222 



LESSONS WITH PLANTS 



a colleetion of flowers for this study could be easily secured 

 in winter time. Even without previous notice, he might be able 

 to supply carnations, violets, fuchsias, heliotropes, geraniums, 

 begonias, alyssum, hyacinths, roses, freesias, oxalises, bouvardias, 

 lilies-of-the-valley, mignonette, pansies, chrysanthemums, cinerarias. 



XLI. PARTICULAR TYPES OF FLOWERS, 

 CONTINUED. (THE ORCHIDS) 



254. A lady's-slipper, or cypripedium, is shown 

 in Fig. 213. The flower is exceedingly irregular. 



There are four obvious petal- 

 like parts, a a b d, and a sac 

 (or "slipper") c, which is no 

 doubt a part of the peri- 

 anth. This makes only five 

 parts. A study of homolo- 

 gies in other cypripediums, 

 however, shows that the lower 

 member, d, represents two 

 united parts, and we must 

 believe that the flower is 

 trimerous. The three parts 

 standing for the calyx are 

 the outermost ones, repre- 

 sented by the united parts, d, and the upper one 

 at a. The parts representing petals, then, are the 

 side pieces a and b, and the sac c. 



Fig. 214. 



Column of a greenhouse 

 cypripedium. 



