February 1.5, 1917 39.5 



weed in fields, vacant lots and waste places everywhere ab(Mit 



the city. Naturalized from Kurope. April to October, Yellow. 



SiSYMHRiUM [Tourn.] L. Hedge mustard. 



Sisymbrium okkicinalk (L) Scop. 2. Hedge nmstaid. 

 I^Erysiniinn officinale) Coniiuon in fields and waste places around 

 Portland. Naturalized from Europe. April to October. Small, 

 yellow. 



X Sisymbrium officinalr leiocarpu.m DC. 2. Smooth 

 podded mustard. Common weed in fields and waste places 

 around Portland. Naturalized from Europe. April to October. 

 Yellow. 



X Sisymbrium Thalianum (L.) Gray, i Mouse-car cress. 

 Common in fields and nuji.st sandy and rocky places, Oak Grove, 

 etc. Natnialized froni Europe. April to June. White. 



X Sisymbrium altissimum L. 1-2. Tumbling mustard. 

 Recent and undesirable immigrant in dry sandy waste places and 

 along railroad tracks, East Portland, Infrequent here as yet. 

 Commonly known in the northwest as "Ji^" IWW mustard." Ad- 

 ventive from Europe. April to June. Pale yellow. 

 Draba [Dill.] L. Whitlow grass. 



Draba VERNA L. I. Vernal whitlow grass. {Erophi I a vul- 

 garis) Infrequent but locally abundant on moist sandy slopes, 

 roadsides and waste places, Sandy Boulevard, Hemlock station, 

 Vancouver, etc. Naturalized from Europe. ]\Iarch, Apiil. White. 



Draba lkiocarpa Lindl. i. Slender whitlow grass. {D. 

 luica.) On sandy banks, Willamette liver near Oswego. May 

 to Jul)'. Yellow. 



Cardamine [Tourn.] L. Bittex cress. 



Cardamine angulata Hook. /\. Angular leaved cress. 

 In moist woods, Balch creek and near Linnton. April to June. 

 While. 



Cardamine occidentalis (Wats.) Howell. 4. Western 

 bitter cress. Wet places, Lower Albina, Milwaukie, Sauvit's 

 island, etc. April to June. White. 



Cardamine pratensis L. 4. Meadow bitter cress. Shal- 

 low ponds and wet places near Milwaukie. April, May. While. 



