Nelson : Neav Plants from Wvominc; 241 



be contrasted with the acute buds. and long, prismatic-cyHndrical 

 capsules of the smaller, perennial plant 



Cymopterus bulbosus 



■ 



Root large, clavate, increasing in diameter downward, the end 

 usually bulbous, 10-15 cm. long, 2-4 cm. in diameter in thickest 

 part : caudex very short, covered with the bases of the petioles of 

 dead leaves : leaves i or more from the caudex and several on the 

 stems (the former long petiolcd), glaucous, bipinnate, ovate in out- 

 line, 4-7 cm. long ; the pinnae also ovate, pinnatifid or toothed, the 

 ultimate segments oblong to ovate, 3-8 mm. long ; petioles with 

 expanded membranous base -: stems 1-2 from the crown, slender, 

 3-5 cm. long, giving rise at their summits to several leaves and 

 peduncles : peduncles moderately stout, at maturity 5-10 cm. long 

 and equaling or exceeding the leaves : involucre and involucels of 

 broad membranous bracts with broad greenish midrib, more or less 

 united at base : rays unequal, 8-15 mm. long, those of the aborted 

 umbellets very short ; pedicels 5-8 mm. long : fruit elliptic to oval, 

 8-14 mm. long, 6-10 mm. wide ; wings broad and thin, equahng 

 or narrower than the seed body, the dorsal or the two inter- 

 mediates occasionally not developed : oil tubes mostly 3 in the 

 intervals and 6 on the face, the two middle ones situated near the 

 inner side of the integument : seed face concave. . 



That this species may exist in the herbaria as C. viontanus 

 Nutt., is possible but no two related species are more easily dis- 

 criminated. In C. moutanus the peduncles are very short, shorter 

 than the leaves in both flower and fruit ; the leaf segments are 

 rather distant while in C. bulbosus the segments are crowded. 



L 



F 



The large bulbous termination of the root will further distinguish 

 the latter as do also the thin integument and thin wings (which 

 are scarcely thickened at the base) in contrast with the conspicu- 

 ously thickened integument and base of the wings of the other. 

 If more points arc needed the habitat is also discriminative. C, 

 moutanus is of the open plains of the Rocky Mountain region in 

 general while the other seems to be confined to naked, clay soil, 

 such as occurs in the ravines and slopes among the Green River 

 shales. Type specimen in Herb. University of Wyoming, no. 



