424 NATURAL HISTORY OF PLANTS. 
frutescent plant, with fluted branches, often prismatic, the leaves 
opposite, compound-pinnate, with two opposite unsymmetrical 
folioles, beyond which the rachis is often prolonged under the form of 
a small tongue, and with a petiole articulate at the base, accompanied 
by two lateral stipules. The flowers are situated in the vicinity of 
the axil of the stipules belonging to two opposite leaves, and at the 
same time almost at the bottom of the angle formed by the diver- 
gence of the axillary branches of these two leaves.’ They are either 
solitary, or more frequently geminate, one of the two being younger 
than the other, upon the side of which it is placed.’ 
In some species of this genus, distinguished under the name of 
Agrophyllum the folioles are rounded instead of being flattened, as 
in the preceding; the dehiscence of the fruit is 
septicidal, and the ovules present slight differences 
in their form.* In others again, inhabiting Aus- 
tralia, and which have been made into the genus 
Repera’ (fig. 503), the fruit is sometimes loculi- 
cidal and sometimes septicidal, and the staminal 
filaments have no interior appendage. There are, 
Zygophyllum (Rapera) 
Jabagifolium. 

moreover, other characters which may vary in the 
Fra. 503. 
Flower. 
genus Zygophyllum—viz., the number of folioles 
to each leaf, which may be reduced to one; the 
consistence of the stipules, which may become spinescent ; the 
floral type, which is sometimes quaternate ; the form of the disk, 
which is rarely cupuliform; and the number of the ovules, which 
may be reduced to two in each cell. Thus Sarcozygium consists 
of species of Zygophyllum, with winged fruits? the flowers of 
which are tetramerous, and the leaves opposite and bifoliolate, cha- 
racters quite insufficient to found a genus; and Z porlulacoides, from 
Bokhara, distinguished under the name of J//ianthus,’ has penta- 
gonal fruits not winged ; but the calyx is developed and petaloid, while 

1 The real situation of this inflorescence is 
such that it corresponds probably to the axil of 
a leaf placed lower, and has been drawn and 
raised with the internode, above which it be- 
comes free, This is an extraordinary fact in 
1 The raphe is said to be free. 
5 A. Juss., in Mém. Mus., xii. 454, t. 15, 
fig. 3.—ENDL., Gen., n. 6035. 
6 Ba&e., in Linnea, xvii. 7, t. 1.—B. H., 
Gen., 266.—H. BN., in Adansonia, x. 315, 
most species of Zygophyllum, especially in the 
various sections of the genus Guaiacum, (See 
Adansonia, x. 312, 315.) 
2 In this case the inflorescence is a two- 
flowered uniparous cyme. 
8 Neck. Llem., n. 967. 
7 As is often the case in the species of Zygo- 
phylium proper. 
8 Cuan. & Sonurt., in Walp. Ann., i. 495. 
9 Enum. Pl. Lehm., 58, t. 9 (ex Arbt. d. 
Nat. Ver, Riga, i. 197).—B.} H., Gen., 266, n. 
7.—H. By,, in Adansonia, x. 313. 
