42 



and grows in the lower part of the Lower Temperate Life Zone 

 on sagebrush mesas, the species extends from northern Nevada 

 along the eastern base of the Sierras at least as far as San Felipe 

 near the Mexican border, also eastward as far as Goldfield, Tono- 

 pah and Death Valley, but farther eastward is replaced by the var. 

 Munciensis, and northward by A. arcuara. All material from Ore- 

 gon referred here and seen by me is A. arcuata. The seeds are 



clearly in two rows. 



Munc 



Flowers about 8 mm. long. Petals nearly obovate, purple. Pods 

 not appressed, pendent on nearly horizontal pedicels, 2-2.5 mm. 

 wide. All the upper leaves aurieled, the lowest less so and nearly 

 obovate-spatulate, 1.5-o cm. long. Eastern Nevada from near Iba- 

 pa western Utah and westward. This looks like a hybrid between 

 arcuata and pulchra, but neither parent grows with it. 



Arabis pulchra var. pailetis n. var. 



Flowers nearly white, about 10 mm. long. Petals broadly oblan- 

 ceolate, more than twice the sepals. Pedicels about 5 mm. long, 

 reflexed and with the pendent pods rather appresscd and 2 mm. 

 wide and with a distinct thick beak longer than the width of the 

 stigma. Leaves all linear or very narrow, not aurieled. This is the 

 only form in the Navajo Basin. First collected by me in 1S83. It 

 extends from Price to Grand Junction. 



