496 



BOTANY. 



Order Amarantaceee. Herbs, rarely shrubs, whose flowers have a 

 ecarious perianth. The order, which contains about 500 species, is 

 mostly tropical, a few occurring in temperate climates, but none at all 

 in cold ones. 



In India some of the species are cultivated for their starchy seeds, 

 which are used for food. 



veral species are cultivated with us for their ornamental foliage, 

 (Achyranthes) or their colored inflorescence, e.g., 

 Cock's Comb (Celosia), Globe Amaranth (Gomphre- 

 na), etc. 



Amarantus retroflexus and A. albus, are common 

 weeds in fields ; the latter, in the prairie region, 

 grows in a globular form, and in the autumn breaks 

 off at the root, and is blown for miles across the 

 country. On account of this habit of growth it is called the " Tumble 

 Weed." 



Order Polygonaceae. The Buckwheat Family. Herbs, shrubs, or 

 rarely trees, mostly with sheathing stipules and knotted-jointed stems ; 

 perianth often petaloid. The 600 species constituting the order are 

 mostly natives of temperate regions. 



Ffigopyrum esculentum, Buckwheat, a native of Central or Northern 



FIGS. 412-16. IJLLUSTBATIONS OP FAGOPTBUM ESCULBNTUM. 



Fig. 411. Section 

 of seed of Chenopo- 

 dium. Magnified. 



Fie. 412. 



Fig. 412 Flower. Magnified. 

 Fig. 414. Pistil. Magnified. 



Fig. 413. Diagram of flower. 

 Fig. 415. Fruit Magnified. 



As'n, is now extensively grown in Europe and America for its nutri- 

 tious seeds, and for its honey-producing flowers (Figs. 412-15.) 



Polygonum amphibium, var. terrestre, a native of the United States, 

 has been used in the Mississippi valley as a substitute for bark in the 

 process of tanning. It contains a considerable quantity of tannin. 



RTieum officinale, Oriental Rhubarb, is a native of Southeastern 

 Asia ; its roots constitute the officinal Rhubarb. Other species are 

 often used as substitutes. 



