370 
DESCRIPTION OF PLATES. 
Plate IX. QUERCUS CRASSIPOCULA, (page 365.) 
(a branch, of the natural size.) 
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 ache mum, crowned with the persistent styles. 
