FLOWERING PLANTS AND FERNS OF ARIZONA 691 



1 1 . Leaf blades narrowly linear; umbels sessile or nearly so; hoods 



equaling the anthers, not toothed in front; pods not striate; 



stems slender, 10 to 20 cm. long 10. A. cutleri. 



10. Leaf blades conspicuously white-ciliate with curved hairs, at 

 least when young; umbels terminal, usually sessile or nearly 

 so and appearing involucrate (closely subtended by 2 to 4 

 long leaves) ; hoods nearly equaling to much surpassing the 

 anthers (12). 



12. Stems 5 to 15 cm. long; umbels mostly more than 10-flowered; 



corolla lobes oblong-ovate, 4.5 to 6 mm. long; hoodb quad- 

 rangular-ovate, subauriculate near the base, the horn 

 broadly triangular with a somewhat exserted subulate tip. 



11. A. IXVOLUCRATA. 



12. Stems 2.5 to 5 cm. long; umbels 3- or 4-flowered; corolla lobes 

 broadly ovate, 3 to 4 mm. long; hoods strongly cucullate, 

 with an orbicular body and triangular wings nearly as 

 large as the body, the whole structure much broader than 

 high, the horn represented by a broadly ovate plate some- 

 what shorter than the body of the hood. . 



12. A. UXCIALIS. 



Leaf blades more than 15 mm. wide, lanceolate-oblong or broader, usually 



less than 3 times as long as wide (13). 

 13. Anther wings broadest considerably above the base; umbels all lateral; 

 hoods at least 3 times as long as the anthers, about 8 mm. long, 

 strongly compressed laterally, the lower portion stalklike, the 



apical portion dilated 13. A. xyctagixifolia. 



13. Anther wings broadest at base; umbels usually both terminal and lat- 

 eral; hoods not stalklike below (14). 

 14. Leaf blades acutish to acuminate at apex (15). 



15. Pods bearing soft, subulate processes, densely tomentose; hoods 

 9 mm. or longer, attenuate-acuminate, 4 or more times as long 

 as the anthers; corolla lobes purple, 8 to 10 mm. long. 



14. A. SPECIOSA. 



15. Pods without subulate processes; hoods not attenuate-acumi- 

 nate (16). 

 16. Leaf blades acute or acutish, the margin not cartilaginous or 

 erose-denticulate; corolla-lobes purplish; hoods 5 to 6 mm. 



long;, 2 to 3 times as long as the anthers 15. A. hallii. 



16. Leaf blades cuspidate-acuminate, the margin cartilaginous and 

 erose-denticulate; corolla lobes pale green; hoods 3 to 4 mm. 

 long, not more than 1.5 times as long as the anthers. 



16. A. EROSA. 



14. Leaf blades obtuse, truncate, or refuse, often mucronate at apex (17). 



17. Leaves 2 to 4 pairs, broadly ovate to suborbicular, or even wider 



than long; stems seldom more than 20 cm. long (18). 



18. Stems 10 cm. long or shorter, the plant often subacaulescent; 



leaves mostly crowded near the base of the stem, lanate- 



tomentose at least when young; peduncles longer (often 



much longer) than the leaves; corolla lobes purplish, the 



lobes 4 to 5 mm. long; hoods purplish, much surpassing the 



anthers 17. A. xummflaria. 



18. Stems commonly 15 to 20 cm. long; leaves well distributed along 



the stem, glabrous or ciliolate; umbels sessile or short- 

 peduncled; corolla lobes pale yellow, about 10 mm. long; 

 hoods pink, shorter than to barely surpassing the anthers. 



18. A. cryptoceras. 

 17. Leaves usually more than 4 pairs; stems seldom less than 30 cm. 

 long (19). 



19. Stems and leaves more or less villous with delicate, flaccid, 



pluricellular hairs; hoods about 3 times as long as the anthers, 



7 mm. long, with a thin oblique attenuate tip: leaf blades 

 very large, up to 25 cm. long and 15 cm. wide; corolla lobes 



8 to 10 mm. long- 19. A. lemmoni. 



19. Stems and leaves puberulent or glabrate; hoods not more than 



twice as long as the anthers, 3 to 4 mm. long, not attenuate 

 at apex, their sides petaloid, whitish or yellow (20 , 



