254 TETRADYNAMIA — SILIQUOSA. [Eri/simiim. 



Watery places, frequent. Fl. June — Aug If. — 2 — 3 feet high. If 

 any leaves crow under water, they are deeply pinnatifid, otlierwiso deeply 

 serrated. Pods short, small, but turgid, erecto-patent. 



23. Sisymbrium. Linn. Hedge-Mustard. 



1. S. officindfe, L. (co>n)no7i Hedge- 31 ustard) ; pods subulate 

 pubescent close pressed to tlie maiii-stalk, leaves ruucinate hairy, 

 stem \\\^}^\A.-^ Erysimum officinale, L. — E. Boi. t. 735. 



Waste places and b}' way-sides, plentiful. Fl. June, Jul}'. — One 

 to two feet high, branched. The deep and cut, serrated lobes are not 

 always sufficiently decurved to constitute a riincinate leaf: the terminal 

 lobe is very large, roundish in the lower leaves, and oblong in the upper 

 ones. Flowers very small, pale yellow. 



2. S. Irio, L. (broad Hedge-Mustard, London Rocket) ; leaves 

 runcinate toothed and as well as the stem glabrous, pods nearly 

 erect. E. Hot. t. 1631. 



Waste places, chiefly about London ; in which city it covered the 

 ground immediately after the great fire. Faulkbourn, Essex and Ber- 

 wick upon Tweed. Dublin. Fl. July, Aug. . — Flowers yellow. 

 Pods 2 inches long, erect. 



3. S. Sophia, L. (Jine-leaved Hedge-Mustard, or Flaxweed) ; 

 leaves doubly pinnatifid slightly hairy, lobes linear or oval, petals 

 shorter than the calyx. E, Hot. t. 963. 



Waste places, among rubbish ; frequent. Fl. Aug. Two feet 



high, branched. Flowers small, yellow. Pods linear, slender, erect, 

 but not appressed, the footstalk being a little patent. 



4. S. thalidnum, (coinmon Thale-cress) ; leaves somewhat 

 toothed hairy, radical ones oblong subpetiolate, stem branched, 

 pods ascending. — Arahis, L. — E. Hot. t. 901. 



Walls, dry banks and gravelly soils, common. Fl. Apr. May. 0. — 

 Six to ten inches high, slender, with few leaves, and those mostly radical. 

 Flowers small, white. The cotyledons are incumbent here, not accitm- 

 bent as in the true Arabis, with which, however, it agrees better in habit. 



24. Erysimum. Linn. Treacle- Mustard. 



1 . E. cheiranth aides, L. ( Worm-seed Treacle- Mustard) ; leaves 

 lanceolate entire or slightly toothed with stellato-tripartite hairs, 

 pods nearly erect their pedicels spi'eading, stigma undivided 

 nearly sessile. E. Hot. t. 942. 



Fields, gardens and waste places. Fl. July, Aug. 0. — 1 — 2 ft. high, 

 branched. Flowers small, yellow. 



2. E. Allidria, L. (Garlic Treacle-Mustard, Jack-by-the Hedge 

 or Sauce-alone) ; leaves heart-shaped stalked sinuato-dentate. 

 E. Bat. t. 796. — AlUaria officinalis, DC. 



Hedge-banks and waste places. Fl. May, June. $ . — Two to three 

 feet high, branched. Leaves large, veined, well known by their garlic- 

 like smell. Flowers white. Pods between erect and patent. 



3. E. orientdle, Br. (Hare's-ear Treacle-Mustard) ; leaves 

 cordato-amplexicaul, radical ones obovate, all glabrous glaucous 

 and entire — Brassica orientalis, Z E. Bot. t. 1804. 



