84 GERAXIALES 



'Plants prostrate. 6. E. albicaulls. 



Plants erect or ascending. 

 Appendages of the glands conspicuous, white. 



1. E. petaloidea. 

 Appendages of the glands greenish-white or obsolete. 



2. E. flagelliformis. 

 Leaves broader mostly less than 1 cm. lo*ag. 

 Seeds smooth. 

 Leaves oblong, 4-12 mm. long. 3. E. geyeri. 



Leaves orbicular, ovate or oval, 2-6 mm. long. 



4. E. serpens. 

 Seeds wrinkled. 10. E. fendleri. 



Leaves serrate or dentate. 

 Glabrous or nearly so. 



Plants prostrate or spreading, leaves 4-15 mm. long. 



Seeds strongly transversely wrinkled. 7. E. glyptosperma. 

 Seeds pitted or irregularly and faintly wrinkled. 



5. E. serpyllifolia. 

 Plants erect or ascending, leaves 10-30 mm. long. 



11. E. nutans. 

 Puberulent or pilose. 



Involucres entire, seeds 0.4 mm. long. 8. E. macuiata. 



Involucres split on one side, seeds 1 mm. long. 



9. E. humistrata. 

 Leaves equilateral, the bases not oblique. 



Herbage glabrous, stems striate angled. 12. E. hexagona. 



Herbage pubescent. 



Leaves linear or linear-lanceolate. 15. E. cuphosperma. 



Leaves broader. * 16. E. dentata. 



Leaves, at least some of them, alternate or scattered; plants erect op 

 ascending. 

 Stems topped by an umbel, which is subtended by a whorl or verticil- 

 ate leaves, leaves sessile or nearly so. 

 Leaves entire. 



Upper leaves white margined. 14. E. marginate. 



Upper leaves not white margined. 



Leaves over 2 cm. long. 13. E. corollata. 



Leaves mostly less than 2 cm. long, the lower scaly. 

 Rays of the umbel 3-5 subtended by few bracts. 



21. E. robusta. 

 Rays of the umbel many, subtended by many bracts. 



20. E. cyparissias. 

 Leaves serrulate. 



Styles erect, longer than the ovary, 2-cleft to the middle. 



18. E. obtusata. 

 Styles spreading, shorter than the ovary, slightly 2-cleft. 



19. E. missourlensis. 

 Stems not topped by an umbel, no verticillate leaves, leaves slender 

 petioled. 

 Leaves linear or linear-lanceolate. 15. E. cuphosperma. 



Leaves broader. 



