106 PRINCIPLES OF BOTANY, &c. 
brittle (fragile). The seed. contained in the nut. is 
called the kernel (xucleus), We remark likewise 
whether the nut is two or three-sided, (d/,, vel tri- 
sperma), ox whether it is divided into cells, namely, 
two, three, or many-celled, (b/, tri, vel multilocu- 
faris). 
§ 104. 
The pRupz, (drupa), 1s a nut which is covered. 
avith a thick, fleshy, succulent or cartilaginous coat. 
The following are its varieties : 
1. Berried, (4accata), when it is surrounded by a 
yery succulent coat; as in the cherry, Prunus ce- 
easus; the plumb, Prunus domestica; Peach, Amyg- 
dalus Persica; Apricot, Prunus Armeniaca, &c. 
2. Fibrous, (fbrosa), when instead of a fleshy it 
has a fibrous coat, as in the cocoa-nut, Cocos Nu 
ciferd. 
3. Dry, (exsucca), when mstead of a fleshy coat, 
it is covered with a spongy, membranaceous or coria- 
ceous substance, as in the walnut, Juglans regia ; 
almond, simygdalus communis; Tetragonia expansa, 
Sparganium. | 
4, Winged, (alata), when the Drupa has a mem. 
ei a rim, which 1s called a wing, as in Ha- 
les 
eo 
5. ee. (dehiscens), when the external rind 
bursts. Properly speaking this is not peculiar to 
the Drupa, but it is the case with many species, 
as in walnut, Juglans regia; mutmeg, Myristica 
moschata, fig. 204, 206, 209, 211. 
6. One, 
