172 ADVENTITIOUS LEAF-BUDS. [BOOK i. 



the individual as well as the species, the embryo continues 

 the species,, and not the individual. 



The usual, or normal, situation of leaf-buds is in the axil of 

 leaves ; and all departure from this position is either irregular 

 or accidental. Botanists give them the name of regular 

 when they are placed in their normal station, and they call 

 all others latent or adventitious. The latter have been found 

 in almost every part of plants j the roots, the internodes, the 

 petiole, the leaf, the flower itself, have all been remarked pro- 

 ducing them. On the leaf they usually proceed from the 

 margin, as in Malaxis paludosa, where they form minute 

 granulations, first determined to be buds by Henslow, or as 

 in Bryophyllum calycinum and Tellima grandiflora ; but they 

 have been seen by Turpin (fig. 19.) proceeding from the 

 surface of the leaf of Ornithogalum. (Fig. 20, represents a 

 vertical section of one of these buds.) 



19 



M. Naudin, in the Annales des Sciences Nat. vol. xiv. p. 14. 

 describes some small plants of Drosera anglica, which were 

 produced on a leaf on the upper side. They sprang from the 

 cellular tissue, between the midrib and lateral veins near the 

 edge, and were stationed about a line and a half apart. 

 They were from five to six lines in length, and had, it would 

 seem, a stem with alternate leaves, notwithstanding that the 

 Drosera in its natural state is stemless, and only provided 

 with root leaves. Nothing could be observed on the under 

 side of the parent leaf, except a black spot below one of the 

 two stems ; there were no roots. The stems issued from the 

 naked cellular tissue, and had no connexion with the vessels of 



