

226 Nelson : New Plants from Wyoming 



Secured on the stiff, Wasatch tertiary clays (almost devoid of 

 other vegetation) at the Bush Ranch, near Steamboat Mt. in 

 Sweetwater Co., June 10, 1900, no. 7093. 



Musineon trachyspermum. I doubt if the reduction of this 

 Nuttallian species to a synonym of M. Hookeri is justifiable. 

 Among the specimens at hand from the interior desert region of 

 Wyoming is one from the clay hills in the vicinity of the Platte 

 River that answers well to the description in T. & G. Fl. J : 642. 

 It has been distributed under no. 4853. 



\S 



Lomatium purpureum 



Root thick, semi-woody, vertical, 1 dm. or more long, 1 cm. 

 (more or less) in diameter : leaves all basal, wholly glabrous, ter- 

 nate and each division pinnate or bipinnate ; the ultimate segments 

 small, from oblong to linear, 5-8 mm. long, obtuse or subacute ; the 

 primary petiole 5-9 cm. long, about as long as the rest of the leaf, 

 purple as are also the peduncles : scapes (peduncles) glabrous, 10- 

 20 cm. long, exceeding the leaves : umbel unequally 7-10-rayed, 

 the younger and shorter ones often aborting : involucre wanting ; 

 involucels of oblong, acute, green bractlets : rays 5-30 mm. long : 

 flowers yellow, pedicels very short, in fruit only 1-3 mm. long ; 



fruit glabrous, elliptic, 5-7 mm. long, the wings half as wide as 



the body, the dorsal and intermediate ribs evident, acute or even 

 narrowly winged : oil tubes 1-3 in the intervals, 4-6 on the com- 

 missural side. 



The specimens upon which this species is based were collected 

 in the Yellowstone Park in 1899 and distributed under a herba- 

 rium name in the sets of plants from that region. 



At that time I thought it a Pencedamim and I still see no rea- 

 son for changing that opinion except, of course, to adopt the name 

 Lomatium which Drs. Coulter and Rose have shown to be the 

 proper and tenable name of a large part of our west-American 

 plants that have so long been known as Peiicedanum* In the mon- 

 ograph cited, one of the numbers (5496) distributed is referred to 

 Pseudocymopterus montanns (Gray) C. & R. but on what ground 

 is not clear. Habital and fruit characters are certainly those of 

 Lomatium. The thin coherent lateral wings, the strengthening 

 cells beneath each rib and the obsolete calyx teeth point to this 

 rather than any other genus. In habit is much like L. orientale 



* Monog. N. A. Umbel. 204. 



