1912] NELSON— IDAHO PLANTS 139 



It is interesting to add another American species to this singularly erratic 

 genus. I have no doubt that the describer of L. pusilla Curran was right in her 

 observation " stamens 5/' in spite of the fact that later observers have noted 

 only 3. The plants now at hand show this tendency to vary the number of 

 stamens, and occasionally to develop petals also. Is the following statement 

 of the manuals correct, "ovules attached laterally," or does the wording in this 

 description come closer to the fact ? 



Secured by Macbride in the grass among the sagebrush, on the plains 

 near New Plymouth, April 24, 191 1, no. 773. 



Arabis lignipes impar, n. var. — Larger and coarser than the 



nip 



1900), the lignescent 



more enduring, often 8-10 cm 



only by the scalelike leaf bases: pubescence extending to the 



mature 



The type of this variety is Macbride's no. 828, dry, stony slopes, on Squaw 

 Creek, Sweet, Idaho, May 8, 191 1. I refer here also specimens by C. N. Woods, 

 Hailey, Idaho, no. ga, 1910. 



Draba lapilutea A. Nels. in Coult. & Nels. Man. 222. 1909. 

 D. yellowstonensis Al Nels. Bot. Gaz. 30:189. 1900. — Fine speci- 

 mens of this strongly marked species were secured by Nelson and 

 Macbride on a high mountain near Mackay. It accords very 

 closely with the type except that some of the specimens indicate 



may sometimes 



The flowers are 



m 



McCalla 



1901, are very near allies, if indeed they be not both referable to D. lapilutea. 



Parrya Huddelliana, n. sp. — Perennial from very long slender 

 flexible woody roots which penetrate far down among the rocks in 

 subalpine slides: caudex of few-several very slender (almost 

 filiform) somewhat scaly branches which elongate (even to several 

 dm.) sufficiently to bring the herbage out among the surface rocks: 

 leaves rosulate on the tips of the branches of the caudex, with some 

 scales or petioles for a few cm. below, narrowly spatulate- 

 oblanceolate, 12-25 mm - l° n g> somewhat cinereous with a stellately 

 branched pubescence: inflorescence a short crowded corymbose 



almost 



umbellate 



10- 1 c mm. lone: nods oblong or bicuneate. 2-x cm 



