278 TETRAD YNAMIA SILIQUOSA. [CL. XV. 



inside of each of the outer, and one at the outside of each of 

 the longer pairs ; anthers oblong. Germen cylindrical. Style 

 very short ; stigma knobbed. Pod nearly cylindrical, beaked ; 

 valves undulated ; partition membranous, the beak also often 

 contains a seed. Seeds nearly globular, arranged in one row. 

 Name, sinapi, used by the Greeks. 339. 



1. arvensis. Field Mustard, or Charlock. Pods with many 

 angles, knotty, longer than their awl-shaped beak ; leaves toothed, 



partly egg-shaped, partly lyre-shaped. -Root small, tapering, 



hard : stem from one to two feet, rough with reflected bristles, as 

 are the leaves : flowers greenish -yellow. Annual : flowers through 

 the summer and autumn : grows in corn-fields, abundantly. Eng. 

 Bot. vol. xxv. pi. 1784. Eng. Fl. vol. iii. p. 221. 990. 



2. S. alba. White Mustard. Pods bristly, knotty, shorter than 



their two-edged beak ; leaves lyre-shaped. Stem rough, about a 



foot and a half high : flowers large, yellow. Eaten when young as 

 salad. Annual: flowers in July : grows in waste places and corn- 

 fields : frequent. Eng. Bot. vol. xxiv. pi. 1677. Eng. Fl. vol. iii. 

 p. 222. 991. 



3. S. nigra. Common Mustard. Pods closely pressed to the stalk, 

 four-cornered, smooth, with a short beak ; lower leaves lyre-shaped, 

 upper narrow lance-shaped, entire, smooth, stem from three to four 

 feet high : flowers yellow. Annual : flowers in June and July : 

 grows in waste places and fields : frequent. The common mustard 

 used at table is obtained from the seeds. It is also employed as a 

 stimulant to the soles of the feet in fevers, and to various parts of 

 the skin as a rubefacient. Eng. Bot. vol. xiv. pi. 969. Eng. Fl. vol. 

 iii. p. 222. 992. 



4. /S. incdna. Pods closely pressed to the stalk, turgid, with an 

 egg-shaped one- seeded beak; lower leaves lyre- shaped, hispid, 



upper between linear and lance-shaped ; stem much branched. 



The pod is either smooth, or hairy with a glabrous beak : seeds egg- 

 shaped, compressed. Biennial : flowers in July and August : found 

 in the islands of Jersey and Alderney by Mr. Babington. Brit. Fl. 

 4th ed. p. 257. Prim'. Fl. Sarn. p. 9. 993. 



5. S. Cheirdnthus. Wall-flower Mustard. Pods erect, cylindrical ; 



leaves all stalked, hairy, deeply pinnatifid. Stem hispid at the 



base : lobes of the leaves unequally toothed, those of the, upper 

 linear. Biennial : flowers in July and August : discovered by Mr. 

 Babington on the sea-shore in Jersey and Alderney, and described 

 in his Plora of the Channel Islands. Eng. Bot. S^lppl. pi. 2821. 

 Prim. Fl. Sarn. p. 9. 994. 



6. S. tenuifolia. Narroiu -leaved Wall Mustard. Pods erect, linear, 

 compressed, slightly beaked, on spreading stalks ; seeds in two 

 rows; upper leaves lance-shaped, undivided, lower once or twice 



pinnatifid ; stem smooth. Stem erect, much branched, two feet 



high : flowers large, pale-yellow. The whole plant is acrid, and 

 has a disagreeable smell. Perennial : flowers from June to Octo- 

 ber : grows on heaps of rubbish and old walls, about towns : not 

 common. Eng. Bot. vol. viii. pi. 525. Eng. Fl. vol. iii. p. 223. 995. 



7. S. murdlis. Sand Mustard. Pods ascending, linear, compress- 

 ed, slightly beaked, on spreading stalks ; seeds in two rows ; leaves 

 sinuate ; stem covered with reflected bristles. Stem about eight 



