386 



CRUCIFER^ 



A. 



1 6. Table of the Chief Distinctions between the 

 Common Species of Brassica. 



Sepals erect or nearly so (Fig. 121). 

 i. Leaves of 1st year's plant glaucous (ashy grey). 



a. All leaves smooth, flowers pale lemon 

 yellow. Cabbage. 



b. First leaves of seedling with a few 

 stiff hairs, flowers buff, or pale 

 yellow. Swede and swede-like 

 ' Rape.' 



™ ii. Leaves of 1st year's plant grass-green 

 Fig. 121.— Flower .„,.'„ '^ , . , ^ ,, 



of cabbage, showing with stiff hairs, flowers bright yellow, 



erect sepals, s. Tumlp and tumip-like Rape. 



Fig. 122. — Flower 

 of charlock, showing 

 spreading sepals, J. 



B. Sepals spreading (Fig. 122). 



i. Siliques erect, closely pressed to main axis on which they grow : 



valve of silique with one nerve. Black Kustard. 

 ii. Siliques spreading, valve of silique with three nerves. 



a. Silique with sword-like 'beak,' seeds pale yellow or straw- 

 colour. White Mustard. 

 b. Silique with cylindrical straight 

 beak, seeds dark-brown. Char- 

 lock. 



17. Wild Radish: Jointed Charlock 

 {Raphanus Raphanistrum L.). — An 

 annual weed common and troublesome 

 in cornfields in many districts although 

 unknown in others. 



The stems are from i to 2 feet 

 high and covered with scattered rough 

 hairs. The leaves are rough, coarsely 

 serrate, and simply lyrate (with few 

 pinnatifid segments and a large ter- 

 minal lobe). It has racemose in- 

 florescences. The flowers are about 

 \ of an inch across with erect sepals, and usually pale straw- 

 coloured petals often veined with purple lines; occasionally the 

 petals are white or pale lilac tint. 



F1G.123. — Siliquesof: i. Turnip 

 {Brassica. Rapa L.). 2. Char- 

 lock {Brassica Sinapis Vis.). 

 3. White Mustard {Brassica 

 alia Vis.). 4. Wild Radish 

 {Raphanus Raphanistrum L.). 

 5. Black Mustard {Brassica 

 nigra Koch.). 



