1 6 WHITE TO GREEN 



A plant somewhat resembling ^. Holbcvllii, but its flowers are 

 more confined to the top of the stalk. They are usually white. 



HAIRY ROCK-CRESS 



A?-abis hirsuta. Mustard Family 



Stems: erect, nearly simple, rough-hairy. Leaves: in a rosulate cluster, 

 ovate to spatulate, sparsely dentate ; stem-leaves partly clasping by a cor- 

 date base. Flowers: white, small. Fruit: pods strictly erect, linear. 



This plant is easily distinguished from the other Rock- 

 cresses by its hairy stalks and leaves. 



DRUMMOND'S ROCK-CRESS 



Arabis Dntmmondii. Mustard Family 



Stems: erect. Leaves: lanceolate, sagittate. Flowers: petals white (sel- 

 dom pink), twice the length of the sepals. Fruit: pods loosely erect ; seeds 

 wing-margined. 



A handsome leafy species of Rock-cress, very abundant 

 in some localities. It has erect flat pods. 



WHITE WHITLOW-GRASS 



Draba incana. Mustard Family 



Stems: hoary, pubescent. Leaves: oblong-lanceolate, nearly entire. 

 Flowers: petals notched ; style minute. Fruit: pods acute, twisted when 

 ripe, on short erect pedicels. 



A plant partaking of the appearance of a weed, and closely 

 resembling a white mustard. 



For D. alpi7ia and D. aurea see Yellow to Orange Section. 



SHEPHERD'S PURSE 



C apse Ha Bursa-pas torts. Mustard Family 



Stems : branching. Leaves : mostly runcinate-pinnatifid, cauline, lanceo- 

 late, auricled at base. Flowers: small, white, in long loose racemes; 

 petals four ; sepals four. Fruit : pods cuneate-triangular, truncate above ; 

 seeds ten or twelve in each cell. Not indigenous. 



