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 References:*Roth, Forest Bull. No. 10, pp. 11-23.Boulger, pp. 1-39.Sickles, pp. 11-20.Pinchot, Forest Bull. No. 24, I, pp. 11-24.Keeler, pp. 514-517.Curtis, pp. 62-85.Woodcraft, 15: 3, p. 90.Bitting, Wood Craft, 5: 76, 106, 144, 172, (June-Sept. 1906).Ward, pp. 1-38.Encyc. Brit., 11th Ed., "Plants," p. 741.Strasburger, pp. 120-144 and Part II, Sec. II.Snow, pp. 7-9, 183.

* For general bibliography, see p. 4.