CHAP. II. 1 EMPETRE^. 433 



duced on long thick anthers, and each consists 

 of a scale-Hke calyx enclosing numerous stamens ; 

 the female flowers are two or more together, 

 and each consists of a scale-like calyx, enclosing a 

 one-celled ovary. The fruit is a drupe, that is, 

 it consists of a fleshy husk enclosing a nut. 

 The embryo fills the whole seed ; and the co- 

 tyledons are fleshy, two-lobed, and wrinkled. 

 There are only two genera, the Walnut {Ju- 

 glans), the male catkins of which are produced 

 singly, and the Hickory {Caryct)^ the male 

 catkins of wdiich are in clusters. 



ORDER CLXXIV.— AxMEXTACE^.— (See Chap. XI. 

 P. 174). 



The male flow^ers are in catkins, and the fruit 

 of most of the genera is, when ripe, partially 

 or wholly enclosed in a cup -like involucre, 

 formed by the adhesion of the numerous bracts. 



ORDER CLXXV.— HA:\IAMELIDE^. 



This order has been already inserted, p. 880. 



ORDER CLXXVL— EMPETREiE. 



Little heath-like plants, with small flowers 

 and showy berries. The Crowberry, Empetrum 

 nigrum^ is very common in Scotland on heaths. 



