AN INTRODUCTION 



CHAP. XVI. 

 OF FOLIATION". 



BY FOLIATION is to be understood the compli- 

 cate or folded state the leaves are in, whilst they 

 remain concealed within the buds of the plant*. 

 Leaves, in respect to the manner of their complica- 

 tion, are either, 



INVOLUTE, rolled in ; when their lateral margins 

 are rolled spirally inwards on both sides ; as in Lo- 

 nicera, Diervilla, Euonymus, llharanus catharticus, 

 Pyrus Malus, Populus, Plumbago, Viola, Cominelina 

 amiua. Piantago, Alisma, Potamogeton natans, Nym- 

 phaea, Saururus, Aster animus, Humulus, Urtica, 

 Hepatica, Sambucus, Ebulus, and Staphylea. 



REVOLUTE, rolled back; when their lateral mar- 

 gins are rolled spirally backwards on both sides ; as 

 in Rosmarinus, Teucrium marum, Dracocephalon, 

 Digitalis, Nerium, Andromeda, Ledum, Epilobium 

 angustifolium, Rumex, Persicaria, Pplygoiium, Pa~ 

 rietaria, Primula, Carduus, Cnicus, Tussilago, Se-> 

 necio, Othonna, Potentilla fruticosa, Ptelea, and 

 some species of Salix. 



OB VOLUTE, rolled against each other; when their 

 respective margins alternately embrace the strait 

 margin of the opposite leaf; as in Dianthus, Lychnis, 

 Saponaria, Epilobium oppositif. Dipsacus, Scabiosa, 

 Yaieriana, Marrubium, Phlomis, Salvia, and Prasiurn. 



C ON VOLUTE, rolled together; wiien the margin of 

 one side surrounds the other marmn of the same leaf, 



* Lintiacus claims the invention of the distinctions given in 

 this chapter, preceding Botanists, not having (as he says) at- 

 tended to the foliation in budjj. 



