272 



DICO T YLED ONS. 



in fig. 357, small yellow tubers resembling grains of corn. The leaves are 

 compound, and the lobes are finely dissected. The flower scape bears a 

 slender raceme of curious pendulous, greenish-white flowers, sometimes tinged 

 with rose color. The details are shown in the figure. The stamens are six 

 in number, arranged in two groups of three (being in two groups they are 

 diadelphous). 



525. Lesson VIII. The mustard family (cruciferse) . — This 

 is well represented by the toothwort 

 (dentaria), which we studied in a former 

 chapter. 



These three families (poppy, fumitory, 

 and mustard) are closely related as shown 

 by the regular flowers, which are usually in 

 twos (dimerous) or in fours (tetramerous). 



Fig- 358. 

 Diagram of cruciferous 

 flower. 



GRUINALES. 



527. Lesson IX. The gera- 

 nium family (geraniacese). 

 — The wild cranesbill has a 

 perennial underground root- 

 stock. From this in the 

 spring arises the branched, 

 hairy stem 



deeply parted into about five wedge-shaped lobes, which are 

 again cut. The peduncles bear several purple flowers (fig. 359). 

 The floral formula is as follows : Ca5,Co5,Aio,G5. The wood- 

 sorrel (oxalis), the balsam or jewelweed (impatiens), sometimes 

 called ' ' touch-me-not, ' ' are members of the same family. 



Fig- 359- 

 Branch of cranesbill (Geranium maculatum)* 

 I he leaves are showing upper leaves, flowers, and pods. 



