534 CONSERVATIVE ORGANS. [LECT. X. 



nips safe until the second leaf appears, or, in the 

 language of agriculture, until the plants come into 

 rough leaf'. 



The seminal leaves, in almost every instance, 

 are readily distinguished by their form, which al- 

 ways varies more or less from that of the proper 

 leaves; thus, in fig. 4 (page 532), a. shows the co- 

 tyledons changed into seminal leaves, b. b. are 

 the first proper leaves of the plant. A stem leaf 

 (f. caulinare), as the term implies, grows upon 

 the stem, and is attached to it either mediately, 

 or immediately by means of a petiole. A branch 

 leaf (f. rameum) is described as such only 

 when it differs from the leaves on the main stem 

 of the same plant, in which case it is requisite to 

 distinguish it from them ; as exemplified in purple 

 Cow-wheat, Melampyrum arvense. When stem 

 or branch leaves are seated on joints, they are 

 designated by the term articular (articulares) , 



Fig. 5. 



Fig. a ; and when situated close to or between the 



