78 MORPHOLOGY. 
an added exponent, which denotes the number of the parts, for 
example, 2°, 
If a flower can be divided into two equal halves (reflex images) 
by several dissecting lines drawn through its central point, it is 
called regular or actinomorphous * (®) (Figs. 12 and 13). Such 
flowers, however, which can only be symmetrically divided by 
one section, are called monosymmetrical or zygomorphous* (A) 
(Figs. 11, 14, 15). 
If the only possible symmetrical section lies in the median 
plane (|), the flower is called median-zygomorphous (7), as 
in the Labiate and Papilionacer, otherwise oblique-zygomor- 
phous (A), as in Hyoscyamus, or transverse-zygomorphous 
(—>), as in Fumaria. Vf flowers can in no manner be symmetric- 
ally divided, they are called asymmetrical,’ as in the Zingiber- 
acez. 
The place where the bract accompanying the flower is located 
is represented in the diagram either below or in front. The 
first leaf of the flower is then located for the most part opposite 
the bract, either above or in the rear. 
Through subsequent inversion (resupination), the position of 
the flower to the bract is occasionally reversed. Thus the label- 
lum of an orchideous flower in its natural disposition is located 
in the rear and above, and only subsequently, through reversion 
of the ovary or of the peduncle, is brought forward and below. 
The individual flowers often combine to form the so-called 
inflorescence. According to the form of ramification, the fol- 
lowing are distinguished : 
___ IL Racemose Ixriorescence.—The main shoot (axis, rachis) 
is not over-topped by any of the lateral shoots produced thereon, 
in an acropetalous manner. 
f 1. Spike (spica). The flowers sessile on the axis 
Elongated { (Fig. 16 a) (Carex), to which belongs also: the 
axis. catkin (amentum), when pendulous and falling 
off as a whole (Juglans). 
1” Aurts ray, and zopp7 form. 
? Zuyov yoke, and opp form. 
* A privativum, and éUusuerpos symmetrical. 
