WOOTON AND STANDLEY FLORA OF NEW MEXICO. 



183 



Fruit merely angled, never winged; perennials or annuals. 

 Annuals. 



Involucres pubescent. 



Basal leaves linear or linear-oblanceolate; involucres 



on glabrous peduncles 15 to 50 mm. long 5. E. pharnaceoides. 



Basal leaves broadly oblong, ovate, or orbicular; 

 peduncles less than 15 mm. long, more or less 

 pubescent. 

 Valves cordate at the base, orbicular or nearly 

 so; plants not densely white- tomentose. 

 Perianth yellow, tinged with red; stems 10 

 to 20 cm. high, much branched at the 

 base; lobes of the involucre triangu- 

 lar to lanceolate, a cute 6. E. ahertianum. 



Perianth white, tinged with pink; stems 

 tall, 30 to 50 cm . , sparingly branched, 

 usually simple at the base; lobes of 

 the involucre oblong or spatulate, 



mostly obtuse 7. E. pinetorum. 



Valves tapering to the base, spatulate or 

 obovate; plants densely white- tomentose. 

 Stems simple below, ending in a fiat- 

 topped cyme; perianths 3 mm. long. . 8 E. annuum. 

 Stems much branched throughout, the 

 inflorescence of many slender secund 

 racemes; perianth 1.5 mm, long or 

 less. 

 Plants erect, 30 to 50 cm. high; flowers 



bright rose pink 9. E. polydadon. 



Plants widely and densely diffuse, 

 about 10 cm. high; flowers paler 



and smaller 10. E. densum. 



Involucres glabrous. 



Bracts of the inflorescence leaflike. 



Stems and leaves glabrous; leaves tapering to 

 the flat margined petioles; peduncles 



filiform 11. E. salsuginosum. 



Stems and leaves more or less pubescent; leaves 

 abruptly contracted into the terete 



petioles; peduncles stout 12. E. divaricatum. 



Bracts of the inflorescence scalelike. 



Peduncles abruptly reflexed in age; leaves 

 extending up the stems 5 to 10 cm.; 



flowers white 13. E. cernuum. 



Peduncles erect or ascending, never reflexed; 

 leaves basal; flowers white or colored. 

 Perianth yellow; pedicels filiform. 



Leaves not tomentose 14. E. trichopodum. 



Leaves tomentose beneath 15. E. wetherillii. 



Perianth white or pimk; pedicels filiform 

 or stout. 

 Pedicels filiform; plants tall, erect, 20 



to 50 cm. high 16. E. subreniforme. 



Pedicels stout; plants low, spreading, 



less than 15 cm. high 17. E. rotundi/olium. 



