54 
S3. Trasus. 9. CYPERACEAE. 
PI. end . ph. 
b. Bractece leaflike ; fruit downy ; 
spikes sessile , or with sheathed footstalks. 
Male spike 1 ; female 2 or 3 ; 
bractece sheathing T. prcecox. 5 . 
Male spike 1 ; female 2 or 3 ; glume short; 
hractece amplexicaul ; culm upright T. tomentosus . 6. 
Male spike 1 ; female 2 or 3; glume long; 
hractece amplexicaul; culm lying down . . T. piluliferus. 7. 
Male spikes 2 ; female 3, cylindrical, brown ; 
fruit hirsute; plant hairy . . T. hirtus. 8. 
Male spikes 2; female 2, ovate, oblong, black; 
fruit woolly ; plant smooth T.fliformis. 9. 
c. Bractece leaflike ; fruit smooth ; 
spikes sessile , or with a footstalk enclosed in a sheath. 
Bractece amplexicaul ; culm, acute-angled ; 
fruit inflated, beaked T. vesicarius. 10. 
Bractece amplexicaul ; culm obtuse-angled ; 
fruit inflated, beaked T. ampullaceus. 1 1 . 
Bractece sheathing ; culm smooth ; 
fruit beaked, beaks recurved T.flavus. 12. 
Bractece sheathing ; culm smooth ; 
fruit beaked, beaks straight T. Oederi . 1 3. 
d. Bractece leaflike , sheathing ; fruit smooth ; 
spikes upright , upper ones sessile , lower footstalked 
exserted , male 1. 
Fruit beaked, 2-cut ; glume 3-ribbed ; sheath short ; 
culm smooth ; ligida 0 T. extensus. 14. 
Fruit beaked, 2- toothed; glume 1 -ribbed; sheath long; 
culm smooth; ligula long, acute T. Hostianus. 15. 
Fruit beaked, 2-toothed; glume 1 -ribbed; sheath long; 
culm rough; ligula 0 T.fulvus. 16. 
Fruit beaked, 2-cusped; glume 3-ribbed ; sheath long; 
culm smooth; ligida short, blunt. T. distans. 17. 
Fruit beaked, 2-lobed, 2-ribbed; glume 1 -ribbed; 
sheath long; cidm smooth; ligula 0 T. binervis. 18. 
Fruit obtuse, not nicked ; root creeping ; 
sheath long ; culm smooth T. paniceus. 19. 
Fruit beaked, scariose, not nicked ; root fibrous ; 
sheath short ; cidm smooth T. depauperatus. 20. 
