1 BULLETIN 428, U. S. DEPARTMENT OF AGRICULTURE. 
Beginning with the four citations given by Linneus, 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. 
Linnezeus’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 M/edicago falcata that can be traced from 
Linneus (40) 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 d/edicago falcata, others refer to 
hybrid plants and a few confuse Medicago falcata and Medicago 
sativa. Following is a classification of the citations, with wegie to 
the plants to which they refer. 
Citations that refer to apparently true forms of Medicago falcata. 
Linneus (39),* Clusius (33, 34), Gesner (24), Tabernemontanus (58), Kaspar 
Bauhin (7), Johann Bauhin (6), Dillenius (20). 
Citations that refer to what are apparently hybrids between Medicage sativa 
and M. falcata. 
Kaspar Bauhin (8), Tournefort (60), Rivinus (50), Morison (44), Chabré 
(SLE 
Citations that contain only descriptions copied from other authors. 
Dalibard (17), Royen (52), Vaillant (63), Dillenius (J9). 
Citation in which Medicago falcata and M. sativa are apparently confused. 
Linneeus (38). 
1The numbers in italic type refer to ‘‘ Literature cited,” pp. 67-70. 
