l72 XXVII. ZYGOPHYLLE^. [Trihulus. 



muricate. Seeds 2 to 4 in each coccus, horizontal and separated by transverse 

 partitions.— Eeichb. Ic. Fl. Germ. v. t. 161 ; F. v. M. PI. Vict. i. 99 ; T. 

 lanuginosus, Linn.; DC. Prod. i. 704 ; Wight, Ic. t. 98 ; T. acanthococcics, F. 

 V. M. in Trans. Phil. Sec. Vict. i. 9. 



Ilab.. Common in many parts of the colony both north and south. 



The species is a common weed in S. Europe, temperate Africa, and S. Asia. — Bentli. 



2. T. cistoides (flowers like the Eock Eose), LAnn.; DC. Prod. i. 703 ; Benth. 

 Fl. Austr. i. 288. A perennial, forming at length a thick rootstook. Branches 

 procumbent or ascending, attaining 1 to 2ft. Indumentum more silky than in T. 

 terrestris. Larger leaf of each pair with frequently 7 or 8 pairs of leaflets. 

 Flowers large, on longer peduncles than in T. terrestris ; the sepals 8 or 4 lines 

 long, very acute, silky-hairy ; the petals obovate, at least fin. long. Anthers 

 usually (perhaps not always) oblong or linear. Fruit like that of T. terrestris or 

 rather larger, with 2 or very rarely 4 prickles to each coccus. — A. Gray, 111. Gen. 

 N. Am. t. 145. 



Hab.: Gulf of Carpentaria, Northumberland Island, R. Brown; Port Curtis, Port MoUe, 

 M'Oillivray ; Lord Howick's ^roup, F. v. Mueller ; Port Denison, Fitzalan. 



The species is frequent in the West Indies and many parts of tropical America, and in the 

 Pacific Islands, rare in tropical Asia and Africa. — Benth. 



3. T. occidentalis (Western. First found in Western Australia), R. Br., 

 in Ajjp. Sturt Exped. A diffuse or prostrate plant, the branches densely 

 tomentose-hirsute or woolly. The upper leaves opposite, the larger one of each 

 pair with 8 or 9 pairs of leaflets, silky-hairy, the base oblique, the apex pointed, 

 about 5 lines long and 2 lines wide. Pedicels slender, 1-^ to If in. long. Sepals 

 narrow, 6 lines long. Petals of a deep-yellow, exceeding an inch in length, 

 cuneate, 6 lines broad at the upper end. Stamens 10, long as the sepals ; anthers 

 all perfect, oblong ; ovary covered with long barbellate bristles ; style glabrous, 

 together with the ovary equalling in length that of the stamens. Cocci usually 

 but 2 coming to maturity, each of which are about 7 lines long and 5 lines broad, 

 and clothed by a dense covering of soft white silky hairs, and numerous long 

 hairy-subulate spines, thus the extreme diameter of fruit, including spine, will 

 often measure over l^in. The fruit examined not fully ripe. 



Hab.: Diamantina, Dr. Thos. L. Bancroft. 



The first specimens of this plant. Dr. Kobt. Brown tells us, were gathered on the west coast of 

 Australia, or on some of its islands, by the naturalists of the " Beagle." App. I.e. Mr. Bentham, 

 Fl. Austr. i. 289, says: "In J. MoDouall Stuart's collection is a fragmentary specimen from 

 Fink Elver, with a much larger flower, which may possibly be a variety of T. hystrix, but is 

 indeterminable without fruit." Both these notices agree with the Diamantina plant, and 

 differ, in my opinion, sufficiently from T. hystrix to bear Dr. Brown's name as above. 



4. T. hystrix (fruitlets porcupine-like), R. Br. in App. Sturt Exped. 6 ; 

 Benth. Fl. Austr. i. 289. A diffuse or prostrate perennial or undershrub, the 

 branches densely tomentose-hirsute or woolly. Lower leaves (at least in some 

 specimens) alternate, upper ones opposite, the larger one of each pair with 6 to 8 

 or even more pairs of leaflets, rather broad and softly silky-hairy. Flowers 

 smaller than in T. cistoides, but much larger than in T. terrestris, the petals 

 generally about ^in. long. Ovary very hirsute, with 3 or 4 ovules in each cell. 

 Cocci very villous, covered all over with hairy prickles, either subulate from the 

 base or more or less thickened and conical. 



Hab.: Towards the Gull of Carpentaria. 



5. T. pentandrus (five stamens), Benth. Fl. Austr. i. 290. A slender, 

 branching, prostrate annual, often attaining 1ft. in length, more or less hairy. 

 Leaves all alternate, with 2 pairs of oblong-lanceolate leaflets, the terminal ones 

 4 to 8 hnes long, the lower pair much smaller, usually not half the size. Flowers 



