Seeds and Their Germination. 



27 



Fig. 21. d. Tree 

 lupine as it appears 



ferminating in sand, 

 'he root hairs are 

 1 a d e u e d with sand. 

 b. Seedling of the 

 small-flowered lupine; 

 the first plumule leaf 

 on the left. c. Sprout- 

 ing seed of the dense- 

 flowered lupine, d. 

 The same after it has 

 been above ground 

 several weeks. 



Lupines 

 ordinarily 

 grow as repre- 

 sented in the 



cut at a and ^, but a common white-flowered 

 kind presents at the end of a month's 

 growth the queer appearance shown at d. 

 At first the sprouting seeds appear to be 

 like those of other lupines (c, Fig. 21), but 

 when the cotyledons open they are seen to 

 be united by their broad bases. For two or 

 three weeks the cotyledons enlarge; not 

 only becoming broader, but thicker; yet we 

 look in vain for a trace of the plumule. 

 Meanwhile a white pustule has been grow- 

 ing, which finally bursts and discloses the 

 partly grown leaves of the missing bud, 

 which has all this time been hidden in the 

 thick stem below the cotyledons. Now, c 

 the tough leathery skin of these cotyledons is proof 

 against the nightly frosts that prevail at this season 

 of the year (December), so they go on preparing 



