78- 



ERYSIMUM. L. Treacle Mustard. 



14G. E. CHEiRANTHO'iDES, L. ( Worm-seeJ' Mustavcl ) 

 Every whei-e. June (B). 

 SISYMBRIUM, L. Hedge Mustard. 

 150. S. officinale, Scop. 



Roadsides. July 1. (B.) 

 BRASSICA. Tourn. Cabbage. Musta^rd. 



159. B. Sinajnstrum, Boiss. (Wild Mustard, "Charlock.") 

 Cultivated ground. A most troublesome and persistent weed in 



many parts of Canada. Pods knotty, smooth, one-third con- 

 sisting of a stout two-edged and one-seeded beak. Seeds i-eddish 

 black. June. (B). 



160. Jj. alba, Gray. (Garden Mustard.) 



A garden escape. Easily known by its bristly pods, more than 

 half of v/hich consist of the one-seeded beak. Seeds yellow. 

 July 1. 



161. JJ. nigra, Koch. (Black Mustard.) 



Roadsides. Scarce at Ottawa. Pods smooth, fonr-cornereLl, erect 

 on appressed pedicels. Seeds dark brown. June. 

 CAMELINA, Crantz. False Flax. 

 191. C. saliva, Crantz. 



An occasional weed in field.sof grain. Ju. 2. 

 NESLTA, L. 



2107. iV. panietdata, L. 



Rarely introduced with bird-seed. A small plant with sparse 

 stellate-pubescence, small bright yellow flowers and round 

 pods. Ju. 3. 

 CAPSELLA, Vent. Shepherd's Purse. 

 197. C. Bursa-pasioris, Mcench. 



Everywhere around inhabited localities. ^lay. (B.) 

 THLASPT, Tourn. Penny-cress. 



199. T. arvense, L. (Mithridate Mustard.) 

 Waste places. Ju 1. 

 LEPIDIUM, L. Pepper-wort. 



202. L. sativum, L. (Garden-cress.) 



A garden esca.pe frequently found in waste places. Ju 2, 



