216 AN INTRODUCTION 
Leaves oppofite or alternate are generally a 
Mark of great Difference in Plants: A few 
Genera however muft be excepted, which 
have fome Species with oppofite Leaves, and 
others with alternate; as in Euphorbia, 
Ciftus, Lantana, Antirrhinum, Lilium, and 
Epilobium. 
In Antirrhinum, Fafminum, Veronica and 
Borago, the lower Leaves at the Branches 
are oppofite, and the upper ones at the 
Flowers alternate. 
In Potentilla fupina, and in Potamogiton, 
the lower Leaves are alternate, and the up- 
per ones on the Branches oppofite. 
In Nerium the lower Leaves are oppo/ite, 
and the upper ones fern. 
In Rufcus the lower Leaves are tern, and 
the upper ones alternate. 
In Coreopfis alternifolia, and in Antirrbi- 
num chalepenfe, the lower Leaves are guatern, 
and the upper ones a/ternate. 
The zatural Situation of the Leaves in 
Plants that are much branched is beft con- 
cluded from the radical Leaves. 
CHAP, 
