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Article from New Trees by John Grimshaw & Ross Bayton
'Sorbus takhtajanii' from the website Trees and Shrubs Online (treesandshrubsonline.
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Tree to 7 m. Branchlets smooth, glabrous, with a few lenticels. Buds hairy, 0.5–0.7 cm long. Leaves 6.5–8.5 × 4.5–5.5 cm, rhombic to elliptical, upper surface glabrous, lower surface white-tomentose, six to seven secondary veins on each side of the midrib, craspedodromous, margins lobed, apex acute; petiole 1.5–2 cm long, pubescent. Inflorescence corymbose and pubescent. Flowers white, hermaphrodite; hypanthium shallowly turbinate, sepals acute and persistent, petals 0.5 cm long. Fruit orange or reddish, 1.1–1.2 × 0.9–1.1 cm, covered with lenticels. Flowering May to July, fruiting August to September (wild plants). Aldasoro et al. 2004. Distribution ARMENIA; AZERBAIJAN; IRAN; TURKEY. Habitat Mountain slopes and forest margins, between 1200 and 2200 m asl. USDA Hardiness Zone 5–6. Conservation status Not evaluated. Illustration More & White 2003.
Sorbus takhtajanii is represented in several British arboreta and is reasonably distinct on account of its dark green leaves with a bright white underside. The leaves are strongly toothed in their upper half. It is one of the Armenian species whose introduction is described above. All of them have proved to be relatively slow-growing, having champions of no more than 4–5 m (TROBI) as yet.