354 THE FERTILISATION OF FLOWERS. [parr 5 
266. Hizractum UMBELLATUM, L.—The florets have a 7 e 
3 to 5 mm., and an outer limb 8 to 16 mm. long, both increasing it 
length gradually from the centre to the periphery of the capitulum, mM. 
The whole capitulum, when fully expanded, forms a yellow disk 
about 25 mm. in diameter. q 
Honey is secreted by a ring round the base of the style, < 
rises several millimetres in the tube: ; a proboscis 2 to 3 mm. itil a 
' 
rs 
i 
5 
Fic, 116. 
1—8 —Hieracium umbellatum, L. 
1.—Floret, in second stage (x 7). 
2.—The stigmas, still more revolute, so that self-fertilisation takes place if the pouens has not — 
all been removed from the hairs. . J 
H 
8.—The portion a—b, of 1 (x 60). 
4. H. pilosella, L. Floret in the act of self-fertilisation (x 7). 
c, stigmatic papilla; d, sweeping hairs; e, pollen-grains; f, anther-cylinder; g, stamens 
h, style; i, tube of corolla ; k, limb of corolla ; 1, pappus ; m, ovary. 
suffices to reach it. Not only the two branches of the style (which | 
are 2} mm. long) protrude from the anther-cylinder, but also 
about 33 mm. of the style below its bifurcation; pollen rem ain 
adhering to the sharp, bristly hairs (3, d@) with which the whole o: 
the projecting part of the style is clothed. After emerging from 
the anther-cylinder, the two branches of the style, which 
