198 



BOTANY. 



being touched, is very common in moist ground everywhere 

 (Fig. 107, L-P). The garden balsam, or lady's slipper, is a 

 related species (J. balsamina). 



The second order ( Terebinthince) contains but few common 

 plants. There are six families, mostly inhabitants of the 

 warmer parts of the world. The best-known members of the 



Fio. 108. EucyclsB (Terebinthinse, ^Esculinse). A, leaves and flowers of 

 sugar-maple, Acer (Aceracese) , x % S, a male flower, x 2. C, diagram of a 

 perfect flower. D, fruit of the silver-maple, x %. E, section across the 

 seed, x 2. F, embryo removed from the seed, x 1. G, leaves and flowers of 

 bladder-nut, Staphylea (Sapindacese) , x %. H, section of a flower, x 2. /, 

 diagram of the flower. J, flower of buckeye (sEscidus), x 1%. K, flower 

 of smoke-tree, Rhus (Anacardiacese) , x 3. //, the same, in section. 



order are the orange, lemon, citron, and their allies. Of our 

 native plants the prickly ash (Zanthoxylum), and the various 

 species of sumach (Rhus), are the best known. In the latter 

 genus belong the poison ivy (R. toxicodendron) and the poison 

 dogwood (R. venenata). The Venetian sumach or smoke-tree 

 (R. Cotinus) is commonly planted for ornament. 



