86 



FIRST BOOK OF GRASSES 



spreading panicle (Fig. 78, D) which disarticulate 

 obliquely below the raceme, the line of articulation 

 bordered by a dense brush of hairs (Fig. 78, C). The 



Fig. 78. A, one-jointed raceme of Fig. 79. A, single joint of raceme 



Rhaphis pauciflora; B, base of 

 raceme and summit of branch; 

 C, hairy summit of branch from 

 which raceme has fallen; D, in- 

 florescence. 



of Heteropogon contortus; B, per- 

 fect spikelet from which sterile 

 spikelet has fallen ; C, base of fer- 

 tile spikelet and its callus; D, ra- 

 ceme; E, diagram of raceme; 

 F, diagram of rachis and pedicels 

 of four joints of raceme. 



sterile spikelets with their pedicels fall off before the 

 maturity of the perfect spikelet, which, with its 

 hairy callus and long awn, closely resembles a mature 

 floret of Stipa (Fig. 45). 



