56 



URTICIFLOR^E 



[CH. 



enclosed by the papery or membranous perianth-lobes 

 (e.g. Nettle), which however may become fleshy (e.g. Urera, 

 &c.) In other cases (e.g. Villebrunea, Fig. 64) the bracts 

 are fleshy and enclose the achenes. In the Hop (Fig. 65) 



Fig. 65. Humulus Lupulus. 1, branch with male inflorescence; 2, 

 branch with female inflorescences ; 3, female inflorescence ; 4, two 

 female flowers with bract ; 5, infructescence ; 6, fruit (Wo). 



the achenes are in the axils of the large bracts of the 

 "cones." In Memorialis, and in the Elms (Fig. 66), &c. 

 the achene has wings and is a Samara, the pericarp of 



