xxxi. ZYGOPHYLLE^:. (Edgeworth & Hooker.) 423 



DISTRTB. Genera, about 17, with 100 species, chiefly tropical and sub- 

 tropical. 



* Seeds exalbuminous. 



Petals entire. Stamens 10. Fruit of usually spiny cocci. Leaves 



abruptly pinnate 1. TRIBULUS. 



** Seeds albuminous. 



Petals 0. Stamens 5. Leaves 3-foliolate 2. SEETZENIA. 



Petals 4-5. Stamens 8-10. Ovules axile, superposed. Leaves 



1-2-foliolate 3. ZYGOPHYLLUM. 



Petals 5. Stamens 10. Ovules basal, collateral. Leaves 1-3- 



foliolate 4. FAGONIA. 



(See PEGANUM in Rutacece.) 



1. TRIBULUS, Linn. 



Branching prostrate herbs, usually silky. Leaves stipulate, opposite, usually 

 unequal, abruptly pinnate. Flowers solitary, on pseudo-axillary peduncles, 

 white or yellow. Sepals 5, deciduous (or persistent) imbricate. Petals 5, 

 fugacious, patent, imbricate. Disk annular, 10-lobed ; stamens 10, inserted 

 on the base of the disk, 5 longer opposite to the petals, 5 shorter with a 

 little gland outside ; filaments filiform, naked. Ovary sessile, hirsute, 

 5-12-lobed, 5-12-celled, cells opposite the petals ; style short, pyramidal or 

 filiform, stigmas 5-12; ovules superposed. Fruit 5-angled, of 5-12 winged 

 or spinous or tuberculate indehiscent cocci. Seeds obliquely pendulous, 

 testa membranous ; embryo without albumen, cotyledons ovate, radicle 

 short. DISTJRIB. A cosmopolitan genus of about 15 species. 



1. T. cistoides, Linn. ; DC. Prodr. i. 703 ; perennial, flowers 1-2 in. 

 diam., peduncles equalling or exceeding the leaves, cocci 2-4-horned. 



BENGAL, near Calcutta, Edgeworth ; WESTERN PENINSULA, Madras, Shuter, &c. ; 

 Kilghiri Mts., Foulkes ; Tenasserim at Mergui, Wallich. DISTRIB. Throughout the 

 Tropics. 



Bootstock stout ; branches 1-2 ft., procumbent or ascending, and leaves usually more 

 silky than in the following. Leaflets often 7-8 pairs, subequal ; stipules falcate, acumi- 

 nate. Sepals k~B in-, acuminate, silky. Petals obovate. Stigmatic lobes shorter than 

 the diameter of the style. Cocci tubercled and hairy, with usually 2 spines. Seeds 

 separated by transverse septa Regarded as a large flowered form of T. terrestris by 

 Oliver (Fl. Trop. Afr. i. 284). 



2. T. terrestris, Linn. ; DC. Prodr. i. 703; annual or biennial, flowers 

 |-f in. diam., peduncles shorter than tile leaves, cocci with 2 long and '2 

 short spines. Dalz. & Gibs. Fl. Bomb. 45. T. lanuginosus, Linn. ; DC. I.e. ; 

 W.&A. Prodr. 145 ; Wall. Cat. 6854 ; Wight Ic. t. 98 ; III. i. 164 ; Boiss. Fl. 

 Orient. i. 902.fiurm. Fl. Zeyl. 265, t. 106, f. 1. 



Throughout INDIA, ascending to 11,000 ft. in WESTERN TIBET; northern part of 

 CEYLON. DISTRIB. Throughout the warm regions of the globe. 



Prostrate, hirsute or silky hairy ; branches 1-2 ft. Leaflets 5-7 pairs, subequal, mu- 

 cronate. Petals often not exceeding the calyx. Cocci very variable, glabrous or hairy, 

 mucronate, much as in T. cistoides. Astigmatic lobes longer than the diameter of the 

 style. 



3. T. alatus, Delile ; DC. Prodr. i. 703; annual, flowers |- in. diam., 

 peduncles shorter than the leaves, cocci broadly winged. Boiss. Fl. Orient. 

 i. 902. 



