1884.] NATURAL SCIENCES OF PHILADELPHIA. 291 



EXPLANATION OF PLATE VIL 



Fifi. 1. — Spikelet of C'/'nna pendula Trm. 



Fig. 2. — Same with empty glumes removed, and the elongated rhachilla 



behind the palea brought forward into view. 

 Fir. 3. — Spikelet of C. pendula, var. glomerula. 

 Fig. 4. — Spikelet of C. Bolanderi Scribn. 

 Fig. 5. — Same with empty glumes removed. 

 Fig. 6. — Spikelet of C. anmdinricea L. 

 Fig. 7. — A. larger spikelet of same. 

 Fig. 8. -A spikelet of C. arundinacea with empty glumes spread out, and 



the continuation of the rhachilla behind the palea brought into 



view. 

 Fig. 9. — Spikelet of C. arnndinaceri. empty glumes removed ; a, the stipe. 



