LEPIDIUM.] CRUCIFER^E. 37 



2. Ii. rudera'le, L. ; annual, erect or prostrate, lower leaves 2-piuna- 

 tifid, pod orbicular-oblong notched. 



Waste places near the sea, E. and S. of England, rarer and probably not 

 indigenous elsewhere; a denizen? Watson; fl. May-June. Glabrous or 

 slightly pubescent. Radical leaves much divided, segments narrow ; upper 

 cauline linear, entire. Flowers minute, usually apetalous and diandrous, in 

 terminal and lateral corymbs. Pods A-A in., flat ; pedicels slender, diverg- 

 ing ; valves keeled, almost winged at the top ; seeds compressed. DISTRIB. 

 Europe, N. W. Asia to the Himalaya ; introd. in U. States. 

 SECTION 2. Lepia, DC. Pod ovoid or oblong, much compressed, 



notched ; valves broadly winged ; style short. 



3. L. campes tre, JBr. ; cauline leaves auricled toothed, anthers yellow, 

 pods concave papillose, style not longer than the notch. Pepjjerwort. 

 Fields and roadsides, from Lanark and Elgin southwards, rare in Scotland and 



Ireland ; fl. May-Aug. -Glabrous or pubescent, annual or biennial. Stem 

 6-18 in. , erect, simple or branched. Radical leaven pinnatifid or entire, cauline 

 oblong-lanceolate. Flowers A in. diam. Pods J in., in horizontal racemes, 

 broadly ovate, shorter than the spreading pedicels ; papillae scale-like when 

 dry ; seeds oblong, curved. DISTRIB. Europe, N. Africa, N. and W. Asia 

 to India ; introd. in U. States. 



4. L. Smith'ii, Hook. ; cuuline leaves auricled toothed, anthers violet, 

 pods concave slightly papillose, style longer than the notch. L. hirtum, 

 Sin. in part. 



Fields and roadsides, from Moray southwards, rare in Scotland, ascending to 

 1,000 ft., and in Ireland ; fl. April- Aug. Habit of L. campestre but perennial, 

 more down}', with a large style and less papillose pod, probably a form of 

 L. hirtum, L. DiSTRIB. W. Europe. 

 SECTION 3. Carda'ria, DC. Pod deltoid-cordate, constricted between 



the valves ; valves hardly keeled, not winged ; style distinct. 



L. DRA'BA, L. ; stem flexuous leafy, leaves oblong .amplexicaul toothed. 



Fields, hedgebanks, and railway cuttings, rare and sporadic in Mid. and 



5. England, but hardly naturalized ; an alien, Watson ; fl. May-June. 

 Perennial, hoary or downy. Stem 1-3 ft., branched above. Leaves 1-3 in., 

 auricles converging, lower petioled. Racemes in branched panicles. Flowers 

 | in. diam., white. Pod J in. broad, deltoid with rounded angles, on slender 

 spreading pedicels, disposed in short racemes ; valves slightly papillose, one 

 often smaller or imperfect, enclosing the seed when dehiscing. DISTRIB. 

 Central and S. Europe, W. Asia ; intrpd. in U. States. 



18. THLAS'PI, L. PENNY CRESS. 



Annual or perennial, glabrous, often glaucous herbs. Leaves quite entire 

 or toothed, radical rosulate, cauline hastate. Flowers white or rose- 

 coloured. Sepals erect, equal at the base. Petals obovate. Pod short, 

 laterally compressed, broader upwards, emargiuate ; valves keeled or 

 winged. Seeds few, not margined ; cotyledons accumbent. DISTRIB. 

 Temp., Alpine, and Arctic N. hemisphere, rare in South; species 30. 

 ETYM. The old Greek name of the genus. 



1. T. arven'se, L. ; annual, cauline leaves sagittate sinuate-toothed, 

 pod large orbicular deeply notched, valves broadly winged all round, cells 

 6-8 seeded. Mandate Mustard. 



