26o THE SEED PLANTS : FORMS AND LIFE HISTORIES 



Fig. 41. — A, youngplant of the Field Bindweed (Convolvulus arvensis), 

 showing the thin white underground shoots {rh.) which ramify deeply 

 in the soil and make the plant a troublesome weed. B, hori- 

 zontally growing rhizome of a grass. C, plant of the Chickweed 

 Wintergreen {TrientaUs) which has arisen from the tuber (i"). The 

 new tuber (<') has arisen at the end of the rhizome, rh., rhizomes ; 

 r, adventitious roots ; sc.l., scale leaves; a.*., aerial shoots. (After 

 Warming.) 



