February 15, 1917 397 



CiiKiRANTHUS L. Wall flower. 

 Cheirantiil'S KLATUS (Nutt.) Greene. 4. Tall wall flower. 

 On rocky cliffs and sandy slopes, Macleay Park, Sonlh Portland, 

 Elk Rock. April to July. Yellow or orange. 



Bursa Weber. Shepherd's purse. 



Bursa Bursa- pastoris (L.) Weber, i. Shepherd's purse. 

 Common weed in fields, lawns, roadsides and waste places every- 

 where. Naturalized from Europe. Feb. to Nov. White. 

 CoRONOPUS Gaertn. Wart cress. 



Coronopus didymus (Iv.) J. E. Smith. 1-2. Lesser wart 

 cress. In ditches and moist waste places, East Portland, Lower 

 Albina. Naturalized from Europe. May to July. Minute, green- 

 k>-li-white. 



X CORCNOPUS PROCUMBENS Gilib. 1-2. Swine cress. In- 

 frequent on ballast grounds and waste places. Lower Albina, 

 East Portland, etc. Not nearly so much inclined to spread or 

 become a weed as is the preceding species. Adventive from 

 Europe. May to August. Greenish-white, minute. 



Lepidium [Tourn.] L. Pepper grass. 



Lepidium medium Greene, i. Round podded pepper grass. 

 Hillsides and sandy places, Sandy Boulevard. May to July. White.. 



Lepidium apetalum Willd. i. Roadside pepper grass. 

 Dry sandy slopes, Sandy Boulevard. May t j July. Greeuish-white. 



Thlaspi [Tourn.] L. Penny cress. 

 X Thlaspi arvense L. i. Field penny cress. In fields 

 and waste places about the city. Frequently known as "French- 

 weed" by farmers. Naturalized from Europe. INIay to July. White. 



Athysanus Greene. Hairy pod. 

 Athysanus PUSILLUS (Hook.) Greene, i. Hairy pod. In- 

 frequent in rocky places. Elk Rock and near Oswego. March, 

 April. White. 



Raphanus [Tourn.] L. Radish. 

 Raphanus saTIVUS L. 2. Radish. In fields, roadsides and 

 waste places around Portland. Introduced from Europe, but na- 

 tive of China. April to October. Purple, pink or white. 



