370 DESCRIPTION OF PLATES. 



Plate IX. QUERCUS CRASSIPOCULA, (page 365.) 



(a branch, of the natural SI2E.) 



Fig. 1. A leaf from a young shoot. 



Plate X. BOUTELOUA (CHONDROSIUM) POTYSTACHYA, (page 366.) 

 (an entire plant, of the natural size.) 



Fig. 1. Aspikelet; magnified. 



Fig. 2, The superior glume. 



Fig. 3. Inferior palea of the perfect flower ; magnified. 



Fig. 4. Superior palea of the same ; equally magnified. 



Fig. 5. Sterile flower ; also magnified. 



Fig. 6. The achenium, crowned with the persistent styles. 



