88 INTRODUCTION TO BOTANY 
Fic. 71. A potato plant grown from the tuber, ten weeks old 
o, old tuber; s, stems on which young tubers are forming. One sixth natural size. 
The total space occupied by this plant is much more than two hundred times that 
occupied by the seedling plant of the same age (see fig. 70) 
are borne in considerable numbers along the stem, in the leaf 
axils, and may be found on the ground, rooting, in the late 
autumn and the following spring. Some of our common wild 
plants, including certain ferns, are propagated by bulblets. 
