ADVENTITIOUS LEAVES SCALES. 



167 



preserves its usual catkin-like shape, but the flowers 

 are replaced by little tufts of leaves. M. Germain de 

 Saint Pierre mentions a case wherein the flowers of 

 Alkma partiasslfoUa were Completely replaced by leaf- 

 buds.^ 



Here, also, may be mentioned the curious aggrega- 

 tions of scales which occur in some grasses, in Resti- 

 (icecBf JuncacecB, and other orders, in which the inflor- 



FiG. 79 Spikelets of 

 Wilhdenovia, composed 

 entirely of scales to the 

 exclusion of flowers. 



Fia. 80. Rose Willow, Salix. sp. 



' ' Bull. Soc. Bot. Fr.,' 1856, p. 53. 



