ON THE STUDY OF THE SCIENCE OF BOTANY. 
213 
belong to various diadelphous genera; and also a large proportion 
of ornamental trees and useful herbs. 
The characters of this class being different from any other., I have 
given them at length. 
1. Calyx , a perianthium monophyllous, campanulate, and withering, 
the base gibbous, the lower part thereof fastened to the peduncle; the 
upper part obtuse and melliferous ; the brim quinquedent ate, acute, 
erect, obtuse, unequal; the lowest odd denticle longer than the rest; 
the upper pair shorter and farther asunder; the bottom of the cavity 
moist, with a mellious liquor, including the receptacle. 
2. Corolla, termed papillionaceous, unequal; the petals expressed 
by distinct names, viz. : 
Vexillum , the standard, a petal covering the rest, incumbent, greater, 
plane horizontal, inserted by its claw in the upper margin of the recep¬ 
tacle, approaching to a circular figure when it leaves the calyx, and 
nearly entire along it, and especially towards its extremity, runs a line 
or ridge that rises up, as if the lower part of the petal had been 
compressed; the part of the petal next to the base approaching to a 
semicylindric figure, embracing the parts that lie underneath it ; the 
disk of the petal is depressed on each side, but the sides of it nearest 
to the margin are reflexed upwards. Where the halved tube ends, and 
the halved limb begins to unfold itself, are two concave impressions, 
prominent underneath, and compressing the wings that lie under 
them. 
Alee, the wings, two equal petals, one at each side of the flower- 
place underneath the vexillum, incumbent with their margins, parallel, 
roundish, or oblong, broader upwards, the upper margin straight, the 
lower spreading into a roundness, the base of each wing bifid, the lower 
divisions stretching out into a claw inserted into the side of the recep¬ 
tacle, and about the length of the calyx, the upper shorter and 
reflexed. 
Carina, the keel, the lowest petal, often bipartite, placed under the 
vexillum and between the wings, boat-shaped, concave, compressed on 
the sides, set like a vessel afloat, mutilate at the base, the lower part of 
which runs into a claw of the length of the calyx, and inserted into the 
receptacle; but the upper and the side lacinice are interwoven with the 
part of the ala that is of the same shape ; the form of the sides of the 
carina is much like that of the ala, and so also is their situation, except 
that they are lower, and stand within them; the line that forms the 
carina in this petal runs straight as far as the middle, and then rises 
gradually in the segment of a circle; but the marginal line runs 
