396 Muhlenbergia, Volume 2 



Cardamine oltgospeRMA Nutt. I. Annual cress. Under 

 coniferou:^ trees, Macleay Paik, Mt. Tabor, etc. April to June, 

 White. 



Df.ntaria [Tourn.] L. Toothwort. 



Dentarta TENEI.LA Puri.h. 4. Small toothwort. Common 

 in open woods in eaily spiino;, I\Iac!eay Paik, Cornell road, Mt. 

 Tabor, Mt. Scott, Sellwood, etc. IMarcli to May. Rose-purple. 



Arabis L. Rock cress. 

 Arabis HIRSUTA (L ) Scop. 2. Hairy rock cress. Base of 

 rocky cliffs. Elk Rock, April to August. White. 



Arabis perfoliat.\ Lam. 2. Tower mustard. On dry 

 ridges and rocky places near Oswego. Apiil to July. Whitish. 



Campe Dulac. Winter cress. 



Campe AMERICANA Rydb. 4. Western yellow rocket. {Bar- 

 barea vulgai'is^ Common in fields and along stream banks 

 about the city. April to June. Bright yellow. 

 Radicula [Dill.] Hill. Cress. 



Radtcula PALi'STRis (L.) Moeuch. 2. Yellow water cress. 

 {Roripci palustris.) Wet places and streau) banks, Swan island, 

 Sauvie's island, etc. April to July. Yellow. 



Radicula PACIFICA (Howell) Greene. 1-2. Western yellow 

 cress. {Roripa pacijica.) On alluvial soil, Sauvie's island. 

 April to June. Yellow. 



Radicula curvisiijqua (Hook.) Greene. 1-2. Curved 

 fruited cress. {^Roripa ciirvisiliqui) Stream banks, Fulton, 

 Oswego, Oregon City, etc. April to June. Yellow. 



X Radicula indica (DC.) 2. East Indian cress. Ballast 

 j^roundsand waste places, Lower Albina. Adventive from India. 

 May t(9 July. Yellow. 



Radicula Nasturtium-aquatica (L) Britten & Rendle. 

 4. Water cress. {^Nastiirtium officinale.') Common in running 

 water, ditches, and about springs. East Portland, South Port- 

 land, Goldsmith's Addition, etc. Largely used as greens and 

 occasionally cultivated. Naturalized from Europe. April to Oc- 

 tober. White. 



