December 17, 1910 



US 



Perennial 

 Stems leafy at base; leaves linear, shorter than 

 the stems 

 Leaves flattened, their sheaths auriculate; flow- 

 ers numerous 2. J. interior 

 1 eaves terete; flowers 1-5. one subsessile, the 

 others pedicellate 6. J. Parryi 

 Stems scapiform; basal sheaths always bladeless 

 Stamens 3; capsule trigonus-obovoid 5. J. effusns 

 Stamens 6 



Subepidermal fascicles present; stems there- 

 fore sulcate 

 Perianth segments 4-5 mm. long, conver- 

 gent about the prismatic acute capsule 3. J. textilis 

 Perianth segments 3111111. long, acute, diver- 

 gent about tlie sub-lobose capsule 4. J. patens 

 Subepidermal fascicles absent; stems smooth 

 or finely striate 

 Stems with medulla; perianth 3-4 mm. long 7. J. balticus 

 Stems mostly fistulous; perianth 5-6mm. long 8. J. Lesueurii 

 Stems scapiform, often more or less compressed, 

 the uppermost basal sheath mostly bearing a 

 scapiform blade 7a. J. balticus mexicanus 



1!. Flowers bracteate only at the base of the short pedicel. Eprophyllati 

 Perennial 

 Lowest floral bract apparently continuous with 

 the stem; inflorescence pseudo-lateral 

 Capsule trigonus-subglobose 

 Capsule trigonus-ovate 

 Inflorescence manifestly terminal 

 Leaves septate 

 Leaves ensiform, the edges toward the com 

 pressed stem 

 Stems wingless; styles long-exse; t 

 Stems narrowly winged; inflorescence 

 anthel.it.- 

 Heads discrete; styles long 11. J. oxymeris 



Heads numerous, more condensed; 

 st\ les short 1 3. |. xiphioides 



Leaves terete, fistulous, completely septate 



Meads conglomerate, densely 30-80- 



flowered i.j. J. Torre) i 



Heads small, discrete. 6-IO-flowered 

 Stems smooth, or finely striate 17. |. dubius 



Stems and leaves transversely rugose 18. J. rugulosus 

 Leaves gramineous, obscurely septate 

 Inflorescence a single terminal, [0-20- 

 flowered head 15. J. Mertensianus 



9. J. acutus sphaerocarpus 

 10. J. Cooperi 



12. j. phaeocephalus panic- 

 [ulatus 



