58 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. I26 



9. Sepals obtuse. 



22. Petals ferruginous-tomentulose outside; petal-filament tube 



only 0.5 mm. long; styles elongate; plant i m. or more high; 



leaves repand-serrate with teeth 10 mm. long; inflorescence 



simple, dense; sepals 7-8.5 mm. long; petals suberect, ecari- 



nate 21. D. ferruginea 



22. Petals completely glabrous ; petal-filament tube longer ; styles 

 usually short. 

 23. Upper scape-bracts equaling or exceeding the internodes. 

 24. Leaves short and thick, only 6-20 cm. long, but 8-35 mm. 

 wide; inflorescence simple. 

 25. Floral bracts entire, narrowly lance-triangular; inflores- 

 cence soon glabrous ; leaf-blades 25-35 ^^- wide, 

 glabrous above; sepals to 8 mm. long. 



16. D. brevifolia 



25, Floral bracts serrulate, broadly ovate; inflorescence 



densely lepidote; leaf-blades 8-10 mm. wide, cinereous- 

 lepidote on both sides; sepals 9-10 mm. long. 



22. D. simulans 

 24. Leaves long and narrow, 30-50 cm. long; inflorescence 

 often compound. 



26. Floral bracts to 25 mm. long, the lower ones equaling 



or exceeding the flowers ; spines of the leaves 1-1.5 

 mm. long. 

 27. Inflorescence compound or with buds in the axils of 

 the lower bracts ; pedicels short and stout ; petal- 

 blades suborbicular, ecarinate ; sepals 7-12 mm. long. 



23. D. trichostachya 



27. Inflorescence simple; pedicels 5 mm. long; petal- 



blades trapeziform, carinate; sepals 9 mm. long. 



24. D. eminens 

 26. Floral bracts not more than 15 mm. long, the lower 

 ones usually equaling the sepals; spines of the leaves 

 to 4 mm. long. 



28. Inflorescence brown-furfuraceous ; leaf -blades to 45 



mm. wide; sepals to 10 mm. long 25. D. frigida 



28. Inflorescence soon glabrous ; leaf-blades 17 mm. wide ; 



sepals 7 mm. long 26. D. data 



23. Upper scape-bracts shorter than the internodes. 

 29. Inflorescence covered with a dark ferruginous tomentum, 

 its axis strongly flexuous ; flowers to 18 mm. long; 

 sepals 8-1 1 mm. long; petals ecarinate; stigmas sub- 

 sessile; leaves 5 dm. long, the blades subglabrous on 



both sides 27. D. sordida 



29. Inflorescence sparsely pale-furfuraceous or glabrous. 

 30. Upper scape-bracts and floral bracts serrulate. 

 31. Pedicels short, much exceeded by the floral bracts; 

 leaves 15-40 cm. long; sepals 5-7 (rarely to 9) mm. 

 long. (Fig. 17.) 20. D. tuberosa 



