101 



Fig. 75. Campulosus aromaticus (Walt.) Trin. (Ctenium americanum Spreng.) . 

 TOOTHACHE-GRASS.— a, Empty glumes of a spikelet; b, a spikelet with the 

 outer empty glumes removed. Fig. 179 in Bui. 7 illustrates another species of 



Campulosus. 



75. CAMPULOSUS Desv. Nouv. Bui. Soc. Philom., 2: 189. 1810. (Ctenium 

 Panzer 1814.) Spikelets 2- to 5- flowered; the lower hermaphrodite, the others 

 staminate or imperfect; rachilla articulated above the empty glumes. Empty 

 glumes 2, at the base of the spikelets, unequal; the 1st small and sub-hyaline, 

 the 2d larger, somewhat rigid, acute, or shortly 2-toothed, with a stout divergent 

 awn on the back; glume of the hermaphrodite flower with a very slender awn 

 below the apex and densely ciliate toward the base, 3-nerved. Stamens 3. 

 Styles distinct; stigmas plumose. Rather tall grasses, with narrow leaves, and 

 usually solitary, terminal, more or less curved, one-sided spikes. 



Species 11, eight American, the others in the Eastern Hemisphere. 



