10 Dansk Botanisk Arkiv, Bd. 2. Nr. 8. 



An analogous formation occurred at Point Samson just 

 above the mangrove. The plants recorded from this locality were 

 Arthrocnemum leiostachyiim, Frankenia ambita and Trianthema 

 tur gidif otium. 



I add a list of plants from a salt-pan formation at Carnar- 

 von, south of the Capricorn, as its composition and appearance 

 were very like what is said above. The lower zone consisted of 

 a glaucous, long-branched Salicornia australis and the aphyllous 

 Limonium (Statice) salicorniaceum ; at the higher level, three dark- 

 green Arthrocnemum-imdershmbs (A. arbuscula, A. brachystachyum 

 Pauls, and A. pruinosum Pauls.) were predominant; Salicornia had 

 thrown off its ripe fruits, while the Arthrocnemum' 's were with 

 flowers and fruits. Other plants were the aphyllous Samolus junceus, 

 Frankenia pauciflora, a grass and some small Chenopodiaceæ. 



The enumerations given are all characterized by the succu- 

 lent perennial herbs, many of which are aphyllous, and copious 

 hairiness does not occur in any species. 



To this formation rather than to the sand-dune formation I 

 reckon two real shrubs, viz. the glaucous Nitraria Schoben, which 

 I saw at Carnarvon, and the bright-green Myoporum acuminatum 

 (var. angustifolium) which grew both at Carnarvon and at Point 

 Samson! 



4. The Sand-Dune Formation. 



The dunes nearest to the sea were covered by the large grass 

 Spinifex longifolius, which was seen at all the places visited (ex- 

 cept Derby, where I had no opportunity of seing sand-dunes). 

 The big globular spiny inflorescences loosen at maturity from the 

 straw, and are rolled by the wind over the bare sand; in shel- 

 tered places one finds them blown together in quantities. No 

 doubt the wind acts as chief agent in the dispersal of this species. 



At some little distance from the sea the dune plants become 

 much more numerous. Amongst the different species of grasses 

 I may mention Triodia pungens and others. Several annuals 

 were also seen, but as the season was very unfavourable for these 

 ephemeral plants, I am not able to give any information as to 

 them. An interesting feature of the dune-formation is that the 

 shrubs play a great role in its composition. At Point Samson 

 the silver-felted Scævola sericophylla with small whitish flowers 

 was common; at Port Hed land the characterising species was 

 a low Wattle (Acacia Wickhamii), and at Broome other Wattles 

 (Acacia holosericea and A. binervosa). 



