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- The elm cultivar Ulmus 'Crispa' [:'curled', the leaf margin], sometimes known as the Fernleaf Elm, arose before 1800 and was first listed by Willdenow as U. crispa (1809). Audibert listed an U. campestris Linn. 'Crispa', orme à feuilles crépues [:'frizzy-leaved elm'], in 1817, and an Ulmus urticaefolia [:'nettle-leaved elm'] in 1832; the latter is usually taken to be a synonym. Loudon considered the tree a variety of U. montana (1838). In the 19th century, Ulmus × hollandica cultivars, as well as those of Wych Elm, were often grouped under Ulmus montana. Elwes and Henry (1913) listed 'Crispa' as a form of wych elm, but made no mention of the non-wych samara (see 'Description'). Hanham (1857) noted that in his day concave-leaved Field Elm, U. campestris concavaefolia, was frequently mistaken for and sold as 'Crispa' in nurseries, "though there is a wide difference between them". The Louis van Houtte nursery used the synonym Ulmus campestris adiantifolia for 'Crispa', and Ulmus campestris crispa for the cultivar 'Webbiana'. The Baudriller nursery of Angers went one step further, listing Ulmus campestris adiantifolia, orme à feuilles de capillaire [:'downy-leaved elm'], separately from both Ulmus campestris crispa, orme à feuilles crispées [:'wrinkled leaved elm'] and Ulmus campestris webbiana, orme de Webb. Koch, noting similarities between 'Crispa' and Ulmus montana rugosa, conjectured (1872) that the latter cultivar, which has "similar but less frizzy leaves", may have arisen from the former. (en)
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- The elm cultivar Ulmus 'Crispa' [:'curled', the leaf margin], sometimes known as the Fernleaf Elm, arose before 1800 and was first listed by Willdenow as U. crispa (1809). Audibert listed an U. campestris Linn. 'Crispa', orme à feuilles crépues [:'frizzy-leaved elm'], in 1817, and an Ulmus urticaefolia [:'nettle-leaved elm'] in 1832; the latter is usually taken to be a synonym. Loudon considered the tree a variety of U. montana (1838). In the 19th century, Ulmus × hollandica cultivars, as well as those of Wych Elm, were often grouped under Ulmus montana. Elwes and Henry (1913) listed 'Crispa' as a form of wych elm, but made no mention of the non-wych samara (see 'Description'). (en)
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