57 2 Bicknell : Studies in Sisyrinchium 



Leaves less than half the height of the scape ; roots much thickened. 



6. S. radicatum. 

 Leaves equalling the scapes or nearly so ; roots fibrous, never greatly thick- 

 ened. 



Capsules large, 6-7 mm. long. 



Leaves mostly smooth edged ; peduncles stout and stiff. 



7. S. macrocarpon. 

 Leaves sharp-serrulate ; peduncles very long and slender. 



8. S. longipediinadatum. 

 Capsules smaller, 3-5 mm. long. 



Sides of leaves and stem scabrellous ; pedicels slenderly flexuous. 



9. S. pruinosum. 



Sides of leaves and stem smooth (sometimes roughened in Nos. 10, 



18 and 20); pedicels not widely flexuous. 

 Bracts of spathe becoming thickened and strongly rather few- 

 nerved, the mature spathe rather broad and turgid. 



10. S. Texanum. 

 Bracts of spathe closely many-nerved. 



'Plants very pale green and glaucous, mostly stiff. 



Edges of leaves and stem normal rough or serrulate ; 

 values of capsule with lateral nerves. • 



11. S. ensigerum. 

 Edges of leaves and stem normally smooth; valves of 



capsule without lateral nerves. 

 Leaves mostly 2-4 mm. wide; perianth 12-15 

 mm. long, column 6-8 mm. long. 



12. S. amcthyUiniun. 



Leaves mostly 1-2 mm. wide ; perianth 7-10 mm. 

 long, column about 5 mm. high. 



13. S. demissum. 



Plants not very pale and glaucous or usually turning dark 



or discoloring when dry. 

 Leaves mostly over 2 mm. wide ; plants 1 5-30 mm. 



high. 

 Glaucous to glaucescent ; scape narrowly firm- 

 winged ; perianth light blue ; pedicels exserted. 



14. S. varians. 



Green to glaucescent ; scapes narrowly firm- 

 winged ; parianth deep blue-purple ; pedicels 

 scarcely exserted. 15. .5". amoefiam. 



Green; scape broadly thin- winged ; pedicel- 

 slenderly exserted and spreading. 



16. S. graminoides. 



Leaves mostly under 2 mm. wide; plants 5-20 cm.high. 

 Plants green to glaucescent, becoming more or 



less dark when dry. 

 Scapes rigid, somewhat curved ; perianth 



bright blue ; ovary glabrous. 



17. S. Brayi. 



