248 UMBELLIFERAE 



Brit. Mus. by Mr. W. T. Dyer from the Thames near Oxford is Slum 

 latifoliuynj] 



Oe. Jluviatilis, which is too abundant and generally distributed in our 

 larger streams to need the enumeration of localities, occurs in all the 

 bordering counties, in Bucks, at Denshanger, &c., and near Lechlade 

 in E. Gloucestershire. 



AETHUSA, Linn. Gen. n. 317. 

 Ae. Cynapiuni, Linn. Sp. PI. 256 (1753). Fool's Parsley. 



Cynapium, Rivinus, Pent. Irr. 76. Ethusa, Linn. Syst. 1735. 

 Top. Bot. 199. Syme, E. B. iv. 132, t. 600. Nyman, 297, Fl. Oxf. 133. 

 Native. Agrestal. Cultivated ground. Abundant and generally dis- 

 tributed, occurring as a garden weed in Reading, &c, A. May- 

 October. 

 First record. Ae. cynapium, Mavor's Agr. Berks, 1809. 



It occurs in two marked forms, i. e. var. hortensis, Boenn. Prod. Fl. 

 Monast. 84, growing in garden ground and in rich soil, which in its 

 extreme state is var. Ae. elata, Friedl., and is sometimes a yard in 

 height ; and var. agrestis, Wallr. Sched. PI. Grit. (1822' 119 = var. 

 pygmaea, Koch, Syn. Fl. Germ. 293 (1837) — ^^- segetalis, Boenn. 1. c, 

 and is locally common in stubble fields and among corn crops. The 

 latter is a small form usually less than four inches high, with the 

 involucels very attenuated. I have seen it at Cumnor, Buscot, 

 Wootton, South Hinksey, Lockinge, Wantage, Appleford, Wittenham, 

 Yatteudon, Bradfield, Theale, Newbury, Maidenhead, Twyford, Bin- 

 field, Finchampstead, Windsor, &c. 

 Arethusa Cynapium is found plentifully in all the bordering counties. 



SILAUS, Bernh. Syst. Verz. Erfurt (1800), 116. 

 S. flavescens, Bernh. I.e. 174 (1800). Pepper Saxifrage. 



S.pratensis, Bess, bei Sprengl. in Schult. Syst. vi. 36(1820). S. Silaus, 

 Karst. Peucedanum Silaus, Linn. Sp. PI. 246 (1753). 



Top. Bot. 200. Syme, E. B. iv. 139, t. 604. Nyman, 292. Fl. Oxf. 133. 



Native. Pascual. Roadsides, meadows, pastures, &c. Rather com- 

 mon and widely distributed, more frequent in stiff soils ; absent 

 from the heathy tracts and from some portions of the Chalk 

 downs. P. June-October. 



First record. Peucedanum silaus, Meadow Sulphur Wort, Di*. Noehden, 

 Mavor^s Agr. Berks, 1809. 



1. Isis. Wytham. Eynsham and Cumnor meadows. Appleton. 



Buscot. Faringdon. Shrivenham. Coleshill. Bablock 

 Hythe, &c. 



2. Ock. Childswell Farm, Bosicell. Marcham, Walker. Uffington, 



