498 CLASSIFICATION. 



The buckeye family (Hippocastanaceae) , including the horse- 

 chestnut (^sculus hippocastanum), much planted as a shade 

 tree along streets. Also there are several species of buckeye in 

 the same genus. 



The jewelweed family (Balsaminaceae) , including the touch- 

 me-not (Impatiens biflora and aurea) in moist places. The 

 garden balsam (Imp. balsamea) also belongs here. 



968. Order Rhamnales. Shrubs, vines, or small trees. There 

 are two families, the buckthorn (Rhamnaceae), the grape family 

 (Vitaceae), including the grapes (Vitis), the American ivy (Par- 

 thenocissus quinquefolia=Ampelopsis quinquefolia), in woods 

 and thickets, eastern North America, and much planted as a 

 trailer over porches. The Japanese ivy (P. tricuspidata=A. 

 veitchii) used as a trailer on the sides of buildings belongs 

 here. 



969. Order Malvales. Herbs, shrubs, or trees. 



The linden family (Tiliaceae). Example, the basswood or 

 American linden (Tilia americana.) 



The mallow family (Malvaceae), including the hollyhock, the 

 mallows, rose of Sharon (Hibiscus), etc. 



970. Order Parietales, with seven families in the eastern 

 United States. The St.-John's-wort (Hypericum) and the vio- 

 lets each represent a family. The violets (Violaceas) are well- 

 known flowers. 



971. Order Opuntiales. These include the cacti (Cactaceae), 

 chiefly growing in the dry or desert regions of America. 



972. Order Thymeleales, with two families and few 

 species. 



973. Order Myrtales. Land, marsh, or aquatic plants. 

 The most conspicuous are in the evening primrose family 

 (Onagraceae), including the fireweeds, or willow herbs (Epilobium), 

 and the evening primrose (Onagra biennis = (Enothera bien- 

 nis). 



974. Order Umbellales. Herbs, shrubs, or trees, flowers in 

 umbels. 



The ginseng family (Araliaceae). This includes the spikenards 



