12 BULLETIIsr 428, U. S. DEPARTMENT OP AGRICULTURE. 



Beginning with the four citations given by Linnaeus, the outline 

 indicates the exact manner in which citations are made by various 

 authors, using the abbreviations just as they are found. In many 

 cases the same work is referred to in different ways, which is confus- 

 ing unless care is exercised in interpreting the abbreviations. A few 

 words of explanation regarding the outline may make it more easily 

 understood. 



Linnseus's first citation, it will be noted, is " Fl. suec. 620." In 

 this work are found five citations, the first being " Hort. Cliff, p. 377," 

 which in turn cites eight works, four of which were previously 

 cited in " Fl. suec," and the first one of which, " Riv. tetr.," makes 

 no further citation, as indicated by the footnote. The others that 

 are not previously cited are further elaborated until works are 

 reached in which no further citations are made. Those that are 

 previously cited are elaborated where they first appear, as, for in- 

 stance, " Bauh. hist. 2. p. 383," where it appears as a citation of the 

 " Fl. suec." instead of as a citation of " Dill, giss." The outline indi- 

 cates all the references to Medicdgo falcata that can be traced from 

 LinnaBus {JfO) as a starting point. 



An examination of the botanical descriptions contained in the 

 works listed in the outline shows very clearly that, while many of 

 the citations refer to true forms of Medicago falcata^ others refer to 

 hybrid plants and a few confuse Medicago falcata and Medicago 

 sativa. Following is a classification of the citations, with regard to 

 the plants to which they refer. 



Citations that refer to apparently true forms of Medicago falcata. 



Linnaeus (39)/Clusius {33, 34), Gesner (24), Tabernsemontanus (58), Kaspar 

 Bauhin (7), Johann Bauhin (6), Dillenius (20). 



Citations that refer to ichat are apparently hydrids Jyetween Medicago sativa 



and M. falcata. 



Kaspar Bauhin (8), Tournefort (60), Rivinus (50), Morison (U), Chabre 

 (15). 



Citations that contain only descriptions copied from other authors. 



Dalibard (17), Royen (52), Vaillant (63), Dillenius (19). 



Citation in which Medicago falcata and M. sativa are apparently confused. 



Linnseus (38). 



1 The numbers in italic type refer to " Literature cited," pp. 67-70. 



