[147] 'Gard. Chron.' 1852, p. 51.

[148] 'Flora.' 1858, pp. 32–42.

[149] 'Journ. Linn. Soc.,' vol. vi; "Botany," 1862, p. 24.

[150] 'Tijdschrift voor Natuur. Geschied,' 1836, vol. iii, tab. vii, p. 171.

[151] Rœper, 'Enum. Euphorb.,' p. 19. Bernhardi, 'Linnæa,' vii, p. 561, tab. xiv, f. 1. Wydler, "Subcotyled. sprossbildung," 'Flora,' 1850, p. 337. Hooker, 'Trans. Linn. Soc.,' vol. xxiv, p. 20 (Welwitschia).

[152] 'Misc. Austriac. ad Bot.,' vol. i, p. 133, t. 5.

[153] See also Carrière, 'Revue Horticole,' 1866, p. 442; and as to pears, Radlkofer in 'Bericht über die Thätigkert der Baierischen Gartenbau Gesellschaft,' 1862, p. 74, t. i.

[154] 'Flora Indica,' p. 23.

[155] 'Bull. Soc. Bot. Fr.,' 1856, p. 53.

[156] 'Trans. Linn. Soc.' xxvi, p. 142, tab. iv, B.