204 Mr. Schomburgk on the Snake-nut Tree, 



sparely flowered; the calyx is imbricated, the corolla has 3 

 petals_, ovate and concave, and is of a lilac colour. 



What is most remarkable is however the fruit, a thin cori- 

 aceous drupa, with a smooth nut, the kernel of which resem- 

 bles a snake most strikingly. 



It is covered like the walnut with a membrane ; the embryo 

 is roundish ; the head of the snake becomes a claviform radicle, 

 and the tail (Mirbel's scapellus or DeCandoUe's ^ tigelle ') 

 bears two large foliaceous cotyledons, with several nerves, 

 depressed, plaited, and applied to the radicle ; the colour of 

 the embryo and cotyledons is white, but the nerves of the 

 latter are of a lake colour ; as soon as exposed to the air they 

 change into a dark -brown. When the fruit is about to ger- 

 minate, the scapellus or Higelle' bends towards the base of the 

 cotyledons, bursts the nut, and having made room for the 

 seed-lobes, they unfold and take an erect situation, while the 

 rhizoma has sent its roots into the earth. 



No trials have been made whether the tree or its fruit pos~ 

 sess any medicinal properties : as already observed, the re- 

 semblance of a snake has induced the populace to consider it 

 an antidote for snake-poison. The tree appears to be peculiar 

 to the lower part of the river Essequibo and its tributaries, 

 at least it has not as yet been found anywhere else. It blos- 

 soms in March and April, and its fruit comes to maturity in 

 November. 



The above figure exhibits the appearance of the embryo after the outer 

 shell has been removed : a, is the radicle or rhizoma ; J, the neck, tigelle, or 

 collet ; c, the two cotyledons, which have been unfolded, as they are other- 

 ■wise applied to d r/, and partly surround the embryo. 



The figures in Plate III. represent the Nut and its snake-like Kernel. 



