494 MISC. PUBLICATION 200, U. S. DEPT. OF AGRICULTURE 



1-nerved, the second about as long as the lemmas, firm, 3- to 4-nerved, 

 bearing on the back a strong divergent awn ; lemmas rather papery, 3- 



nerved, with long hairs on the lat- 

 eral nerves and a short straight 

 or curved awn on the back just 

 below the apex, the first and 

 second lemmas empty, the third 

 enclosing a perfect flower, the 

 upper 1 to 3 empty and succes- 

 sively smaller. Erect, slender, 

 rather tall perennials, with us- 

 ually solitary, often curved 

 spikes. Type species, Ctenium, 

 carolinianum Panz. (O. aro- 

 maticum,). Name from Greek 

 Tetenion, a little comb, alluding 

 to the pectinate arrangement of 

 the spikelets. 



Plants forming dense tussocks ; second 

 glume with a row of prominent 

 glands on each side of the mid- 

 nerve; awn stout, at maturity 

 horizontal or nearly so; ligule 

 about 1 mm long 



1. C. AROMATTOUM. 



Plants with slender scaly rhizomes; 

 second glume glandless or with 

 obscure glands; awn rather slen- 

 der, not horizontally spreading; 

 ligule 2 to 3 mm long 



2. C. FLORIDANUM. 



1. Ctenium aromaticum 



(Walt.) WOOD. TOOTHACHE 

 GRASS. (Fig. 1052.) Culms 1 

 to 1.5 m tall, the old sheaths per- 

 sistent and fibrillose at base; 

 ligule about 1mm long; blades 



FIGURE 1050. Spartina patens. Panicle, X flof nr involute 

 1; spikelet, X 5. (Killip 6359, Md.) nat OF involute 



15 cm long; spikelets 5 to 7 mm 



long. 01 (Ctenium carolinianum Panz.) Wet pine barrens, Coastal 

 Plain, Virginia to Florida and Louisiana (fig. 

 1053). The roots spicy when freshly dug. 

 Furnishes fair cattle forage in moist pine bar- 

 rens* of Florida. 



2. Ctenium floridanum (Hitchc.) Hitchc. 

 (Fig. 1054.) Differs from C. aromaticum in 

 having creeping scaly rhizomes, ligule 2 to 3 

 mm long, second glumes with longer, more 

 slender awns and without glands or with only 

 obscure ones. 21 (Erroneously referred by American authors to 

 Campulosus chapadensis Trin.) Moist pine barrens, Florida. 



