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211 



(Medicago; Fr., Luzerne), whose flowers (figs. 174-179) resemble 

 those of the Clovers; but it differs in that its fruit is elongated 

 and sickle-shaped, or more or less spirally twisted (figs. 1 76-179), 



Medicago sativa (Lucerne). 



Fig. 174. 

 Flower (~). 



Fig. 175. 

 Longitudinal section of flower. 



The edges of the spiral may be smooth and unarmed (figs. 170, 177), 

 or spiny (figs. 178, 179), and the turns, at first pretty close together 



Medicago orbicularis (Snails). 



Iledicago ciliaris. 



ML 



W 



Fig. 176. 

 Side-view of Fruit. 



Fig. 177. 

 Front-view of fruit. 



Fig. 178. 

 Fruit. 



Fig. 170. 

 Fruit unrolled. 



(figs. 170—178)., may later become separated (fig. 179) under various 

 influences. 



Melilot (fig. 180) comes very near Medick, and has the same pin- 

 nately trifbliolate leaves; but the fruit is short and subglobular, 

 straight or scarcely curved ; it contains few seeds and opens later. 

 if at all, into two valves. In this series are three other genera. 



p 2 



