i 



i 



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f 



mi 



fc 



Tribulus.] XXVI, ZYGOPHYLLEJi. 289 



1^ large, on rntlier long pedicels. Sepals very acute, 3 to 4 lines long. Petals 



more than twice as long. Anthers short, ovate. Ovary very hirsute, Avith 

 only 2 ovules in each cell. Fruit about 3 lines long, the cocci"^ slightly muri- 

 cate and often \vith 2 short prickles, containing each 1 or 2 seeds separated 



^ by a transverse partition. 



N. Australia. Dry sandy pastures on the Upper Victoria river, F. Mueller. 



4. "• hystrix, i?. Br, in App, Stnrt, Exped. 6. A diffuse or prostrate 

 perennial or undershrub, the branches densely tomentose-hirsute or woolly, 

 liower leaves (at least in some specimens) alternate, upper ones oi)posite, 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, cisloides, but much 

 larger tlian in t, ierrestris,' the petals generally about ^ in. long. Ovaiyvery 

 hirsute, with 3 or 4 ovules in each cell. Cocci vciy villous, covered all over 

 ^vith hairy prickles, either subulate from the base or more or less thickened 

 and conical. — T. occidentalis, R. Br. 1. c. (from the short diagnosis given). 



.' Australia. N.AV. coast, A. C mining h am ; on sandy soil, in the interior from 

 i>iichol Bay, F. Gregory. 



S. Australia. Towards Spencer's Gulf, Warhurton, 



^ he specimens I have seen are most of them very incomplete, and those described by R. Brown 

 unfortunately mislaid. The few fruits ou Gregoiy's specimius show, however, that the cha- 

 racter relied on by R. Brown for the distinction of T. hjstrix and T.occidetdalUy the suba- 

 late or conical prfckled of the fruit, does not hold good. In iM'Doiiall Stnart's collection is 

 ft fra^^mentaiy specimen from Fink river, wilh a much larger flower, which muy possibly be 

 a variety of the same species, but is indeterminable without the fruit. 



/ 5. T. macrocarpus, F. MnelL Herb. Foliage and flowers unknown. 



Cocci quite glabrous, nearly | in. long, tlie edgi^s bordered by narrow, verti- 

 cal, hard, slightly denticulate wings, with 2 straight, horizontal, conical 

 prickles on the buck about halfway up and a vertical prominent rib between 

 tliem, the sides smooth. 



N. Australia. lu thu interior, from Niehol Eay, F. Gregory. 



6. T. platyptems, BentJi. A shrub of 2 to 3 feet, glabrous, except 

 tlie inside of the sepals, the older branches in one specimen corky, ' Leaves 

 opposite, the larger one of each pair with about 5 or 6 pairs of obtuse leaflets. 

 Pedicels rather short. Sepals veiy acute, at least 4 lines long, bright-green 

 aud glabrous outside like the rest' of the plant, woolly-hairy inside. Petals 

 ^iTOw% about \ in. lono-. Fruit about i in. lon^ and f in. broad, i 



nai 



including 



the wings, truncate rather than cordate at the base ; the cocci glabrous or 

 very slightly haiiy, bordered by broad, vertical, semicircular, membranous 

 f ^ings, and smooth between the wings and on the sides. 



W- Australia. Hammersley range, F. Grego-y. 



7. T. hirsutus, Benth. A shrub allied to T. pMypUrm and considcreJ 

 "y F. Mueller as a varit^ty, but the brandies, leaves, and inflorescence are hir- 

 ^iite with long fine spreading hairs ; the flowers are ratlier smaller; the sepals 

 hu-sute outside, not woolly inside, but hirsute along the middle with straight 

 liiiirs; the wings of the fruit form rouiuled auricles at the base, giving the 

 ' outluie a cordate form; and the coeei are prominently reticulate, almost mu- 



P^ate, both on the back between the wings and on the sides next to the ad- 

 joinm'r cocci. 



VOL. I. 



V 



H 



