CONTRIBUTIONS FROM THE ROCKY MOUNTAIN 



HERBARIUM. XI 



NEW PLANTS FROM IDAHO 



Aven Nelson 



(with two figures) 



* 



The papers in this series numbered IX and X both dealt with 

 novelties secured by Mr. J. Francis Macbride, of New Plymouth, 

 Idaho, in his collections of 1910. The region that proved of great- 

 est interest during that season was certain portions of Owyhee 

 County in the southwestern part of the state. However, he found 

 it possible to visit other counties, and in all of them much of interest 

 was secured. 



He spent the season of 191 1 also in the field, revisiting some of 

 the favored localities at earlier dates, and going into new fields 

 later in the season. The writer found it possible to ioin 



Macbride 



month of July, at which time 



lava lands of southern Idaho were investigated. A few days were 

 spent also in the Sawtooth and in the Lemhi National forests. 

 This and a succeeding paper will deal with some of the many inter- 

 esting things that were found. The plants to be sent out will bear 

 Macbride's numbers, but those secured while both were in the 

 field will have both collectors' names upon the labels. 



Sisyrinchium inalatum, n. sp. — Roots coarsely fibrous, in- 

 ordinately numerous from the small cormlike rhizome, widely 

 spreading: stems simple, tufted and crowded, erect, 3-4 dm. high, 

 rather stout, wholly wingless, leafy below, more than twice as long 

 as the longest leaf, about 10-striate: leaves 9-15-nerved, hyaline- 

 margined at the middle only where they are often 6-8 mm. broad, 

 the upper half somewhat divergent, either straight or somewhat 



arcuate : 



conspicuous, 4-6 cm 



1 



many-nerved, at its widest part (where it is more or less scarious- 

 margined) 8-10 mm. broad, tapering gradually to the apex, usually 

 surpassing even the mature umbel by nearly half (sometimes more), 



Botanical Gazette, vol. 54] 



[136 



