Mr. Bentham's Account of two new Genera allied to Olacinese. 685 



P. orbiculatum, foliis ovato-orbiculatis obfusissimis subtus ramulisque incanis, 

 ovario hispido. 



Frutex 10-12-pedalis, divaricato-famosus. Folia 4-pollicaria, supra nitida, 

 venis utrinque 6 parallelis prominentibus. Flores fere 2 lin. longi. Fruc- 

 tum unicum nondum maturum depresso-globosum vidi. 



Dry savannahs on the Padawire river. Schomburgk, 



P. acuminatum, foliis ovatis oblongisve acuminatis subtus vix pallidioribus, 



ovario glabro. 

 Folia 3-4-poll. longa. Flores minores, laxiores quam in prsecedente. 



This is, according to Schomburgk, a tree of about 30 feet high, growing on 

 the high banks of the Rio Negro ; the flowers are pure white. Schomburgk, 

 n. 970. 



EXPLANATION OF THE PLATES. 



Tab. XLI. 



Fig. 1. A'podytes dimidiata. 



2. Flower. 



3. Ditto, laid open, showing the position of the stamina. 



4. Pistillum. 



5. Ovarium, cut vertically. 



6. Ditto, cut transversely. 



7. Mature fruit. 



8. Ditto, ditto, cut vertically, showing the seed with its albumen and 



embryo. 



Tab. XLIL 



Fig. 1 . Pogopetalum orbiculatum. 



2. Flower unexpanded. 



3. Ditto, laid open, showing the position of the stamina. 



4. Pistillum. 



5. Vertical section of the ovarium. 



6. Transverse section of ditto. 



7. Superior ovulum. 



8. Inferior ditto. 



4 u 2 



