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THALaMIFLOR^E 



19. Alliaria (Garlic Mustard) 



1. A. officinalis (Garlic Mustard, Jack-by-the-Hedge, or Sauce, 

 alone). Leaves broadly heart-shaped, stalked, heavily veined. 

 An early flowering hedge-plant, 1-3 feet high, with delicate green 

 leaves and snow-white flowers. The whole plant emits when 

 bruised a nauseous scent of garlic, from which it derives its Latin 

 and English names. Fl. April to June. Annual or biennial. 



20. Erysimum (Treacle Mustard) 



1. E. cheiranihoides (Treacle Mustard, Worm Seed). Leaves 

 narrow, slightly toothed, roughish with three-forked bristles, dull 

 green ; pods erect on spreading stalks ; stem branched, 1-3 feet 

 high ; flowers small, yellow, with whitish sepals. Fields, gardens, 

 and waste places, not common. Fl. June to August. Annual. 



2. E. orientate (Hare's-ear Treacle Mustard). With smooth 

 entire leaves clasping the stem, which is about 1 foot high ; flowers 

 cream-coloured. Grows on some parts of the coast of Essex, 

 Suffolk, and Sussex, but is an escape. Early summer. Annual. 



Cheiranthus Cheiri 

 (Wall- flower) 



21. Cheiranthus (W all-flower) 



1. C. Cheiri (Wall-flower). The only British 

 species, flourishing best on the walls of old 

 buildings, and producing its sweet-scented 

 yellow flowers nearly all the summer, although 

 scantily supplied with water. Not a true native, 

 but has become thoroughly established in many 

 situations of the kind described above. Many 

 beautiful varieties are cultivated in gardens, 

 some with blood-red flowers, some double. 

 Perennial. 



22. Matthiola (Stock) 



1. M. incana (Hoary Shrubby Stock, Giili 

 flower). Stem shrubby, 1-2 feet high ; leaver 

 hoary with down, entire ; flowers large, light 

 purple. The origin of the garden Stock. On 

 the southern seashore of the Isle of Wight. 

 Fl. May, June. Perennial. 



2. M. sinuata (Great Sea Stock). Stem herbaceous, spreading ; 

 leaves oblong, downy, the lower ones imperfectly lobed ; pods 

 rough with prickles ; flowers dull purple, very fragrant by night. 

 Fl. August. Biennial. Sandy sea-coasts of Wales and Cornwall 



