Cardamine parviflora var. arenicola (Britt.) O. E. Schulz. . . . Bittercress. 



Frequent in woods and fields. 

 Dentaria laciniata Muhl Toothwort. 



Wooded areas. 

 Draba verna L Whitlowgrass, spring draba. 



Frequent in cultivated soil. 

 Lepidium campestre (L.) R. Br Field pepperweed. 



Common in fields. 

 Lepidium virginicum L Virginia pepperweed. 



Common everywhere. 

 Rorippa islandica var. fernaldiana Butt. & Abbe 2 Yellowcress. 



Wet soil. 

 Sisymbrium officinale (L.) Scop Hedgemustard. 



Common in cultivated soil. 

 Sisymbrium thalianum (L.) J. Gay Mouse-ear cress. 



Abundant. One of our best examples of a winter annual. 



SAXIFRAGACEAE 



Heuchera americana L Alumroot. 



Shaded banks. 

 Saxifraga virginiensis Michx Virginia saxifrage. 



Open hillsides and thin woods. 



HAMAMELIDACEAE 



Hamamelis virginiana L Witch-hazel. 



Scattered through woods. 



PLATANACEAE 



Platanus occidentalis L Planetree, sycamore. 



Low ground along streams. 



ROSACEAE 



Agrimonia parviflora Ait Agrimony. 



Meadows and thickets. 

 Agrimonia rostellata Walk. 



Occasional in woods. 



2 A plant that appears to be Rorippa sinuata (Nutt.) Hitchc. has become established 

 in the nursery beds west of the greenhouses, location 18. 



22 



