GROUP V. ANGIOSPERM*: ; DICOTYLEDONES. 537 



Tribe 1. Arabidece. Q=. Cheiranthus Cheiri, the Wall-flower, and 

 Matthiola annua and incana, the Stocks, are cultivated as garden-plants. 

 Nasturtium qfficinale is the Water-cress. Barbarea vulgaris is the Yellow 

 Rocket. Cardamine (incl. Dentaria) also belongs to this tribe. 



Tribe 2. SisymbrtecK. Q \\ . Sisymbrium officinale, the Hedge-Mustard, 

 is common on rubbish heaps ; and Erysimum, the Treacle-Mustard, on 

 walls, etc. Hesperis is the Dame's Violet. 



Tribe 3. Brassicecn. Q^> The species and varieties of Brassica are 

 much cultivated. Brassica oleracea is the Cabbage, with the following 

 varieties ; acephala, Scotch kale, Cow-cabbage or Borecole ; bullata, the 

 Savoy -cabbage 5 capitata, the red and white Cabbage; caulorapa, with thi 1 

 stem swollen at base, is the Kohl-rabi; Botrytis, with connate fleshy 

 peduncles and abortive flowers, is the Broccoli (asparagoides) and the 

 Cauliflower (cauliflora) ; gemmifera^ with numerous lateral leaf-buds, 

 known as Brussels-sprouts. Brassica campestris is the wild Navew; it 

 includes the following sub-species; Itapa, the wild Turnip, with bright 

 green hispid leaves and flat corymbs of flowers, among the cultivated 

 varieties of which is the var. depressa, the Turnip : Napus, the wild Rape, 

 with glabrous glaucous leaves and long racemes of flowers, several varie- 

 ties of which are cultivated for their oily seeds, and one (var. esculenta, 

 the Teltow Turnip) for its fleshy root : Napobrassica, the Turnip-cabbage, 

 including Rutabaga, the Swedish Turnip. B. campestris oleifera is the true 

 Colza or Coleseed, from the seeds of which colza-oil is obtained. Brassica 

 (Sinapis) nigra and alba are the black and white Mustard. Brn**i<-i' 

 Sinapis (Sinapis arvensis) is the Charlock or Corn-Mustard. To this tribe 

 belongs also the genus Diplotaxis. 



Sub-order 2. SILICULOS.E. Fruit a silicula. 



A. LatiseptcE. The dessepiment is. in the longest diameter of the silicula. 

 Tribe 4. Alyssinece. Q =. Cochlearia officinalis is the Scurvy-grass ; C. 



Armoracia, the Horse-radish, has a thickened root. Alyssum cali/cinum and 

 Draba (Erophila) verna t the Whitlow-grass (Fig, 348 E), are common 

 weeds : Lunaria biennis is Honesty, 



Tribe 5. Camelinece. Q || . To this tribe belong Camelina (Gold-of- 

 pleasure), and Subularia, the Awl- wort, an aquatic plant. 



B. Anguntiseptce. The dissepiment is in the shortest diameter of the 

 silicula. 



Tribe 6. Lepidinece. Q || . Capsella Bursa Pastoris, the Shepherd's 

 Purse, is common, as also various species of Senebiera and Lepidium 

 (Cresses). 



Tribe 7. T/ilaspidece. Q =. Various species of Thlaspi, the Penny- 

 Cress, are common. To this tribe belong also the British genera Iberi* 

 (Candytuft), Teesdalia, and Hutchinsia. 



Sub-order 3. NUCUMENTACEVE. Silicula indehiscent, few-seeded. 



Tribe 8. Isatidece. laatis tinctoria, the Woad, has compressed, pendul- 

 ous, unilocular, one-seeded fruits (Fig. 348 F) : the leaves yield a blue 

 dye. 



Sub-order 4. LOMENTACE^:. Fruit a siliqua or silicula, constricted into 

 one-seeded segments (lomentaceous) (Fig. 348 G). 



