CHAPTER IV 



LIFE HISTORY OF AN ANGIOSPERM (ERYTHRONIU1VL 

 AMERICANUM) 



This attractive little plant, commonly called the Dog's Tooth . 

 Violet but related to the Lily, is found in the hollows of woods and 

 may be seen in flower during the month of April in the Middle 



FIG. 27. Dog's-tooth violet (Erythronium americanum) . Stages of 

 development from the seed. 15 show the stage of development in each of five 

 successive years k Pull explanation in the text. 6, Bulb showing a surface bud 

 (the sprout has been destroyed). (Gager After F. H. Blodgett.) 



Atlantic States. It consists of an underground stem bearing scales 

 (modified leaves) which is termed a bulb. From the lower surface 

 of the bulb are given off numerous slender rootlets which penetrate 

 the soil and from the upper surface, a pair of oblong lance-shaped 



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