May 9, 1950. 
THE SOUTH AUSTRALIAN NATURALIST 
Page Fifteen 
Acacia obliq.ua 
Acacia myrtif olia 
Acacia li^ulata 
Acacia notabilis 
Acacia Victoriae 
stipules 
Acacia Victoriae 
juvenile leaves. Later these fall off, and the 
petiole (leaf stalk) flattens and broadens 
into a phyllode which looks like, and acts 
just the same as, a true leaf. The inter- 
mediate stage, a phyllode half-grown, with a 
spray of bipinnate leaves at its outer end, 
is often seen on the Blackwood. 
All the phyllodinous Acacias are indigenous 
(occur only in) to Australia. 
According to Black there are in all some 
500 species of Acacia, of which about 300 
are indigenous to Australia. According to 
Ewart, the genus numbers 780, of which 410 
are native to Australia, the rest being dis- 
tributed among Africa (130), Arabia, South 
America, and one or two other countries. 
Black lists 80 Acacias for South Australia, 
of which number the Adelaide Hills area 
has 17. 
The Adelaide Hills area, for the purposes 
of this discussion, and the included key, 
means the Mount Lofty Range, from Gawler 
and Truro in the north to Cape Jervis and 
Victor Harbour in the south, and from the 
Adelaide foot-hills to the eastern edge of 
the range as marked by, say, Strathalbyn, Mt. 
Barker trig, Palmer and Keyneton. Such 
a definition is, of course, extremely arbitrary, 
but may serve in some measure to indicate 
that the HILLS in contrast to the adjacent 
PLAINS, constitute the area under con- 
sideration. 
The key given below is basically that used 
in Black's Flora of South Australia. An 
