THE WALLFLOWER.- 17 
called tetradynamous.* Notice that the anthers, instead of 
being adnate, as in buttercup, are only attached to the 
filaments by a small point at the back near 
their base. The ovary bears a sessile stigma 
on its summit (there being no style), and, 
this is indistinctly 2-lobed, we are led to believe 
that the ovary is made up of two united carpels: 
this cohesion is termed syncarpous.! This 
impression is confirmed by making a transverse 
section through the ovary, when we find that it 
is 2-celled, being divided into two cavities by 
Fig. 9. Tetra- 
: ae dynamous 
a thin partition. The numerous ovules are Stcaeaes Of 
arranged along the walls on each side of the Wallflower. 
partition in two series. This is better seen 
by splitting off one of the valves which form the sides of the 
ovary, when you will notice that the ovules are arranged alter- 
nately along both walls. Now, the portion of an 
ovary bearmg the ovules is called the placenta, 
and the arrangement of the ovules is therefore 
their placentation: this kind in which they 
are arranged along the walls is said to be . 
parietal.} The division-walls of au ovary aL Hig 10, Trans- 
called septa§ or dissepiments ;|| but, as will ~ Versesection 
be explained later on (p. 55), the septum in the of ovary of 
ovary of wallflowerand similarplantsisconsidered — Watliflower 
to be a false dissepiment, and is ter oe areplum. — (™8s-): 
Each ovule has a short stalk (funiculus) directed down- 
wards. Remove one or more of the ovules and examine them 
carefully; the riper they are the more easily will their parts 
be made out. Hach is of an oblong much-compressed form, 
and with the testa pro oduced—chiefly at the lower margin— 
mto a thin white border or flange. On removing this 
testa you will find the ee to consist of a well- 
developed embryo without any albumen. You 
can usually get the aires ne easily by re- 
moving the testa a little at one end, and gently 
pressing from the other end with a needle. 
Notice that it consists of two nearly flat oblong 
ereen seed-leaves, or cotyledons, with a long % 
green radicle, or rudimentary root. Theradicle Fig. 11, Trans- 
while in the ovule lies along the edges of the verse section 
‘ of seed of 
cotyledons, and hence the latter are said to be = Watifower 
accumbent. (mag.). 
Ve Si en facie dunamis, power. 
+ Gr. sun, together ; karpos, the fruit. 
t Lat, paries, pariectis, a wall. 
§ Lat. septwim, a division. 
|| Lat. dissepto, I divide. 
bo 
