The tropical plant agrees with that of the Shaw River. 

 The scapes are 4-8ft. in height. 



PANDANACE^. 



18. Pandanua odoratissimus L. 



Stems erect, usually several together, attaining a height of 

 30ft., bi-tri-furcated near the summit ; fruits globular, 

 6-9ui. long and in diameter, red when ripe. Reputedly 

 an indication of fresh water. " Pandanus " or " Screw- 

 pine." 



19. P. aquaticus F. v. M. 



Fitzroy, Isdell, Charnley, Denham, and King Rivers (W.V.F.). 



Stem erect, 12-25ft. ; slender, emitting adventitious roots 

 as in P. odoratissimus L., and inflorescence similar to 

 those of that species ; drupes free, obovate to cuneate, 

 dry and brown, mostly about lin. long ; when old, splitting 

 at the base into numerous fibres, the whole fruit forming 

 a globose-ovate bead, 4— 6in. long. 



HELIOSIS (FLUVIALES). 



POTAMOGETONACE^. 



20. Potamogeton javanicus Hassk. 



IsdeU, Charnley, Calder, and Hann Rivers, MacNamara Creek 



(W.V.F.). 

 Leaves floating in still water. 



NAJADACE^. 



21. Naias tenuifolia R. Br. 



Lennard, Isdell, Charnley, and Calder Rivers (W.V.F.). 

 In water and muddy localities. 



APONOGETONACE^. 



22. Aponogeton elongatus F. v. M. 



Isdell and Charnley Rivers ; bases of Artesian, Synnott, 

 Isdell and Edkins Ranges, and of Mt. Rason (W.V.F.). 



In still water. The submerged leaves are linear-lanceolate, 

 those floating, ovate-lanceolate and purplish beneath ; 

 flowers yellow, in a thick ovate spathe. 



SCHEUCHZERIACE^ (JUNCAGINACE^). 



23. Triglochin pterocarpa W.V.F. n. sp. 



Roots tuberous ; leaves numerous, form a thickened base ; 

 terete or semi-terete throughout, flaccid, the upper portion 

 floating ; scapes terete almost as long as the leaves and 

 bearing a spike-like raceme ; flowers numerous, on very 

 short pedicels ; perianth-segments, 4-6, ovate or almost 



