FLOWERS, THEIR STRUCTURES AND KINDS 



157 



It has not elongated, and thus the members of the flower, which 

 belong to the same series of plant parts as the leaves, are very 

 much crowded. The pistils being in the center of the flower, 

 therefore stand highest upon 

 the stem, that is, at its apex. 

 All the other members of the 

 buttercup flowers are succes- 

 sively below the pistil and are 

 therefore said to be hypog- 

 ynous, i.e., underneath the 

 pistil. 



The Evening Primrose. 



((Enothera biennis=Onagra 

 biennis.) 



248. The flowers of the 

 evening primrose are formed 

 in a rather loose spike, which 

 continues to grow at the end, 

 producing new flowers in the 

 axils of the bracts, while the 

 seed is ripening in the lower 

 older fruit pods. In vigorous 

 plants flower spikes are also 

 formed on the branches in 

 the axils of the upper leaves. 



249. The calyx forms a 

 long tube, the lower part of 

 which is joined to (adnate) 

 the outside of the ovary. 

 This tube is prolonged far 



above the apex of the ovary and is about twice the length 

 of the young ovary. The free part of the tube is easily dis- 

 tinguished from the part adnate with the ovary by its light 

 green color. The calyx lobes are four in number, long, narrowly 



Fig. 114. 



Flower shoot of evening primrose ((Enothera 

 biennis). Flower buds at apex, opening flowers 

 next, and fruits forming below. Indeterminate 

 inflorescence. 



