—:128 a, THE PERICARP. 
along the latter of which a placenta bearing — 
the seeds is placed, as the Pea, the Bean, and — 
the rest of the Leguminose. (See Fig. 47.) 
The Legume dehisces along the lines of the 
sutures—sometimes both open—sometimes on- 
ly one suture. 
493. In the Cassias there are spurious trans- 
verse dissepiments ; and some of this genus, and 
a few more of the order are indehiscent. The — 
Legume is lomentaceous when there are transverse articula- 
tions or joints, as in Ornithopus; and in this case the Le 
gume is indehiscent in the line of the suture, but divides in. 
the line of the joints. 
2. Indehiscent. 
Fig. 48. 494. The Drupe. This is a fleshy fruit, con- 
taining a stone or nut, as the Peach, the Plum, 
the Apricot, &c. In it the epicarp, sarcocarp, 
and endocarp are very distinct; the sarcocarp 
being considered an enlargement of the cellular 
substance of the carpel or leaf. (See Fig. 48, 
the Drupe of the Cherry.) 
495. The Nut.—This resembles the preceding, except in 
not being fleshy. It includes the Almond, Walnut, &¢- 
which have a very thin woody pericarp. Many botanists 
consider it a Drupe. 
496. The Achenium.—A dry one-seeded pericarp, which 
does not adhere to the integument of the seed, as in the 
_ Thistle and other Composite. It is surmounted by the pap- 
pus or seed-down, as is seen in the seed of Dandelion, with 
_ which every one is so familiar. 
497. The Caryopsis.—This is a dry one-seeded pericarp, 
adhering closely to the integument of the seed, as in Rice, 
Oats, Wheat, and all the Graminex.. In general it is im- 
possible to distinguish the pericarp from the seed in the — 
