1?^ ZYaOPRYLLEM, [Teibulus. 



nerves are usually clothed with rusty tomentum ; the upper surface of 

 thej leaves is reticulate and rather shining : the flowers too are a little 

 larger, and the samaras are usually oblong. 

 Pehra Dun. Dibtrib. : Trop. Himalaya, from Nepal to Sikkim ; also in 

 E. Bengal, Assam, Chittagong, and Burma. 



XXVI.-ZYGOPHYLLEiE. 



Heebs or shrubs, rarely trees. Leaves opposite (alternate in JPega- 

 num), stipulate, 2-3-foliolate pinnate or multifid, not punctate; 

 stipules usually twin, persistent, sometimes spiny. Peduncles 

 usually 1-2 in the axils of the stipules, or solitary subterminal and 

 leaf-opposed. Flowers hermaphrodite, usually regular. Sepals 4-5. 

 Petals 4-5, usually imbricate, rarely 0. Disk convex or depressed, 

 rarely annular or 0, without glands. Stamens equal to or double 

 the number of petals, rarely more (12-16 in Peganum), inserted at 

 the base of the disk, often alternately longer. Ovary sessile or shortly 

 «talked, lobed or winged, usually 4-5-celled ; style angled or fur- 

 rowed ; ovules 2 or more in each cell. Fruit coriaceous or crustaceous, 

 either of 5-12 free or united often spiny cocci, or capsular and septi- 

 cldally dehiscent. Seeds usually pendulous and solitary (many in 

 Peganum) ; albumen scanty, mrely 0. — Chiefly tropical or subtropi- 

 «eal. 



Stamens 10. 



Leaves abruptly pinnate, fruit spinous . . 1. Tribulus, 



Leaves 1-3-foliolate, fruit not spinous . . 2. Fagonia. 



Stamens 12-15, leaves multifid .... 3. Peganum. 



1. TRIBULUS, Linn.; Fl. Brit. Ind. i, 423. 



Branching prostrate usually silky herbs. Leaves stipulate, oppo- 

 site, abruptly pinnate ; leaflets usually unequal. Flowers solitary, 

 on pseudo-axillary peduncles, white or yellow. Sepals 5, imbricate. 

 Petals 5, imbricate, spreading, fugacious. Bisk annular, 10-lobed. 

 Stamens 10, inserted on the base of the disk, alternately longer and 

 shorter, the latter with a small gland outside ; filaments filiform, 

 naked. Ovary sessile, hirsute, 5-12-lobed and-celled; style short; 

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

 or spinous or tuberculate indehiscent cocci. Seeds 2 or more in each 



