PEDICELED ONE-FLOWERED SPIKELETS 51 



In Stipa (Fig. 45) and Aristida (Fig. 46) the palea 

 is entirely inclosed in the lemma. The callus (see 



Fig. 44. A, glumes, 

 and B, floret of Ory- 

 zopsis racemosa. 



Fig. 45. A, glumes, 

 and B, floret of Stipa 

 spartea. 



Fig. 46. Spikelet of 

 Aristida dichotoma. 



page 22) is developed into a needle-like point that 

 readily penetrates clothing or works its way into the 

 wool of sheep. 



