32 Contribution* to Western Botany. 



the type, the ribs are very variable, and in some specimens 

 winged ^ as high as the lateral wings, in others they are not 

 raised though there are traces of delicate papery prolongations. 

 The writer would not be at all surprised to find that this is the 

 long lost C. campestris Nutt., but a comparison with the type 

 is impossible at present. 



Cymopterus calcareus n. sp. Proper stems with inter- 

 nodes usually less than the imbricated leaf-sheaths which are 

 about an inch long, occasionally the upper internode is 2 to 3 

 inches long and slender, stems tufted at the apex of a long, 

 branching, rather slender root; glabrous; leaves tripinnate, 

 ultimate segments 1 to 2 lines long, broadly linear, barely cus- 

 pidate, outline of leaf ovate, and about 6 inches long, petiole 

 rather long; slender peduncles about a foot long, sub- 

 scapose; flowers yellow; rays unequal, 1 to 1^ inches long, 

 many; involucres none; involucels of several minute, subulate 

 bracts; slender pedicels about 2 lines long; fruit oblong, 3 lines 

 long, emarginate at both ends, wings widest below, about % line 

 wide, intermediate ones very much reduced above, often barely 

 more than a ridge, but well developed below and like the rest 

 thin; oil tubes 3 to 5 in the intervals, about 6 on the commis- 

 sure. Seed sulcate rather deeply. 



This seems to differ sufficiently from C. terebinthinus. Of 

 the latter I have much material but cannot place this with it. 

 Green River, Wyo., 6000 ft. alt., June 23, 1896. Carter, Wyo., 

 June 25, 1896, in clay soil. What appears to be the same thing 

 is from Carson City, Nev., June 2, 1897. 



Cymopterus petrous, n sp. with the habit of the last, but 

 growing on rocks in tufts, more slender; leaves linear, bipinnate 

 divisions distant, very small, nearly linear, acute; petioles, 

 sheaths and stems like the last; rays slender, few, unequal, 2 

 inches or less long; pedicels 2 lines long, bracts of the involu- 

 cels small and narrow; fruit about 4 lines long and a line wide, 

 narrowly-oblong, wings tbin, very narrow, barely half as wide as 

 the seed, intermediate wings rudimentary but always raised; oil 



