224 Nelson : New Plants from Wyoming 



ters but fruit characters are not wanting. It is only the ampler 

 and well fruited specimens of the collections of 1900 (which have 

 not yet been distributed) that makes this segregation possible. 



That Dr. Rose himself was inclined to think that the material 

 represented two species is shown by the fact that some of the 

 numbers of the collections of 1896 and 1897 were at that time 

 named L. Porteri while the specimens that he has made his type 

 numbers were not referred to any species. 



L. ajfine is the larger plant, with pale-green foliage in contrast 

 to the dark-green of the others ; the leases are more decompound 

 and the segments more deeply cleft with much narrower lobes; 

 the naked peduncles (often subcorymbose) conspicuously surpass 

 the foliage ; the umbels are more compact ; the fruits larger, 

 broader and more evidently winged ; the number of oil tubes 

 greater (mostly 3 in the intervals and 6-8 on the commissural 

 side in L. simulans) . The two species grow in similar situations 

 and at the same stations but not, so far as my observations go, 

 commingled. My collections of them have always been kept dis- 

 tinct in the field. I cite 7695, Centennial, Albany Co., July 26, 

 1900, as type. Of the numbers named under L. simulans I 

 would here refer 1784, 4175 and possibly others. 



Pseudocymopterus sylvaticus 



Root fleshy, cylindrical or conical, 3-10 -cm. long; stems 

 glabrous as are also the leaves, 1-2 from the narrowed crown, 

 sheathed below by the dead, brown leaf bases, slender, erect, 3-8 

 dm. high (including the long naked peduncle), usually simple but 

 sometimes with one or two slender erect branches : leaves few, 

 oblong to ovate in outline, pinnate ; the segments 5-9, mostly 

 petiolulate, ovate in outline, 3-6 cm. long, pinnately or bipinnately 

 cleft or parted into linear acute segments; root-leaves 10-25 cm. 

 long, including the slender petiole which usually exceeds the 

 balde ; stem-leaves only 2-5, on successively shorter petioles: 

 umbel 5-10-rayed, with involucels of long linear bractlets : rays 

 15-25 mm. long; pedicels very short: fruit broadly elliptic, 

 5 mm. long ; lateral wings thin and as broad as the body ; the 

 dorsal and intermediate ribs thickened at base and narrowly 

 winged, with narrow intervals ; oil tubes mostly 1 (more rarely 

 2-3) in the intervals, 2-4 on the commissural side. 



Allied to P. montanus (Gray) C. & R. In fact the descriptions 



