502 



A TEXT-BOOK OF BOTANY. 



FIG. 278. Arethusa bulbosa, an Orchid growing in bogs from Newfoundland to South 

 Carolina, arid west to Minnesota. It produces a solitary magenta-crimson flower on a long, 

 slender scape, in the sheaths of which a solitary linear leaf arises and protrudes after the 

 flower opens. In the illustration are shown a number of plants, some of which show the 

 small bulbs at the base. After Troth. 



(2) the parts of the flower are usually in circles of 2 to 5 each; 



(3) the stems and roots generally increase in thickness by means of 

 a cambium, and the vascular bundles are open, varying from 



