ADVENTITIOUS FLOWERS. 



175 



by Irmisch in the 13th volume of the ' Linnaea,' p. 124, 

 t. iv ; also by Professor Henslow, * Hooker's Journal 

 of Botany,' 1849, vol. i, p. 33, tabs. 2, 3. The lower 

 palea of this plant forms an inverted flower-bud upon 

 its midrib. In some fresh specimens which I have 



Fig. 89. Lip of outer palea 

 of Nepaul barley. 



Pig. 90. Supplementary rachil- 

 lus or outer palea of Nepaul bar- 

 ley bearing florets. 



Fig. 91. Diagram showing ar- 

 rangement of supplementary ra- 

 chiUus and florets. 



Fig. 92. Supplemental^ floret 

 of Nepaul barley ; palea removed. 



lately examined I find the structure to be as follows : 

 On each notch of the rachis there are three spikelets 

 (fig. 88), each one-flowered, and each provided with 

 two linear glumes ; the outer palea in all cases is three- 

 lobed at the summit, the central lobe being oblong and 

 hollow, forming a kind of hood (figs. 87-89), and covered 

 with hairs, which are directed downwards towards the 

 centre of the plant. The two lateral lobes are more 



