48 



The diagnostic circumscriptions of the other described Nettles of 

 this part of the globe (U. ferox, U. australis, U. Aucklandica) need 

 also a renewed revision. U. urens and U. dioica are now widely 

 disseminated through Australia. 



In the forests of tropical East Australia occurs a probably dis- 

 tinct species of this genus. 



PIPERACE^. 



Macropiper excelsum. 



Miquel, Systema Pi^eraoear. 221 ; Piper exoelsum, Forst. Prodr. 20 ; Vahl, 

 Enum. Plant, i. 335 ; Eerner, Hort. Semperrir. 33 ; Eoem. & Schult. 

 Syst. Veg. i. 313; All. Cunn. in Annal. of Nat. Hist, i. 210; J. Hoot. 

 Fl. Nov. Zeel. i. 327. 



In woods of Chatham-Island not common. 



Mr. Travers found the plant neither in flower nor fruit ; but 

 there seems no doubt of its identity. The Ghathamians bestow like 

 the New Zealanders on it the appellation " Kawa Kawa." If, as 

 Dr. Hooker's researches tend to prove, the same species extends to 

 Norfolk-Island, it is then evident that also Macropiper psittacorum 

 (Miq. Syst. Piper. 221 ; Piper psittacorum, Endl. Prodr. Flor. Insul. 

 Norfolk, 37) are referable to M. excelsum. 



THYMEL^iE. 



PiMELEA ABENABIA. 



All. Cunningham in Botan. Magaz. 3270 ; Annals of Natur. Histor. i. 377 ; J. 

 Hook. Flor. Nov. Zeel. i. 221 ; Meisner in Cand. Prodrom. xiv. 517 ; P. 

 sericese var. Wikstroem in Actis Aeadem. Scient. Holmens. 1818, 282; 

 Passerina Tsillosa, Thunberg, Mus. Nat. Acad.- TJpsalienB. xiii. 106 ; Gym- 

 nococca arenaria, C. A. Meyer, Index Sem. Hort. Petropol. 1845 ; Bulletin 

 Acad. St. Petersb. iv. 171 ; Annal. des Scienc. Natnrell. trois. s^rie, v. 373 ; 

 Endl. Gen. Plant. Suppl. iv. p. ii. 60 ; Walpers, Annal. Botan. System, 

 i. 586. 



On rocky places of Chatham-Island, where it was also found by 

 Dr. Dieffenbach. 



The capitula contain not unfrequently from 14-17 flowers. 



Our collections afford not sufficient material for drawing anew 

 the real specific limit of the plant, of which the silver-silky P. are- 

 naria appears to represent merely a certain state. Had the oppor- 

 tunity been afforded by our collection of examining the fruits of all 

 hitherto described New Zealand species of this genus, and had their 

 carpological characters proved identical, all the following plants 



