MONOCHLAMYDE^, 



649 



Fiy. 1016. 



Fig. 1017. 



Fig. 1016. Amentum of the Walnut tree (Juglans recrla), consisting of 



stamiuate flowers separated by scaly bracts Fig. J017. Seed of the 



above. 



is also esteemed for its timber. J. alba, tha White Walnut or Butter-nut, is 

 another useful timber tree. The inner bark of its root is used in the United 

 States as a mild purgative. The seed is edible. 



Carya.— Carya ulba\s, the common Hickory, valuable for its timber, and for 

 its edible seeds, which are commonly known as Hickory Nuts. C. olivceformis 

 yields an olive-shaped or elliptical nut, which resembles the Walnut and 

 Hickory in flavour, and is known as the Peccan Nut. t*. porciria yields an 

 edible nut termed the Hog Nut. 



Natural Order 229. Coktlace.e or Cuphlifee.^. — The Oak 

 or Mastwort Order {figs. 101 8 — 1020). — Trees or shrubs. Leaves 

 {fig. 191) alternate, usually feather- veined, simple, with deci- 

 duous stipules. Flowers moncecious. Male flowers {fig. 1018), 

 clustered, or in amenta {fig. 374) ; stamens 5—20 (fig. 1018), 

 inserted i?ito the base of a membranous valvate calyx, or of 

 scales. Female flowers {fig. 1019) solitary or clustered, and 



Fig. 1018. 



Fig. 1019. 



Fig. 1020. 



Fig. 1018. Male flower of a species of Oak (Quercus) Fig. 1019. Female 



flower of the same. Fig. 1020. Transverse section of the latter. 



surrounded by an involucre of bracts {fig. 1019), which ulti- 

 mately form a cupule {figs. 377 and 378) round the ovary and 



