FLOWERING PLANTS AND FERNS OF ARIZONA 455 



14. Plant perennial, but flowering the first year and thus often appearing 

 annual; stems prostrate or weakly ascending, conspicuously glandu- 

 lar-punctate, pubescent; staminal tube not exserted (15). 

 15. Racemes 4 to 8 cm. long, 15 to 20 mm. in diameter; leaflets 9 to 11, 

 mostly oblong, 8 to 15 mm. long; stems merely pubescent; flowers 



purplish 13. D. lachxostachys. 



15. Racemes 1 to 5 cm. long, 10 to 15 mm. in diameter; leaflets 7 to 15, 

 obovate, 3 to 8 mm. long; stems villous; flowers white and 



purple 14. D. mollis. 



10. Flowers sessile (16). 



16. Plant annual, glabrous or glabrate; stems slender, usually erect; calyx 



lobes subulate or setaceous from a deltoid base, villous or plumose; 



color of the flowers not known for all of these species (17). 



17. Leaflets many (11 to 51), oblong or oblanceolate, truncate, often 



retuse (18). 



18. Staminal tube twice as long as the calyx; calyx tube slit dorsally to 



below the middle: spikes 3 to 10 cm. long, 12 to 14 mm. thick; 



stem erect, branching above the middle 16. D. lagopus. 



18. Staminal tube exserted, but less than twice as long as the calyx (19). 



19. Calyx tube glabrous, slit dorsally nearly to the base; bracts 



glabrous; spikes 1 to 3 cm. long, about 1 cm. thick; plant usually 



branching at base 15. D. urceolata. 



19. Calyx tube villous, not slit far below the middle; bracts pilose on 

 the margins and toward the base; spikes 2 to 5 cm. long, 8 to 

 10 mm. thick; stem erect, branching above the middle. 



17. D. LEPORIXA. 

 17. Leaflets few, 3 to 11 (20). 



20. Leaflets 3 to 5, narrowly linear or filiform, usually much longer than 

 the rachis, the latter obsolete in trifoliolate leaves; calyx copiously 



Villous 18. D. FILIFORMIS. 



20. Leaflets 3 to 11, narrowly oblanceolate or elliptic, only the terminal 

 leaflet longer than the rachis (21). 

 21. Ribs and lobes of the calyx usually very dark colored, the lobes not 

 longer than the tube; calyx tube slit dorsally to the middle. 



21. D. POLYGOXOIDE-. 



21. Ribs and lobes of the calyx not conspicuously dark colored; calyx 

 tube not slit to the middle (22). 

 22. Bracts ovate-acuminate, short-ciliate or glabrous on the margins ; 

 calyx lobes not much longer than the tube. 



19. D. BRACHYSTACHTS. 



22. Bracts lanceolate-acuminate, long-ciliate; calyx lobes often 

 twice as long as the tube and more conspicuously plumose. 



20. D. LEMMOXI. 

 16. Plant perennial (23). 



23. Spikes elongate, slender, 5 to 7 mm. thick; plant entirely herbaceous, 

 copiously pubescent except for the glabrous calyx tube; stems 

 prostrate; leaflets 7 to 15, obovate; bracts broadly obovate, abruptly 

 acuminate, conspicuously glandular-punctate; flowers purple. 



22. D. TERMIXALIS. 



23. Spikes stouter, if less than 7 mm. thick, then not elongate (24). 



24. Flowers yellow, usually drying pink; leaves and stems strigose, the 



latter entirely herbaceous from a woody caudex; calyx villous, 



the lobes setaceous from a deltoid base, plumose, longer than 



the tube (25) 



25. Leaves digitately 3-foliolate; stems usually about 10 cm. long, 



decumbent 23. D. jamesii. 



25. Leaves pinnate; leaflets 5 to 7 (26). 



26. Stems 30 to 50 cm. high, erect or nearly so, rather stout; 

 upper leaves reduced; peduncles usually 5 to 10 cm. long; 



spikes 2 to 5 cm. long, 1.5 cm. thick 24. D. a urea. 



26. Stems usually less than 30 cm. high, curved-ascending or 

 decumbent; upper leaves scarcely reduced; peduncles not 

 more than 2 cm. long, often obsolete (27). 

 27. Spikes nearly 2 cm. in diameter; bracts lanceolate, attenuate; 



leaflets usually acute 25. D. wrightii. 



27. Spikes 10 to 15 mm. in diameter; bracts ovate, short- 

 acuminate 26. D. nana. 



