CH. XIII] 



THE DICOTYLEDONS 



549 



FIG. 394. Flower of 

 Locust ; X 2. 



In the characteristic 



legume, including Peas, Beans, Clover, 

 Cytisus, Judas Tree, Locusts, Labur- 

 num, Vetch, Wistaria, with the many 

 Acacias, and the Sensitive Plant. 



ORDER 17. GERANIALES: THE GERA- 

 NIUMS AND KIN. Another large and di- 

 versified assemblage, some 8000 species, 

 of trees, shrubs and herbs, forming a 

 continuous series from kinds related to papilionaceous corolla, 

 Resales, up to kinds which are highly Bright (the standard)! 

 specialized. They include the Gera- two are lateral (the 



-r, T - ^ v i ^ wings), and two are 



mums, Pelargoniums, Oxalis, and Gar- united be i w (the keel) 

 den Nasturtium (Tropceolum) ; the Flax, enclosing the stamens 

 yielding the cortical fibers from which 

 linen is made, and Linseed oil ; the Oranges, Lemons, and 

 Grape Fruits; while here belong the plants producing 

 Cocaine, and also Mahogany. Most specialized are the 

 Euphorbiaceae, of which the apparent single blossoms are 

 really clusters with colored bracts surrounding reduced 

 staminate and pistillate flowers (Fig. 395). Some of the 

 Euphorbias live in deserts and resemble Cacti, from which 

 they differ in possessing a milky juice, 

 and in the fact that their spines are 

 either paired (stipules) or single (axillary 

 flower branch) instead of a cluster. 

 They include also the highly ornamental 

 Poinsettia, the Castor Bean, and some 

 others of medicinal value, with a few 

 rubber-producing plants. 



FIG. 395. A typical 

 compound flower of a 

 Euphorbia, showing the 

 parts. (From Cavers.) 



ORDER 18. SAPINDALES : THE MAPLES 

 AND KIN. About 2500 species, chiefly 

 shrubs and trees, obviously related to 

 Geraniales. They include the Box, Mango, Crowberries 

 (low creeping heather-like plants of barren hills), the Hollies, 

 Poison Ivy and Sumach, Smokebush, and climbing Bitter- 



