Brassicaceae 119 



Arabis hir- Stem erect nearly simple, 1-2 

 suta (L.) feet high, roughly hairy or nearly 



Scop. Hairy smooth. Basal leaves on mar- 

 Rock-cress. 



petioles forming a rosette, 

 obovate or spatulate, obtuse, denticulate, 

 1-2 inches long; stem leaves sessile, clasping 

 by an auriculate base, lanceolate or oblong. 

 Flowers \ of an inch or less long, white, in 

 a strict, elongated raceme; pods narrowly 

 linear, erect or appressed, 1-2 inches long. 

 In open grounds throughout the Rockies 

 at the lower altitudes ; flowering in June. 



Finely stellately pubescent 

 Arabis Hol- 



throughout; stems frequently 



Hornem. several, simple or branched, erect 

 Stony i_ 2 i f ee t high. Root leaves 



narrowly oblanceolate, entire, an 

 inch or less long; stem leaves linear-lanceo- 

 late to narrowly oblong, acute, sagittate. 

 Flowers rosy pink or rarely white, becoming 

 more or less reflexed, J of an inch long; pods 

 more or less abruptly reflexed, straight or 

 somewhat curved ij-2| inches long, very 

 narrowly linear. 



