274 TETRADYNAMIA SILIQUOSA. [CL. XV. 



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



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



two or three feet high, branched : flowers small, bright-yellow. Peren- 

 nial : flowers from June to September : grows in watery places : frequent. 

 En*. Bot. vol. xxvi. pi. 1840 : Sisymbrium amphibium. Eng. Ft. vol. iii. 

 p. 195. 972. 



19. SISY'MBRIUM. SISYMBIUUM. 



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 knob- 

 bed, notched. Pod linear, slightly angular; valves linear, con- 

 cave, 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 deflected 



bristles. From one to two feet high, branched : leaves lyrale : 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. pi. 735 : Erysimum iifficinale. Eng. 

 Fl. vol. iii. p. 196. 973. 



2. S. 1'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 Septem- 

 ber : 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, deci- 

 duous 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, somewhat 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 mem- 

 branous border, and arranged alternately in a single row. Named 

 after P. A. Matthioli, an Italian physician. 333. 



1. M. incrfwa. Hoary Shrubby Stock. Stem shrubby, erert, branched; 



leaves lance-shaped, 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 Hastings, Sussex, but is not there 



