136 
FLOBA OF ADEN. 
outside, Ovary sessile, hirsute, 5-1 2-1 obed, 5-12-celled ; ovules 1-5 in 
each cell, superposed | style short, pyramidal or filiform ; stigmas 5-12. 
Fruit 5-angled, of 5-12 winged or spinous or tuberculate indehiscent 
cocci. Seeds obliquely pendulous ; testa membranous; embryo exal- 
buminou.s ; cotyledons oval ; radicle short. 
Species about 20. 
Distribution : — Warmer regions of the globe. 
1. Tribulus terrestris L. Sp. PI. (1753) p. 387 ; DC. Prodr. I, 703 > 
Boiss ; FI. Or. I, 902; Oliv. FI. trop. Afr. I, 283 ; Hook. FI. Brit. Ind. 
I, 423 ; Franck. Sert. Somal. in Miss. Bevoil 22. 
Tribulus albus Poir. ; DC. I, 703. 
Tribulus humifusus Schum. et Thonn. Guin. PL, p. 215. 
Tribulus Kotschyanus Boiss. Diag. PI. Or. ser II, I, 111. 
Tribulus mollis Ehrenbg. in Schweinf. FI. Aethiop. p. 29. 
Tribulus excrucians Wawr. et Peyr. Sert. Beng. p. 17. 
Tribulus lanuginosus L. Sp. PI. (1753) p. 387. 
Description : — A spreading, prostrate or decumbent annual, occa- 
sionally more or less frutescent below and persisting 2 or more years ;. 
stems and branches pilose ; young parts silky- villous. Leaves opposite, 
abruptly pinnate ; stipules lanceolate, hairy ; leaflets 3 — 6 pairs, oblong, 
mucronate, sericeo-villous, base rounded oblique. 
Flowers pseudo-axiliary or leaf-opposed, solitary. Sepals ^ inch 
long, lanceolate, acute, hairy. Petals § inch long, oblong-obovate ; claw 
short, hairy. Ovary bristly ; style short, stout. 
Fruit globose, consisting of 5 hairy or nearly glabrous, often 
muricate woody cocci, each with 2 pairs of hard, sharp spines. Seeds 
several in each coccus, with transverse partitions between them. 
Locality : — Aden (Birdw.) . 
Distribution : — Tropics of the Old World, Southern Europe, Australia, 
Sind. 
2. Zygopliyllum L, 
Frutescent herbs or shrubs, erect or prostrate, often spinose. Leaves 
opposite, 1 — 2-foliate, often fleshy. Stipules 2, often spiny. 
Sepals 5 or 4, imbricate. Petals as many, unguiculate, imbricate 
and contorted. Disk fleshy, angular, cup-shaped or concave. Stamens 
HF8, inserted at the base of the disk, longer than the petals ; filaments 
filiform, with a scale at the base within ; anthers oblong. Ovary sessile, 
4'5-gonous, 4-5-ceLed, attenuated into an angled style; stigma minute. 
Ovules 2 to many in each cell, superposed. 
