62 CRUCIFERAE 



Denizen. Viatical. Waste ground, rubbish heaps, but chiefly on 

 railway ballast, on which it has now become established throughout 

 the county. A. B. May-October. 



First record. D. muralis, Dr. F. A. Lees in Rep. of Bot. Rec. Club, 1883. 



1. Isis. Wytham. 



2. Ock, Kadley, F. W. Bennett. Denchworth, Wait. Botley. Grand- 



pont. Didcot, Wantage Eoad. Cholsey. On Abingdon Race- 

 course. 



3. Pang. Tilehurst, Lees. Pangbourn. Moulsford. Streatley. So 



abundant in 1896 on chalk ballast near Reading as to be 

 noticeable by its disagreeable odour as one passes by. 



4. Kennet. Midgham, Jackson. Reading, Tvfnail. Newbury. Theale. 



5. Loddon. Wood at Wargrave in 1871, Mehill. Maidenhead. 



Sonning. Twyford. Wellington College. Wokingham, &c. 



Var. Babingtokii i Syme, 1. c, as a var. of the sub-sp. D. muralis), 

 a biennial form with a more woody and leafy stem (see Bab. Man. Brit. 

 Bot. ed. 5, 29), has been noticed by the side of the railway near Grand- 

 pont, Appleford, Moulsford, Pangbourn, Reading, Maidenhead, &c. 



D. tenuifolia and D. muralis appear to be good species. They can be 

 readily distinguished by the fruit, as D. tenuifolia has the pod attenu- 

 ated at its base, while in D. tnuralis, even in the biennial state, the pod 

 is not so narrowed. 



D. muralis occurs in all the bordering counties. 



**Eruca sativa, Miller, Gard. Diet. ed. 8 (1768). Eeichb. Ic. Fl. Germ, et 



Helv, ill. f. 4421. Brassica Eruca, Linn. Sp. PL 66^ (1753). 

 Casual. By the railway at Didcot. Cholsey. Reading. Newbury. 



BURSA [Web. ex], Wigg. Prim. Fl. Holsat. 47 (1780). 



B. pastoris , Web. ex], Wigg. 1. c, and of Gerard, 214. Shepherd' s Purse. 

 Thlaspi Bursa-pasturis, Linn. Sp. PI. 647. Capsella Bursa-pastoris, 

 Medik. Pfl. Gatt. i. 85 (1792). C. Bursa, H. C. Wats. Top. Bot. 



Top. Bot. 31. Syme, E. B. i. 211, t. 152. Baxt. t. 191. Nyman, 66. 

 Fl. Oxf. 38. 



Native. Agrestal, pascual, &c. Waysides, cultivated ground, wall- 

 tops, &c. Abundant and universally distributed. A. Mar.-Nov. 



First record. Thlaspi Bursa-pastoris, about Oxford, Sir Jos. Banks, 1760, 

 in Herb. Brit. Mus. Tlilapsi (sic) Bursa-pastoris, Mavor's Agr. Berks, 

 1809. Ureclo Thlaspi, Sow., is very common on this plant^ about 

 Oxford, Baxt. Phaen. Bot. n. 191, 1837. 



Var. iNTEGRiroLiA, Beck, Fl. Nied. Oster. 492, of frequent occur- 

 rence, as at Marcham. 



Var. DENSiFOLiA (Mott. in Midi. Nat. Aug. 1885, under Capsella). On 

 wall-tops at Hinksey, Marcham, &c. On dry soil at Maidenhead. 



