explanation of tiie plates.

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or commencement of the leaves'. These glands form a part of Lin-nams’s specifick character of this species of Passiflora, which he thusdefines: ‘ £ P. foliis serratis aequalibus : petiolis biglaudulosis.”—D. I).Cirri , tendrils, or eiaspers. E. The five-leaved calyx (perianthiumpcntuphtjUiim), coloured, and resembling petals, e. Glands, near tin}base of the flowers. F. One of the five petals of the corolla, whichterminate obtusely and not in points, as do the leaves of the calyx.O. The nectary ( nectariam ), which is said u to crown the corolla.”(See Part I, p. 93.) II. The three styles. I. The germe, with thestamens below. The stamens are five in number, but only four of themare visible ;n this drawing.—Limneus arranges this plant in the orderPentandria of the class Gynandria. By others, it is thrown into theclass Pentandria, and the order Trigynia; and by others again into theorder Pentandria of the class Monadelphia.

PLATE XXVI.

Cuiomv, pentaphylla. The genus Cleome is arranged, by Linnams,in the class Tetradyuamia, but the species which is here figured, isCertainly not a Tetradynamous plant. A. A. The compound leaves(folia composita), which are quinate or digitate ( folium quinalum, s.digitaluw). a. a. a. a. a. The sessile leaflets j folia scssiha). B. B.Peduncles (pediaiculi) , supporting the pericarps, C. 0., which arecliques. ID. D. Perianths, which consist of four leaves (calyx tetra-phi/llus ) , from wdiich arise the four petals, the claws ( ungues) of whichare very long, and linear. E. The six stamens of a fertile flower.I - The germe. G . The germe of an abortive .flower. II. II. The sixstamens. I. The corymb ( corymbus } of flowers,.—This plate mayserve to illustrate the order Ilexandria, of the class Gynandria.

PLATE XXVII.

Fig. 1. Betula popnlifolia, a native of Pennsylvania , and otner partsof the United States . A. A. The male ament, or catkin (amentum).B. B. The female flowers. C. C. Receptacles, such as support themale flowers.

Fjg. 2. A portion of the Virginian Polypody, or Male-Fern .This is a true dorsiferous Fern , the fructification being fastened upon theback of the frond. {See Part III, Class Cryptogamia, page 312.)

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