742 NOTES FROM THE BOTANIC GARDENS, NO. 12, 



twice as long as the second glume, acuminate, concave on the 

 back with raised sides, empty, but with a similarly shaped shorter 

 palea. Fourth glume ovate, tapering to a fine point as long as 

 the palea of the third glume, somewhat hardened, veinless but 

 minutely rugose, with a bisexual flower and a similar but smaller 

 and thinner palea. The glumes of the second, third and fourth 

 spikelets are similar, except that the third glume is mostly longer; 

 all spikelets have a single bisexual flower, without any sterile 

 flowers, as far as we could see from the material at our disposal. 

 Styles and stamens 2. Grain, not seen. 



The grass diners in so many more or less important points from 

 Rottboellia in the sense in which Bentham defined the genus, 

 that we place it only with great hesitation in that genus. 



EXPLANATION OF PLATE LXIX. 



Rottboellia truncala. 



Fig. A. — Plant; natural size. 



Fig.B. -x 



Fig.C. > Articles of the rhachis, with groups of spikelets. 



Fig.D. ) 



Fig E \ 



„. " ' Leaf -sheath with ligule. 



Fig.F. j 



Fig.l. — First or outer glume of the spikelet. 



Fig. 2.— Second glume. 



Fig. 3. —Third glume. 



Fig. 4. — Fourth or flowering glume. 



»" " I Flowering elume with the palea. 

 Fig.6. / 



Fig. 7. —Pistil. 



Fig. 8.— Spikelet. 



Fig. 9. — Palea with pistil. 



