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For the convenience of arrangement, metamorphosis of the parts of the flower may be divided into several subdivisions, according to the particular organ affected, and according to the special kind or degree of change manifested, the main subdivisions being here classed as Sepalody, Petalody, Staminody, and Pistillody.

Staminody of the bracts.—An instance of this has been already alluded to in Abies excelsa, as observed by Prof. Dickson, and in which some of the bracts were seen assuming the form and characteristic of the stamens see ante: p.

Staminody of the sepals and petals.—In the first named this is of very rare occurrence.

Staminody of the pistils.—The existence of this change has been denied by several authors, nevertheless, it is of sufficiently common occurrence.