FLOWERING PLANTS AND FERNS OF ARIZONA 653 



7. Cymopterus purpureus S. Wats., Amer. Nat. 7: 300. 1873. 



Aulas per mum purpureum (S. Wats.) Coult. and Rose, Contrib. 

 U. S. Natl. Herbarium 7: 178. 1900. 



Apache County to northwestern Mohave County, 4,000 to 6,500 

 feet. Southwestern Colorado, southern Utah, northwestern New 

 Mexico, and northern Arizona. 



Cymopterus jonesii Coult. and Rose (Aulosper mum jonesii Coult. and Rose), of 

 southwestern Utah, may be found in Arizona. 



23. PTERYXIA" 



Plants perennial from a slender taproot, caulescent, glabrous; 

 leaves few, remote, narrowly oblong, bipinnate, the segments linear, 

 acute, distinct; peduncles exceeding the leaves; umbels compound; 

 involucre absent; bractlets of the involucel inconspicuous, linear; 

 calyx teeth conspicuous, persistent; corolla yellow; stylopodium 

 absent; fruit ovate to ovate-oblong, 4.5 to 7 mm. long, compressed 

 dorsally, the lateral and dorsal wings linear in cross section, the oil 

 tubes 3 to 8 in the intervals, 5 to 15 on the commissure, the seed face 

 somewhat concave. 



1. Pteryxia petraea (M. E. Jones) Coult. and Rose, Contrib. U. S. 

 Natl. Herbarium 7: 172. 1900. 



Cymopterus petraeus M. E. Jones, Contrib. West. Bot. 8: 32- 

 1898. 



Both rims of the Grand Canyon (Cook and Johnson 2063, Eastvjood 

 5833, Eastwood and Howell 1006). Southern Idaho and southeast- 

 ern Oregon to northern Aiizona and California. 



24. PSEUDOCYMOPTERUS 5 * 



Plants perennial with a long slender taproot, acaulescent or caules- 

 cent, glabrous or pubescent ; leaves pinnate to tripinnate, the segments 

 filiform, linear, or lanceolate, short or elongate; peduncles exceeding 

 the leaves, hirtellous at base of the umbel; umbels compound; in- 

 volucre mostly absent; bractlets of the involucel usually conspicuous; 

 calyx teeth conspicuous; corolla purple or yellow; stylopodium absent ; 

 fruit oblong to ovate-oblong. 3 to 7 mm. long, compressed dorsally 

 or subterete, the lateral wings present, the dorsal wings similar to the 

 laterals or absent through abortion, the wings mostly thin, sublinear 

 in cross section, the oil tubes 1 to 8 in the intervals, 2 to 8 on the 

 commissure, the seed face slightly concave. 



Key to the species 



1. Stems naked or few-leaved; young fruit glabrous; mature fruit ovate to ovate- 

 oblong, 3 to 7 mm. long, 2 to 4 mm. wide 1. P. MONTANUS. 



1. Stems mostly many-leaved; young fruit puberulent; mature fruit oblong, 3 to 

 ■4 mm. long, 1 to 2 mm. wide 2. P. DAVIDSON!. 



Reference: See footnote 97, p. 649. 



