RUTACEX. 427 
found in the Mediterranean region, the East, tropical Asia, and as 
far as Mexico.' 
The flowers of Zribulus (Fr., Herses*) (figs. 511-513) are also 
hermaphrodite, regular, pentamerous, with imbricated or contorted 
sepals. 
Of the six stamens,’ inserted round the base of the hypo- 
gynous disk with ten lobes, five are longer, alternipetalous, and 
Tribulus terrestris. 

Fie. 511. 
Flower (3). 
Fra. 512. 
Long. sect. of flower (5). 
more exterior, with a filament provided outwardly with a basilar 
All have a two-celled, 
longitudinal clefts.* The superior 
gland. 
cells. 
introrse anther, dehiscing by two 
gynæceum is formed 
of a sessile ovary, which in 7? ferrestris, and other 
analogous species, has five oppositipetalous cells, and 
is surrounded by a short, thickset style, divided into 
five vertical stigmatiferous lobes, alternating with the 
In each of them are several descending and 
anatropous ovules, inserted in the internal angle, 
with superior and exterior micropyle.’ 
Tribulus terrestris. 

Fie. 513. 
Fruit (3). 
In certain 
other species of this genus, there is a greater number 
of ovary cells, containing either numerous descending 
sometimes only one. 
ovules, or 

L'REICHB.,, Jc, Hl. Germ., v. t. 158. — 
SIBTH., F1. Grec., t. 455.—Borss., Fl. Or., i. 
917.—Watr., Rep., i. 517; ii. 824; Ann., iv. 
414; vii. 509. 
2 Tribulus T., Inst., 265, t. 141.—L., Gen., 
n. 532.—Apans., Fam. des PL, ii, 507.—J., 
Gen., 293.—Gmrtn,, Fruct., i. 335, t. 69.— 
Lamr., Zll., t. 346.—Porr., Dict., viii. 43; 
Suppl, v. 338.—DC., Prodr., i. 703 (part.).— 
A. Juss., in Mém. Mus., xii. 451, t. 14, fig. 1.— 
Turp., in Dict. Se. Nat. Atl., t. 123—ENDL., 
Gen., n. 6030.—PayEr, Organog., 60, t. 14.— 
A. Gray, Gen. IIL., t. 145.—B. H., Gen., 264, 
n. 1—H. By., in Adansonia, x. 313 (incl.: 
Ehrenbergia Maxr., Heterozygia Ben., Kall- 
stremia Scop., Tribulopsis R. BR.). 
3 Five are often sterile, or wanting in Zri- 
bulopsis (R. Br., in Sturt Exp. App., 70). 
1 The pollen is, according to H, Monn (in 
Ann. Se. Nat., sér. 2, iii. 339), “ spherical, 
membrane externally cellular (7. alatus, T. 
terrestris, T. lunuginosus, Ehrenbergia tribu- 
loides).” 
5 With donble coat. Generally disposed in 
one single vertical series at maturity. 
