28 



THALAMIFLOR.E 



19. Alliaria (Garlic Mustard) 



I. A. ofwinalis (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. cheiranthoides (Treacle Mustard, Worm Seed). — Leaves 

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

 green ; fods 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. orientale (Hare's-ear Treacle Mustard). — With smooth 

 entire leaves clasping the sletn, which is about i 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 Ciieiri 

 {W all-flower) 



21. Cheiranthus [Wall- flower) 



I. 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 

 some with 

 Perennial. 



varieties are cultivated in gardens, 

 blood-red flowers, some double. 



22. Matthiola [Stock) 



I. M. incana (Hoary Shrubby Stock, Gilli- 

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

 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. ^L sinnata (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. 



