005a). It comes from the drier area of northwestern Bhutan, where it was collected by Keith Rushforth in 1985, and also occurs in northern Sikkim and eastern Nepal at c.4000 m, from where it was introduced by the Kew-Edinburgh-Kanchenjunga Expedition in 1989 (KEKE 627). It tolerates drier conditions than S. rufopilosa, and is more widely grown.