[4] De Candolle, Alphonse Or. Cult. Plants 228. 1885.
[5] Chinese Literature, Edited by Epiphanius Wilson Bk. I:126. 1902.
[6] Ibid. Bk. IX:148, 149. 1902.
[7] Ibid. Bk. XIII:161. 1902.
[8] Cibot, Pierre Martial Mém. concernant l'hist. les sciences etc. des Chinois. II:280-293. 1777.
[9] U. S. D. A. Plant Immigrants. No. 102:823-825. 1914.
[10] Knight Thomas Andrew Trans. Hort. Soc. Lond. 3:1. 1820.
[11] Gard. Chron. 531. 1856.
[12] Gard. Chron. 27. 1863.
[13] Darwin Ans. and Pls. Domest. 1:357. 1868.