[773] Loudon's 'Arboretum et Fruticetum:' for Elm, see vol. iii. p. 1376; for Oak, p. 1846.
[774] 'Gardener's Chronicle,' 1849, p. 822.
[775] 'Arboretum et Fruticetum,' vol. iv. p. 2150.
[776] 'Gardener's Chron.,' 1852, p. 693.
[777] See 'Beiträge zur Kentniss Europäischer Pinus-arten von Dr. Christ: Flora, 1864.' He shows that in the Ober-Engadin P. sylvestris and montana are connected by intermediate links.
[778] 'Arboretum et Fruticetum,' vol. iv. pp. 2159 and 2189.
[779] Ibid., vol. ii. p. 830; Loudon's 'Gardener's Magazine,' vol. vi. 1830, p. 714.
[780] Loudon's 'Arboretum et Fruticetum,' vol. ii. p. 834.
[781] Loudon's 'Gardener's Mag.,' vol. ix. 1833, p. 123.
[782] Ibid., vol. xi. 1835, p. 503.