BRITISH FLORA. 
CLASS I. 
DICOTYLEDONOUS 1 , or EXOGENOUS, 
PLANTS. 
Cellular and vascular. Stem formed of two distinct 
portions, Wood and the former containing pith in 
the centre, from which diverge the medullary rays, and 
increasing by new layers on the outside ; the latter by 
new layers within. Leaves with the nerves much 
branched, and the veinlets reticulated. Flowers having 
the parts usually arranged in a quinary ( %/ or 5 n) or 
quaternary (.y or 4 n) manner. Embryo with two op- 
posite cotyledons, rarely more and then verticillate. 
Sub-Class I. THALAMIFLORiE. (Ord. 1.— XXIII.) 
Petals many, distinct, and, as well as the stamens, inserted upon 
the receptacle ( not upon the calyx ) ; hence hypogynous (from irtro, 
beneath, and yvvt], the pistil). 
Conspectus of the Orders. 2 
A. Flowers very irregular. 
a. Leaves with stipules, ovary 1 -celled. 
t). Violace.t;. Stamens 5 ; anthers with a crest, more or less cohering. 
Ovary with 3 parietal placentas. 
[26. Leguminos-e. Stamens 10, mono-diadelphous ; anthers distinct. 
Placenta 1, sutural.] 
1 From 3;?, twice, or double, and xim jAtibsiv, the cotyledon. 
2 The orders printed within brackets will be found described at length in some 
other sub-class, although some genera or species belong in character to the present 
one. On the other hand, the perigynous and apetalous genera and species trill be 
noticed in the conspectus of some other sub-class. A similar remark applies to all 
the sub-classes. 
B 
