VI.] EXP LAN A TION OF FORMS OF LEA VES. 1 45 . 



them the general habit is also, as a rule, more or less 

 similar. Is this the case in genera where the various 

 species differ greatly in habit ? I have already 

 incidentally given cases which show that this is not 

 so, but let us take some group — for instance, the 

 genus Senecio, to which the common Groundsel 

 (Fig. 82) belongs, as a type well known to all of us 

 — and look at it a little more closely. 



The leaves of the common Groundsel I need not 

 describe, because they are familiar to us all. This 

 type occurs in various other species of more or less 

 similar habit. On the other hand, the fen Senecio 

 {S. paludosus) and the marsh Senecio {S. palustris), 

 which live in marshy and wet places, have long, narrow, 

 sword-shaped leaves, like those of so many other 

 plants which are found in such localities. The field 

 Senecio {S. campestris. Fig. 95), which lives in mea- 

 dows and pastures, has a small terminal head of 

 flowers springing from a rosette of leaves much like 

 those of a common Daisy {Bellis perennis) ; a 

 Madagascar species, as yet I believe unnamed, is 

 even more like a Daisy. Senecio junceus looks much 

 Hke a Rush; S. hypochcerideus of South Africa 

 strikingly resembles a Hypochasris, as its name denotes. 

 A considerable number of species attain to a larger 

 size and become woody, so as to form regular bushes ; 

 5. buxifolius has very much the general look of a 

 Box, 5. vagans of a Privet, 5. laurifolius of a Laurel, 

 ericcefolius of a Heath, pmi/ohus of a Fir, or rather, 

 a Yew. 



Again, some species are climbers ; S. scandens 

 and S, macroglossMS have leaves like a Bryony ; 



