626 CONTRIBUTIONS FROM THE NATIONAL. HERBARIUM. 



Teeth of the bracts obtuse or acutish. 



Bracts glabrous or nearly so ; leaves soon glabrate. 

 Bracts about 5-dentate; leaves 7 to 10 cm. long. 



21. A. oligantha. 

 Bracts 11 to 15-dentate ; leaves mostly 3 to 5 cm. long. 



22. A. acapulcensis. 

 Bracts densely pubescent ; leaves finely pubescent beneath. 



23. A. dioica. 

 Bracts glandular-pubescent. 

 Bracts coarsely dentate, with 17 to 25 teeth. 



24. A. comonduana. 

 Bracts minutely dentate. 

 Leaves obtuse, 1 to 3 cm. long, densely pilose beneath. 



25. A. californica. 

 Leaves acute or acuminate, mostly 3 to 7 mm. long, green 



beneath and short-pilose 26. A. umbrosa. 



AA. Pistillate spikes terminal, some of them also axillary. 

 Bracts lobed to the middle or more deeply. 

 Bracts with a few short subappressed hairs, not ciliate. 



27. A. papulosa. 

 Bracts densely pilose or at least pilose-ciliate. 



Bracts glandular-ciliate 28. A. ocymoides. 



Bracts not glandular-ciliate. 



Lateral lobes of the bracts truncate 29. A. triloba. 



Lateral lobes of the bracts acuminate 30. A. foumieri. 



Bracts lobed one-fourth the distance to the base or less. 

 Stems glandular-pubescent. 



Bracts 17 to 21-dentate 31. A. adenostachya. 



Bracts 7 to 13-dentate. 



Leaves acute or acuminate 32. A. langiana. 



Leaves rounded or very obtuse at apex 33. A. pringlei. 



Stems without glandular pubescence. 



Leaf blades 1 cm. long or smaller 34. A. parvifolia. 



Leaf blades more than 2 cm. long. 

 Leaves glabrous or nearly so. 

 Bracts glabrous except for the gland-tipped hairs on the mar- 

 gins; leaves long-petiolate 35. A. deppeana. 



Bracts glandular-pubescent on the sides as well as on the 

 margins ; leaves short-petiolate. 



Bracts 7 or 9-dentate 36. A. lignosa. 



Bracts 3 or 5-dentate 37. A. laxiflora. 



Leaves copiously pubescent beneath. 

 Bracts 17 to 21-dentate. 



Leaves lance-ovate, obtusely serrate 38. A. vagans. 



Leaves broadly ovate, acutely serrate 39. A. lagascana. 



Bracts 5 to 13-dentate. 

 Ovary niuricate. 



Leaves 2 to 4.5 cm. long; petioles less than half as long 



as the blades 40. A. liebmanni. 



Leaves 8 to 17 cm. long; petioles usually more than half 

 as long as the blades. 

 Leaf blades with a pale distinct margin beneath. 



41. A. cincta. 

 Leaf blades not marginate 42. A. schiedeana. 



