PLANTS OF NORTH ELBA 77 



Capnoides sempervirens (Z.) Bonk. 



Corydalis glauca Pursh 



Pale corydalis. Pink corydalis 



Rocky places ; often where fire has been and on rocks covered by thin 

 vegetable mold. Not rare. June to August. 



A form having white flowers was collected on the top of Altar moun- 

 tain, commonly known as Cobble hill or Cobble mountain. 



CRUCIFERAE 



Cardamine Pennsylvanica Muhl. 



Pennsylvanian bitter cress 



Swamps, streams and wet places. Common and variable. June. At 



South Meadow a small much branched but few flowered form was found. 



Cardamine parviflora L. 



C. hifsufa sylvatica Gray 



Small flowered bitter cress 



Thin soil on rocks. . Cascade lake near the eastern line of the town. 

 July. Very rare. 



Arabis laevigata {MuhL) Fair. 



Thin woods and clearings. Rare. Allen farm. June. 



Roripa Armoracia (Z.) Rite he. 



Nasturtiwn Armoracia Fries 



Horseradish 



Wet places. Lake Placid. June and July. Introduced and some- 

 times cultivated, but well established as a wild plant. 



Barbarea Barbarea {L.) MacM. 



B. vulgaris var. arcuata Gray 



Yellow rocket. Winter cress 



Head of Cascade lake. June. This is the only locality in North 

 Elba in which I have seen it. 



Sisymbrium officinale (Z.) Scop. 



Hedge mustard 



In gardens and waste places about dwellings, Raybrook and Lake 

 Placid. August. An introduced plant. 



