222 STUDY OF COMMON PLANTS. 



II. Compare the enchanter's-nightshade (^Circcea Luteti- 

 ana, L.), also in flower in midsummer, with the evening 

 primrose. 



1. Construct a diagram of the flower and observe how 



it differs from that of the latter species. 



2. Examine the flower under a lens and observe 



a. The conspicuous nectary. (Abundant nectar may 



also be found in some flowers.) 



b. The surface of the ovary. Can you suggest more 



than one use of the hooked bristles with which 

 it is covered ? 



3. Observe, if practicable, the way in which pollination 



takes place.-' 



III. A study of the cultivated Fuchsia may be made at 

 any time during several months of the year, and if more 

 convenient may be taken as the type instead of the even- 

 ing primrose. 



IV. Compare your observations of the various members 

 of the family that you have obtained for study, and note 

 the morphological characters common to them all. 



Note. — Since this exercise was written Professor C. F. Wheeler of 

 Michigan Agricultural College has reported the results of interesting 

 observations on the fertilization of the evening primrose by night-flying 

 moths. 2 



1 Cf. MOller, I.e., pp. 266, 267. 



2 Asa Gray Bulletin, No. 3, 1893. 



