74 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 1 26 



16. Leaf-sheaths not distinct from the narrowly triangular 

 blades; floral bracts shorter than the sepals. (Fig. 24.) 



12. T. geminifiora 

 16. Leaf-sheaths distinct from the linear blades; floral bracts 



about equaling the sepals 13. T. globosa 



13. Inflorescence simple; flowers usually in more than 2 ranks (only 



2 in varieties of T. pulchella and T. stricta). 



17. Sepals free or equally short-connate; plants generally stemless 



or short-caulescent (sometimes long-caulescent in T. pohliana). 



18. Sepals glabrous, lanceolate or lance-ovate. 



19. Leaves covered with coarse spreading scales, 3-4 cm. long. 



14. T. sprengeliana 

 19. Leaves covered with appressed scales, 6-18 cm. long. 

 20. Scape very short, hidden by the leaves ; leaves rigid, curved 

 and often secund, acuminate but subpungent. 



15. T. rosea 

 20. Scape evident; leaves flexible, not much curved, filiform- 

 acuminate. (Fig. 25.) 16. T. stricta 



18. Sepals lepidote. 

 21. The sepals coriaceous, thick, suborbicular. . . 17. T. pohliana 

 21. The sepals membranaceous; lance-ovate. 



18. T. meridionalis 



17. Sepals much more highly connate posteriorly than anteriorly; 



plants in general strongly caulescent. 



22. Leaf -blades slender (about 20 times as long as wide), or if 



robust then strongly secund, rather flexible; inflorescence 



few-flowered ; petals white to pale blue. 



23. Scape exceeding the short stout strongly secund leaves ; 



petals to 30 mm. long 19. T. araujei 



23. Scape usually shorter than the slender leaves ; petals not 



over 20 mm. long 20. T. pulchella 



22. Leaf-blades stouter (about 10 times as long as wide), scarcely 

 if at all secund, 5-13 mm. wide, rigid ; inflorescence 5-20- 

 flowered ; petals usually dark blue, 17-27 mm. long. 



21. T. aeranthos 

 3. Stamens deeply included ; style short and stout ; leaf -blades narrowly 

 triangular or linear in the Brazilian species. (Figs. 27, 28.) 

 24. Petal-blades broad, conspicuous ; sepals 10-30 mm. long in the Bra- 

 zilian species. (Fig. 27.) Subgenus Phytarrhiza 



25. Scape completely covered by its bracts ; leaves in more than 2 ranks. 

 26. Floral bracts 20-40 mm. long; inflorescence simple; plant stem- 

 less. 

 27. Flowers imbricate at and after anthesis. 

 28. Floral bracts coriaceous, glabrous, to 4 cm. long; inflores- 

 cence elliptic, 55 mm. wide ; leaf-sheaths red-striate ; leaf- 

 blades 7-12 mm. wide. (Fig. 26.) 22. T. anceps 



28. Floral bracts membranaceous, lepidote, about 2 cm. long; 

 inflorescence narrowly lanceolate, 6-10 mm. wide; leaf- 

 sheaths concolorous ; leaf-blades 1-2 mm. wide. 



23. T. linearis 



