274 TETRADYNAMIA SIUQUOSA. [cL. XV* 



4. N. amphibium. Amphibious Yellow-cress. Leaves oblong, 

 pinnatifid, or serrate ; roots fibrous ; petals longer than the calyx. 

 Stem two or three feet high, branched : flowers small : bright- 

 yellow. Perennial : flowers from June to September : grows in. 

 watery places : frequent. Eng.Bot. vol.xxvi.pl. 1840 : Sisymbrium 

 amphibium. Eng. Fl. vol. iii. p. 195. 972. 



19. SISY'MBKIUM. SISYMBRIUM. 



Calyx of four oblong, concave, spreading, deciduous leaves. 

 Petals oblong, obtuse, undivided, with claws nearly the length 

 of the calyx. Filaments thread-shaped, erect ; anthers heart- 

 shaped. Germen linear, sessile, slender. Style very short ; 

 stigma knobbed, notched. Pod linear, slightly angular ; valves 

 linear, concave, waved ; partition narrow, membranous. Seeds 

 numerous, small, oblong, arranged in a single row. Name, 

 used by the ancients. 332. 



1. S. officindle. Common Hedge Mustard. Pods downy, pressed, 

 close to the stalk ; leaves runcinate, hairy ; stem rough with de- 

 flected bristles. From one to two feet high, branched : leaves 



lyrate: flowers pale -yellow, small, corymbose. Warm and acid 

 to the taste. Infusion of it is said to be good for hoarseness, and 

 ulcers of the throat. Annual : flowers in June and July : grows 

 among rubbish, and by roads and hedges : common. Eng. Bot. vol. 

 xi.pl. 735 : Erysimum officinale. Eng. Fl. vol. iii. p. 196. 973, 



2. S. I'rio. London Rocket. Leaves runcinate, toothed, smooth ; 



stem smooth ; pods erect. About two feet high, smooth : 



flowers yellow, small. Annual : flowers in July and August : 

 grows in waste ground and among rubbish : rare. About London, 

 and Berwick. Eng, Bot. vol. xxiii. pi. 1631. Eng. Fl. vol. iii. p. 197. 



974. 



3. S. Sophia. Flix-weed. Leaves doubly pinnatifid, a little 



hairy ; petals smaller than the calyx. Stem slender, about two 



feet high : flowers small, greenish-yellow." Annual : flowers from 

 June to September : grows among rubbish and in waste ground : 

 frequent. Eng. Bot. vol. xiv. pi. 963. 975. 



20. MATTHI'OLA. STOCK, 



Calyx of four linear, oblong, concave, erect, converging, de- 

 ciduous leaves, two opposite ones protuberant at the base. 

 Petals inversely egg-shaped, spreading, with erect claws, as 

 long as the calyx. Filaments awl-shaped, the two outer much 

 shorter, and embraced at the base by a gland ; anthers oblong, 

 nearly erect, with two linear lobes. Germen oblong, some- 

 what compressed, shorter than the stamens. Style short and 

 thick, stigma two-lobed. Pod linear, compressed, convex or 

 keeled ; valves straight ; partition membranous, Seeds round, 

 compressed, having a membranous border, and arranged alter- 

 nately in a single row. Named after P. A. Matthioli, an 

 Italian physician. 333. 



1. HI. incdna. Hoary Shrubby Stock. Stem shrubby, erect, 

 branched ; leaves lance-sjiaped, obtuse, hoary with dense hairs. 

 About two feet high : flowers large, corymbose, with pale- 

 purple petals. Flowers in May and June : grows on rocks, near 



