176 



BRITISH FLOWERING PLANTS 



stigmas come into the fall line of the pollen. The 

 carpels are numerous, and terminate in a long feathery- 

 tail, which obviously serves to disseminate the seeds. 



Geum 



We have two species, one {G. rivale) with large 

 drooping dull-purplish flowers, and G. urhanum, with 

 small upright yellow flowers. Both have honey. The 

 arrangement is very similar to that of the preceding 

 genus (Dryas). 



G. urbanum is slightly protogynous. Besides the 

 complete flowers there are others, according to Schulz, 

 which are andromoncecious and androdioecious. The 



^ 



f^=^ 



Fig. 121. 



Fig. 122. 



Fig. 123. 



Fig. 124. 



Figs. 121-124. — Qeum urhanum. Fig. 121, yoitug style ; Fig. 122, older ; 

 Fig. 123, still older ; Fig. 124, rijie fruit. 



carpels are hairy, and terminate in a style which is 

 hairy in the middle and smooth at each end. Imme- 

 diately below the hairy tract a projection develops 

 (Figs. 122, 123), which gradually elongates and curves. 

 Finally, when the seed is ripe, the upper part of the style 

 detaches itself (Fig. 124), so that the fruit terminates in 

 a hook, which entangles itself in the hair of any passing 

 animal. It will be seen, however, from the arrangement 

 that the fruit cannot be torn away until it is ripe. In 

 other species the achene ends in a feathery tail as in 



