40 CRUCIFER^. [LEPIDIUM. 



Flowers minute, usually apetalous and diandrous, in terminal and lateral 

 corymbs. Pods T^~rV * n -> ^ a ^ > pedicel slender," diverging ; valves keeled, 

 almost winged at the top; seeds compressed. DISTKIB. Europe, N.W. 

 Asia to the Himalaya ; introd. in U. States. 



SECTION 2. Le'pia, DC. Pod ovoid or oblong, much compressed, 

 notched ; valves broadly winged ; style short. 



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



pods concave papillose. Pepperwort. 



Fields and roadsides, from Lanaik and Elgin southd.; rare in Scotland and 

 Ireland ; Channel Islands ; fl. May-Aug. Glabrous or pubescent, annual or 

 biennial. Stem 6-18 in., erect, simple or branched. Radical leaves pinnati- 

 fid or entire, cauline oblong-lanceolate. Flowers -^ in. diam. Pods J in., 

 in spreading racemes, broadly ovate, shorter than the spreading pedicels ; 

 papillae scale-like when dry; seeds oblong, curved. DISTEIB. Europe, 

 N. Africa, N. and W. Asia to India ; introd. in U. States. 



L. CAMPES'TRE proper ; stem simple below branched above, anthers yellow, 

 pod papillose, style not longer than the notch. Common in dry places. 



Sub-sp. L. SMITH'II, Hook.-, branched from the base, anthers violet, pod nearly 

 smooth, style longer than the notch, seeds smaller. L. hirtum, Sm., in part. 

 Fields and banks ; ascends to 1,000 ft. in Ireland ; Channel Islands (AY. 

 Europe only). Yar. alatostyla, pod not notched, produced into the style. 

 Hants. 



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, banks, and railway cuttings in Mid. and S. England ; Channel Islands ; 

 rare and sporadic ; (an alien, Wats.) ; fl. May-June. Perennial, hoary or 

 downy. Stem 1-3 ft., branched above. Leaves 1-3 in., auricles converging, 

 lower petioled. Racemes short, panicled. Flowers J in. diam., white. Pods 

 in. broad, deltoid with rounded angles, on slender spreading pedicels ; 

 \alves slightly papillose, one often smaller or imperfect, enclosing the seed 

 when dehiscing. DIST.RIB. S.E. Europe, W. Asia ; introd. in U. States. 



18. THliAS'Pl, L. PENNY CRESS. 



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

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

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

 laterally compressed, broader upwards, notched ; valves keeled or winged. 

 Seeds few or many, not margined ; radicle 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, 

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

 5 -8 -seeded. Mithridate Mustard, Penny Cress. 



