W19 



MOUNTAIN ROCKCRESS 



A'rabis drummon'dii, syn. A. oxyphyl'la 



Flowers in an unbranched terminal cluster 

 (raceme) 



Petals 4, white or pinkish, showing cross-like 

 (cruciform) arrangement 



Stamens 6, 2 of them shorter than other 4 



Outer flower parts (sepals) 4, greenish 



Seed pods (siliques) erect, crowded, up to 3 in. 

 long; seeds numerous, in 2 rows 



* Seed enlarged to show winged margin 



Stem leaves alternate, with clasping bases, 

 1 to 2 in. long, mostly without hairs or some- 

 times hairy on the margins 



Basal leaves in clusters (rosettes), short- 

 stalked, somewhat smaller than stem leaves, 

 with entire margins, reverse-lance-shaped with 

 the broader end uppermost 



Taproot 



