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A cross between A. cappadocicum and A. miyabei. A deciduous tree to 10 m. Bark grey to brown. Leaves, chartaceous, 8–20 × 10–20 cm, five- (seven) -lobed, the lobes ovate, the three central lobes with a single pair of broad teeth in the apical half, base deeply cordate, apically acuminate, glabrous below, except along main veins, margins entire to undulate; petiole glabrous or pubescent, slender, to 14 cm long, exuding a milky sap when broken; autumn colour yellow to golden brown. Inflorescence corymbose, erect, pubescent. Flowers yellowish green, 5-merous. Samaras with wings spreading at broad angles; nutlets flattened. (van Gelderen et al. 1994; le Hardÿ de Beaulieu 2003).
Habitat In cultivation only.
USDA Hardiness Zone 5
RHS Hardiness Rating H6
Conservation status Not evaluated (NE)
A. × hillieri was named by Roy Lancaster in 1979, who had identified a plant at the Hillier Nurseries that, dating from before 1935 and raised from seed of a tree of A. miyabei at Kew, was not true to that species. A visit to Hergest Croft, where similar seedlings were observed, raised from a specimen of A. miyabei which had A. cappadocicum ‘Aureum’ growing close by, confirmed A. cappadocicum as the pollen parent (Bean 1976). The Hillier plant was subsequently named ‘West Hill’, and the Hergest plant ‘Summergold’ (van Gelderen et al. 1994). The hybrid is intermediate between its parents and of ‘more moderate growth than A. cappadocicum’ (Bean 1988).