OX-EYE DAISY. 59: 
into a tube which surrounds the style (= syngenesious* 
cohesion), and to the base of which the slender filaments are 
attached. The ovary and style are almost 
similar to the Same parts in the ray-florets. 
In speaking of Indian Cress (p. 33), 
what is called protandry was referred to. 
We find in the disc-florets of daisies and 
many other composites the same mode of 
preventing self-fertilisation of the flowers. 
Examine with a good lens the stamens of 
an (as yet) unopened disc-floret, and you Fig. 102. Corolla of 
will find that the anther-cells unite to Se I eo 
form a tube (vide supra), into which all Creer ote 
; : open to show at- 
the pollen is discharged. At the bottom tachment of sta- 
of this tube the style is found, with its two mens. 
branches not yet separated. Notice that 
on each style-arm is a tuft of hairs. When the pollen has 
all been discharged into the staminal tube the style begins to 
elongate, and grows up through this tube, the hairs sweeping 
the pollen along in front of them. In florets which have just 
opened their corollas ycu will 
observe at the top of the sta- 
minal tube a little mass of pol- 
len-grains which have thus been 
thrust out. When finally the 
style has elongated quite out 
of the tube, and has driven all 
the pollen before it, its two “ Fe 
arms open outwards, and on the Me 108.) Diso- Hig. 204, Dise- 
a ; oret of Ox- floret of Ox- 
inner faces of these, two rows of eve Daisy— eye Daisy— 
minute papillae may be seen, ist stage. nd stage. 
which are the stigmatic surfaces. 
By this contrivance it is manifestly impossible for the pistils of 
one of these flowers to be fertilised by its own pollen; so that, 
indeed, while we say the floret is 3, it is so only in structure 
In its first stage it is g in function, and in its second ?. 
At the same time it must be remembered that, as there are 
tour or five hundred disc-florets crowded together, and as the 
outer rows open first, there is every apparent probability of 
the florets on one flower-head being fertilised by each other’s 
oan or by that from other flower-heads on the same 
plant. 
{a.) You may take for comparison with this type a great host of 
other plants which differ only in greater or less detail—e.g., Chamomiles 
(Anthemis and Matricaria), Corn Marigold and Feverfew (both belonging 
to Chrysanthemum), Yarrow or Milfoil (Achillea), Common Marigold 
* Gr. sun, together; genesis, birth. 
