56 AN INTRODUCTION 
Margin differing in Sex from thofe of the 
Difk, as in Afrantia, Caucalis, Artedia, Oe= 
nanthe and Scandix. The Involucrum varies, 
in being either Tetrapbyllous, of four Leaves, 
asin Hydrocotyle, Sifon, and Cuminum ; Pen- 
tapbyllous, of five, as in Bupleurum, Scandix, 
and Bubon; Heptaphyllous, of feven, as in Li- 
gufticum ; Decaphyllous, of ten, asin Artedia: 
With the partial Involucrum dimidiate, halved, 
going but half round, as in Athu/a, Cortan- 
drum, and Sanicula ; or Caducous, fa-ling off; 
as in Ferula and Heracleum, 
4. A CYMOSE Flower is an aggregate 
one, of many Florets, placed ona Recepta- 
cle upon faftigiate * Peduncles, the primary 
ones of which iffue from the fame Centre 
as in an Umbel ; but the fecondary, or par= 
tial ones, lie difperfed without Order ; 
which Circumftance diftinguifhes the Cyma 
from the Umbel, asin Opulus, Ophiorrhiza, 
and the Species of Cornus called Virga fan- 
guinea, or Bloody-rod. 
5. An AMENTACEOUS aggregate 
Flower has a Filiform, Thread-/haped Re- 
ceptacle, along which are difpofed amenta- 
cequs Squame, Scales thatform an Amentum 
or Cathkin, as in Xanthium, Ambrofia, Par- 
* See the firft Note on Chap. 8. 
thenium, 
