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, acute.............. 6. HE. abertianum. 
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 flat- 
topped cyme; perianths 3mm. long.. 8 EF. 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. polycladon. 
Plants widely and densely diffuse, 
about 10 cm. high; flowers paler 
and smaller.............02-2+-- 10. E. densum. 
Involucres glabrous. 
Bracts of the inflorescence leaflike. 
Stems and leaves glabrous; leaves tapering to 
the flat margined petioles; peduncles 
filiform...........-.-- eee eee eee ee eee 11. FE. 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 tv 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. wetherillu. 
Perianth white or pimk; pedicels filiform 
or stout. : 
Pedicels filiform; plants tall, erect, 20 
to 50 cm. high................- 16. FE. subreniforme. 
Pedicels stout; plants low, spreading, 
less than 15 cm. high............ 17. E. rotundifolium. 
