48 BRITISH BOTANY. 



large. Calyx glabrous or slightly hairy, or ciliate at the apex. 

 Petals much longer than the calyx, abruptly contracted into 

 short narrow claws ; pods nearly equal to the pedicels. 



Waste places near maritime towns. Per. ; June-October. It 

 is frequently seen on old walls, where the whole plant is much 

 smaller and the leaves are more entire than when it is in a more 

 luxuriant state. 



D. muralis, DC. Sand Mustard. — e.b. 1090. Sinapis mu- 

 ralis. — L.B.s. 121. 



A. 6. C. 12. Lat. 50-53°. Alt. 0-100 yds. Tern. 51-49°. 



E-oot annual. Stem erect, herbaceous, leafy at the base, not 

 usually so tail as the preceding, simple, with deflexed hairs. 

 Leaves usually pinnatifid, or sometimes only toothed or sinuate 

 (in luxuriant forms pinnatifid. 111 small plants nearly entire) ; 

 the root-leaves in a rosette. Sepals erect, much shorter than the 

 pedicels. Pods longer than the spreading pedicels, with a short, 

 stout cylindrical beak. 



Waste places about London, especially near the Thames ; not 

 rare. Annual; June- August. 



Erucastrum, Schimper and Spenner. Hirschfeldia, Moench. — 

 Annual or biennial plants, with pinnatifid petiolate leaves and 

 yellow flowers. Calyx equal at the base. Petals entire, ungui- 

 culate, stigma entire ; style conical or compressed with one seed 

 at its base. Pod short, cylindrical-linear, with convex valves, a 

 dorsal nerve and anastomosing veins. Seeds ovate, slightly com- 

 pressed, finely alveolate. 



E. incanum, Koch. — Sinapis incana, Lin. ? See Babington, 

 Prim. Flor. Sar. 



Stem erect or ascending, rigid, with spreading branches. Lower 

 leaves lyrate, with ovate, sinuate, or crenulate lobes ; the upper 

 oblong or lanceolate. Sepals spreading. Petals large, veined. 

 Cluster of fruit very long, rigid. Pods glabrous or slightly 

 hairy, turgid, appressed, on short pedicels, with a short beak. 



Sandy places in Jersey and Alderney. Annual or biennial ; 

 June-September. 



This plant has been collected during several seasons on the 

 waste ground between the Steam-boat Pier, Wandsworth, and 

 Mr. Watney^s distillery, with several other exotic Cruciferous 

 plants. 



