200 STUDY OF COMMON PLANTS. 



XXXI. THE EVENING-PRIMROSE FAMILY. 

 ONAGRACEJE. 



MATERIAL REQUIRED. 



Evening primrose, CEnothera biennis, L., in flower. 



Fire-weed, Epilobium angwlifolium, L., Enchanter's-nightshade, Cir- 



ccea Lutetiana, L., and other representatives of the family, such 



as the cultivated Fuchsia. 



EVENING PRIMROSE. CEnothera biennis, L. 

 Distribution. 



Where were the specimens obtained? In what other 

 places in this country have you seen it growing? Does 

 it grow in any other parts of the world ? 1 



Flower. 



I. Examine the whorls in order and draw a diagram of 

 the flower. Cut a true longitudinal section, study care- 

 fully the relation of the parts, and draw. 



II. Note particularly the very long calyx-tube, insertion 

 of petals and stamens, the versatile anthers, elongated 

 style, and four thickened divisions of the stigma. 



III. Taking specimens past flowering, cut transverse 

 and longitudinal sections of the ovary, and observe under a 

 lens the number of rows of ovules in each cell, and their 

 form and direction. 



1 Cf. Lubbock, British Wild Flowers in Relation, to Insects, p. 93. 



