[1889] Dict. Fr.-Berbère, published by the French Government.
[1890] Linnæus, Species, p. 118; Lamarck, Dict. Enc., i. p. 431.
[1891] Phillips, Cult. Veget., ii. p. 4.
[1892] Munby, Catal. Alger., edit. 2, p. 36; Franchet and Savatier, Enum. Pl. Jap., ii. p. 175; Cosson, Fl. Paris, ii. p. 637; Bunge, Enum. Chin., p. 71, for the variety nuda.
[1893] Lamarck, Dict. Encycl., i. p. 331.
[1894] Viviani, Fl. Dalmat., i. p. 69; Host, Fl. Austr., i. p. 138; Neilreich, Fl. Wien., p. 85; Baumgarten, Enum. Transylv., iii. p. 259; Farkas, Fl. Croatica, p. 1277.
[1895] Bentham, Handbook of British Flora, edit. 4, p. 544.
[1896] The passages from Theophrastus, Cato, and others, are translated in Lenz, Botanik der Alten, p. 232.
[1897] Heer. Pflanzen der Pfahlbauten, p. 17.
[1898] Regazzoni. Riv. Arch. Prov. di Como, 1880, fasc. 7.