CRUCIFEROUS TRIBE. 39 



in a single row, on thread-like stalks. (Name from the 

 Greek cardia, the heart, and damao, to fortify, from its 

 supposed strengthening properties.) 



15. ARABIS (Rock Cress). Pod linear; valves flat, 

 obtuse, with one nerve or several veins; stigma nearly 

 sessile ; seeds in a single row. (Name from being 

 originally an Arabian genus.) 



1 6. TURRITIS (Tower Mustard). Pod linear, 2-edged ; 

 valves prominently nerved; seeds in two rows. (Name 

 from turris, a tower, either from its towering form, or 

 its usual place of growth.) 



17. BARBARE"A (Winter Cress). Pod linear, 4-angled; 

 valves with prominent nerve; seeds in a single row ; 

 calyx erect. (Name from St. Barbara, to whom it was 

 anciently dedicated.) 



18. NASTURTIUM (Cress). Pod nearly cylindrical, 

 short ; valves convex, nerveless ; seeds irregularly placed 

 in two rows ; calyx spreading. (Name from nasus tortus, 

 a distorted nose, on account of the pungent properties 

 of the plant.) 



19. SISYMBRIUM (Hedge Mustard). Pod rounded, or 

 angular ; valves convex, with three (or rarely one) 

 nerves ; stigma entire ; seeds in a single row, not striated ; 

 seed stalks slender. (Name, the Greek name of the plant.) 



20. ALLIARIA (Garlic Mustard). Pod long, linear, 

 rounded ; valves slightly 3-nerved ; seeds striated ; seed- 

 stalks flat. (Name from the Latin allium, garlic.) 



21. ERYSIMUM (Treacle Mustard). Pod 4-sided; valves 

 keeled ; stigma obtuse, entire, or notched ; seeds in a single 

 row, smooth, not margined. (Name from the Greek eruo, 

 to cure, on account of the supposed virtues of the plant.) 



22. CHEIRANTHUS (Wall Flower). Pod flattened; 

 valves with a prominent nerve ; stigma of two spreading 

 lobes ; calyx erect, two opposite sepals bulging at the 

 base. (Name of Arabic origin.) 



23. MATTHIOLA (Stock). Pod cylindrical, or flat- 

 tened ; stigma of two converging lobes ; seeds generally 

 with a membranous border. (Named in honour of Dr. 



Sj an Italian botanist.) 



