CRUCIFER^ 329 



Cultivated Types of Cabbages. — A number of types have 

 arisen, probably as mutants, from the native wild cabbage. 

 The modifications concern the stem as in kohlrabi, the foliage 

 as in kale, head cabbage, and Brussels sprouts, and inflores- 

 cence, as in broccoli and cauliflower. The characteristic 

 differences between these are shown in the following key: 



Key to Cultivated Types of Cabbages 



Stem of first year elongated. 



Stem branched and leafy; plant much resembling wild cabbage (Fig. 135), 



B. oleracea var. viridis (kales and coUard). 

 Stem unbranched, the axillary buds developing into small heads (Fig. 136), 

 B. oleracea var. gemmifera (Brussels sprouts). 



Fig. 135. — Kale (Brassica oleracea Fig. 136. — Brussels sprouts (Brassica 

 viridis). (After Vilmorin.) oleracea gemmifera). 



Stem of first year short. 

 First-year stem forming a "head" (Fig. 137), B. oleracea var. capitata 



(common cabbage). 

 First-year stem not forming a "head." 



