THE CLASSIFICATION OF VEGETABLES 197 



other factors are considered. The system provides for 

 two general classes; namely, annual vegetables and 

 perennial vegetables. These classes are then divided in 

 subclasses according to the uses of the crops, and each 

 subclass is composed of groups, determined mainly by 

 their cultural requirements. The scheme of classification 

 proposed by Professor Bailey is as follows: 



CLASS I. ANNUAL VEGETABLES 



SUBCLASS I. CROPS GROWN FOR SUBTERRANEAN PARTS. 

 Group i. Root Crops. 



Beet (Beta vulgaris). 



Carrot (Daucus carota). 



Celeriac (Apium graveolens). 



Chicory (Cichorium intybus). 



Horse-radish* (Cochlearia armoracia). 



Parsnip (Pastinaca saliva). 



Radish (Raphanus sativus). 



Salsify (Tragopogon porrifolius). 



Turnip and Rutabaga (Brassica). 

 Group 2. Tuber Crops. 



Sweet potato (Ipomoea batatas). 

 Group 3. Bulb Crops. 



Cive or Chive (Allium schoenoprasum). 



Garlic (A. sativum). 



Leek (A. porrum). 



Onion (A. cepa, A. fistulosum). 



Shallot (A. ascalonicum). 



SUBCLASS II. CROPS GROWN FOR FOLIAGE PARTS. 

 Group 4. Cole Crops. 



Broccoli (Brassica oleracea). 



Brussels sprouts (B: oleracea). 



Cabbage (B. oleracea). 



Collard (B. oleracea). 



Cauliflower (B. oleracea). 



*Horse-radish and dandelion are perennials but usually occupy 

 the ground only one year. 



