Otf PLATES. 151 



PLATE 15. CONTINUED. 



A. The stamen-bearing- spike. 



b. One of the florets separated, consisting of a glume 



and 3 stamens. 

 C. The pistil-bearing" spikes. 

 d. One of the florets separated, consisting of a pistil 



constituted of a germen, two styles, and a glume 



which protects them. 

 It is also an example of the order Triandria, having three stamens. 



22. Dioecia, stamens and pistils in separate flow- 

 ers on separate plants of the same species 5 

 Willow, Salix. 



A. A stamen-bearing ament. 



b. A floret separated, consisting of two stamens pro- 

 tected by a scale. 

 C. A pistil-bearing ament. 

 d. One of the florets separated, consisting of a pistil 



protected by a scale. 

 It is also an example of the order Dianctria, having two stamens'. 



Fig. 23. Polygamia, stamens and pistils separate in 

 some flowers, united in others, either on 

 the same plant, or on two or three sepa- 

 rate ones of the same species ; Fig, Ficus. 



a. A stamen-bearing flower. 



b. A pistil. bearing flower. 



c. A perfect flower. 



It is likewise an example of the order Triacia, the three kinds 

 of flowers being on three different trees. 



24. Cryptogamia, stamens and pistils obscure. 



A. A a Fern, Polypod, Polypodium vulgaris. 

 b. The patches of fructification. 



C. Hair-cap Moss, Polytrichum. 



D. Scarlet Lichen, Lichen cocineus. 



The above are examples of three of the orders of Oyptogamia, 

 viz. Filices, Musci, and Hepaticae. 



Several of the 24 classes of Linnaeus have been abandoned by 

 several eminent botanists. The classes Polyadelphia and Polyga- 

 mia particularly have been rejected, and the plants distributed in 

 other classes. These are rejected in Eaton's *' Manual," which 

 is consequently arranged under 22 classes. 



