Fig. 20. Tamus communis (a) (Black Brioiiy), Asparagus qfficinalis 

 (b, c), (Asparagus) and Avena sativa (d, e), (Oat); embryos 

 showing two cotyledons, (a) The second cotyledon acts as 

 an absorbing organ, remaining within the endosperm ; (b) the 

 embryo with two cotyledons ; (c) diagram showing two 

 cotyledons and the first pair of leaves, at right angles to the 

 former; (d) embryo showing the second cotyledon (lobule); 

 (c) lobule removed. (See p. 94.) 



[To face page 90. 



