Ecological Notes on the Vegetation of 80-Mile Beach. 103 
n. Spinifex piiidan sliowiiig the assoeiatiou of slmibs and 
tussock grasses. Acacia liolosericea, A. tiunida <ind FU'ctmclmc 
Scliinsii. 
Both phases of the ])indau carry various species of Acacia. These, ex- 
ce]>t in the case ot Acacia i ranslnccn^^ which grows about two to three feet 
high, an^ all small ti'(‘es. They commonly rmiu thickets in which only one 
species is rejn'esented. The commoner species ai'(^ .1. hunida, A. l/(dosci'icca , 
-1. trachijcaypa, A. paclitjcarjai, A. corntcea, .1. >uipycss(j ami .!. stipnlifjeva. 
In marked contrast to the coastal }>laiu arc the number ot shrubs which 
are as^-ociated with the ])erennial tussock grasses. Thev include tlu' follow- 
ing’: Ahattlo)/, l\alcoUti, .1. nidir/iin, Sidtt Icpida. ci. sj)inosa. Cahffhri.r m- 
tcrstans^ Jlalgania Ulforalis, Piatclca annnoch.aris, .Id/v'ui/e tomr}it(}sa , Ct/ario- 
■^tcgia Bunvgana , and Npw'.((Stlia- cJadoiricha. Larger forms are Luns/u gla- 
tinosa, C. Sturtn var., Clerodendron tomentosum, Gardenia Paaioni and Da- 
hoif^ia ITopwoodii and Htglohasimn fipathnlatum. Members of the Ib'oteaccae 
are not numerically important. They include (h-erlUca pgramidalis, G. re- 
fract((, (r, agrifoUa, IlaJica ma^croearpa and /Vraormm f(dcat<(. There art‘ 
many slender shrubs belonging to tlu‘ Leguminoseae. Kucalypts ar<‘ not 
well represented. Tn most ])laces they are cum[)letely lacking fiami the 
Triodia jihase while in tin* Plecti'achne country they gradually a})pear mor(‘ 
often as one goes farther inland. They either form small mallei' (lumps or 
(kv('lop into small tri'cs from ten to tifteen feet high. The s] ;*<d<'s are 
K'UraJg ptuH zggophglla and P. dichrowopidoia. 
Plants of Pragrostis eriopoda ai'e often seen ainong-i the T) India tus- 
socks. This grass is the most important s])ccies after Triodia and PJec- 
Iracline since if replaces both when they are d(*stroyed and prcvtuli'd from 
recovering through seedling development. Xormahy Eragrasii:< eriopoda is 
]>resent in the association as a minor constitiu'iit. 
Other grasses present are Amphij)ogon strictu^, (lirgt^opogon paUida;<^ 
Cyrnhopogon bombt/cina^^, Digitaria Brownei, Digitaria ctenantha. Panicinn 
ci/mhiformCj I chnanthns aiistraliensis, Setaria s}irgensj . I ristida arenari<(, 
