ZYGOrHYLLEiE. 
185 
ORDER L. ZYGOPHYLLEvE. 
Calycine sepals 5. Petals 5, alternate with the 
sepals, inserted on the receptacle. Stamens 10, distinct, 
hypogynous ; 5 of them opposite to the sepals, and 5 
to the petals. Ovary single, 5-celled: styles 5, united 
into 1, sometimes subdistinct at the apex. Capsule 
of 5 carpels, united among themselves and to a central 
axis, with the cells opening at the upper angle : seeds 
1 — co ; embryo straight ; radicle superior ; cotyledons 
leafy. 
Herbaceous or shrubby ; leaves stipulated at the base, fre- 
quently compound. Plants belonging to this order are more 
or less bitter, with a slight degree of acridity. 
Tribulus. Caltrops. 
Calyx of 5 deciduous sepals. Petals 5, patent. 
Stamens 10. Style O. Carpels 5, fixed on an axis, 
triangular, indehiscent, hard, gibbous, spiny, trans- 
versely many- rarely one-cel led. Seeds solitary in 
each cell. 
Diffuse herbaceous plants. Flowers in general yellow. The 
generic designation is derived from rgstg three and (3oXog a point, 
in reference to the points of the carpels. The English name 
Caltrops is given to it, from the resemblance the fruit has to 
the machines which were formerly cast in the way to obstruct 
an enemy’s cavalry. 
1. Tribulus Cistoides. Cistus-like Turkey -Blossom. 
Leaves 8-jugate, leaflets subequal silky beneath, 
peduncles length of the petiole. 
Jacq. Schoenbr. 103. — Pink. t. 07. f. 4. 
HAJ3- Common in the Plain of Liguanea. 
FL. After rains, during the warmer months. 
Root perennial, woody. Stems several, 1-2 feet long, 
herbaceous, procumbent, round, hairy (a minute curled pubes- 
cence intermixed with the long hairs), reddish, jointed, sending 
off short horizontal branches. Leaves opposite, the one com- 
posed of 3-4 and the other of 0-8 pairs of leaflets ; leaflets, 
shortly petiolulated, lineari-oblong, apiculate, delicately veined, 
glabrous above except along the mid-rib, serieeo-villous be- 
