FLOWERING PLANTS AND FERNS OF ARIZONA 537 



22. Seeds scarcely angled, narrowly ovoid, encircled by 4 or 5 rounded 



ridges 32. E. pediculifera. 



22. Seeds quadrangular, at most slightly wrinkled (23). 



23. Herbage with short, straight, spreading hairs; appendages as 

 narrow as the (usually) pink or red glands: Var. hirtella. 



30. E. POLYCARPA. 

 23. Herbage with appressed curly hairs; appendages usually much 

 wider than the dark purple glands__ 31. E. melaxadexia. 

 20. Plant annual (except E. arizonica with an urceolate involucre); 

 staminate flowers up to 12 or, if as many as 15, 1 pair of the append- 

 ages more than twice as long as the other (24). 

 24. Involucres urceolate; appendages essentially equal, more than twice 

 as wide as the glands (25). 

 25. Appendages entire to crenulate; hairs mostly clavate; plant 

 perennial 35. E. arizonica. 



25. Appendages deeply parted into a few attenuate segments; hairs 



tapering; plant annual 36. E. setiloba. 



24. Involucres obconic to campanulate; appendages less than twice as 

 wide as the glands, or 1 pair more than twice as long as the 

 other (26). 



26. Cyathia borne in dense axillary and terminal leafless glomerules. 



24. E. HIRTA. 

 26. Cyathia solitary or on short leafy lateral branchlets (27). 



27. Appendages (the 2 proximal ones) greatly prolonged, often con- 

 cealing the capsule 41. E. ixdivisa. 



27. Appendages (proximal and distal) without marked disparity in 



size (28). 



28. Seeds punctately pitted and mottled, depressed-truncate at 



base, sharply acute at apex; styles entire, or sometimes 



emarginate; capsule more heavily pubescent at base than 



elsewhere 42. E. stictospora. 



28. Seeds not punctately pitted or mottled, obtuse at base, not 



sharply acute at apex; styles bifid; pubescence of the 



capsule either uniform, or more abundant on the angles (29). 



29. Glands without appendages; seeds smooth; leaves entire; 



plant usually glabrous or, if not, then the pubescence 



short, straight, and spreading 40. E. micromera. 



29. Glands appendiculate; seeds variously ridged; leaves often 



serrulate; plants always somewhat covered with long and 



weak, crisped or appressed hairs (30). 



30. Seeds with sharp transverse ridges; capsules with crisped 



spreading hairs confined mainly to the external angles. 



44. E. CHAMAESYCE. 



30„ Seeds with rounded transverse ridges; capsules evenly 

 strigose 43. E. supina. 



19. Ovary and capsule glabrous (31). 



31. Leaves linear, svmmetric; herbage glabrous; plants annual, mostlv 

 erect (32). 

 32. Capsules sharply 3-angled, 1.3 to 1.4 mm. long: staminate flowers 5 

 to 12 per cyathium; involucres 0.5 to 1 mm. in diameter; delicate 

 plants with capillary ultimate branchlets (33). 

 33. Seeds smooth; involucres 0.5 to 0.7 mm. in diameter; appendages 

 usually longer than the glands; ultimate branchlets about 0.1 

 mm. in diameter; longest leaves usually shorter than 1 cm. 



33. E. GRACILLIMA. 



33. Seeds transversely wrinkled or ridged: involucre 0.9 to 1 mm. in 



diameter; appendages not longer than the glands: ultimate 

 branchlets 0.15 to 0.25 mm. in diameter; longest leaves rarely 



asshortaslcm 34. E. revoluta. 



32. Capsules roundly 3-lobed to bluntly 3-angled, 2 to 2.5 mm. long; 



staminate flowers numerous; involucres 1.4 to 2 mm. in diameter; 



plants coarser (34). 



34. Leaves entire, less than 3 cm. long; appendages narrow, never 



reddish; seeds smooth, ovoid-triangular 20. K. parryi. 



34. Leaves sharply but remotely serrulate, up to 6 cm. long; ap- 

 pendages often reddish in age, 1 to 2.8 mm. long; seeds with 

 2 (or 3) low transverse ridges, the dorsal and lateral angles 

 slightly winged 21. E. Florida. 



