Bush — The Texas Tradescantias. 183 



ANALYSIS OF 8PBCIBS. 



Leaf blades linear or linear-lanceolate, 12-50 times longer than broad, more 

 or less involutely folded. 

 Stems short, 1-10 cm. long; bracts of the involucre mostly longer than 

 the leaf blades. 

 Stems and leaves long-villous. 1. T. brbvicaulis. 



Stems and leaves roughish-pubescent. 2. T. hirsutiflora. 



Stems and leaves appressed-pilose. 3. T. subacaulis. 



Stems 1-10 dm. lonsj; bracts of the involucre mostly shorter than the 

 leaf-blades. 

 Sheaths not imbricated at the base of stem. 



Plants bright green; pedicels villous or glandular pilose; sepals 

 villous or pilose, becoming membranous. 

 Stems villous; pedicels villous. 4. T. australis. 



Stems glabrous; pedicels glandular pilose. 



5. T. OCCIDENTALIS. 



Plants glaucous; pedicels glabrous, glandular-pubescent or 

 velvety ; sepals often with a tuft of hairs at apex, leathery. 

 Pedicels glabrous; bases of the in volucral bracts not sac- 

 like. 



Stems tall, robust; sepals glabrous, with a tuft of 



villous hairs at apex. 6. T. reflexa. 



Stems medium height, slender, much branched ; umbels 



numerous; sepals smooth. 7. T. scopulorum. 



Stems low, very slender, simple, unbranched; umbel 



single; sepals smooth. 8. T. Wrightii. 



Pedicels pubescent. 



Pubescence glandular; bases of the involucral bracts 

 not sac-like. 9. T. vaginata. 



Pubescence velvety; bases of the involucral bracts con- 

 spicuously sac-like. 10. T. gigantea. 

 Plants yellowish-green. 



Stems hirsute with spreading brownish or whitish hairs. 



11. T. HIR8UTICAULI8. 



Stems densely appressed-pilose. 12. T. Rkverchoni. 



Sheaths much imbricated at the base of the stem. 

 Stems erect. 



Minutely roughish-pubescent and glandular. 



13. T. intermedia. 

 Conspicuously roughish-pubescent; not glandular. 



14. T. EQLANDULOSA. 



Stems diffusely spreading. 



Stems scabrous-pubescent; leaf blades broader and 



longer than involucral bracts. 15. T. humilis. 



Stems appressed-pilose; involucral bracts broader and 



shorter than the leaf-blades. 16. T. Texana. 



Stems roughish-pubescent; involucral bracts broader and 



much longer than leaf-blades. 17. T. diffusa. 



Leaf blades ovate to lanceolate, 2-10 times longer than broad, flat. 



18. T. MICRANTHA. 



