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A hybrid, intermediate in features between its parents T. americana and T. platyphyllos.
Habitat A hybrid found only in cultivation.
USDA Hardiness Zone 3-7
RHS Hardiness Rating H7
Hybrids of Tilia platyphyllos (Broad-leaved Lime) and T. americana (Basswood) are liable to occur whenever both species are grown together in areas with warm summers. The cross was first described in 1862 from a tree in the Vienna Botanic Garden (Pigott 2012). A very vigorous tree of 19 × 2.33 m in 2017 was apparently planted as T. × flaccida in 1957 in the Freundschaftsinsel Park, Potsdam, Germany (monumentaltrees.com 2018).
In addition to the cultivar described below, Heinze (2004) showed that trees with hybrid features such as rudimentary staminodes were widespread as younger plantings in Germany; at least some of these had been supplied under the name T. americana ‘Nova’ (q.v.). This might imply that ‘Nova’ belongs here, but does not preclude the possibility that those examples were wrongly named. We have not examined stock of ‘Nova’ for this account. Krüssmann (1984) describes ‘Diversifolia’ as a slender, upright tree with variably dissected leaves.