28 AN INTRODUCTION 
and in the Plants of the Clafs Tetradyna- 
miat; or Perfffing, till the Fruit is come 
to Maturity, as in the Plants of the Clafs 
Didynamia ft, 
Variations of an INVOoLUCRUM. 
The preceding Varieties of the Calyx 
chiefly refpe&t a Perianthium. An IJnvo/y- 
crum is either Monophyllous, as in Bupleurum ; 
Diphyllous, as in Eupborbia ; Triphyllous, as 
in Butomus and Alifna; Tetraphyllous, as in 
Cornus; Pentaphyllous, as in Daucus; or 
Hexaphyllous, as in Hemanthus. 
Variations of a SPATHA. 
A Spatha is either Monophyllous, as in 
Nareifjus.; Diphyllous, as in Stratiotes; or 
Imbricate, as in Mujfa. 
CHAP. XIL. 
Of the different Structures of the COROLLA, 
HE Variations of the Corolla in re- 
fpe& to NUMBER concern either 
Petals, or Lacinia, Segments: The Varia- 
+ See PartII.Chap. 18. + See Part II, Chap. 17- 
tions 
