510 
PACIFIC SCIENCE, Vol. XIX, October 1965 
It seems unlikely that this species occurred 
anywhere outside of Australia until the writer 
introduced it into California in I960. Pope 
(1929:3) thought that certain trees on the 
island of Hawaii belonged to this species, and, 
because of the bitterness of their nuts, urged 
their destruction to prevent them from hybrid- 
izing with the other two species. I was closely 
associated with Pope at the time, and was famil- 
iar with the trees in question. Having seen 
both M. ternifolia and M. integrifolia in their 
native habitats and under cultivation, I am rea- 
sonably certain that the trees in question were 
not the first species but were a form of the 
latter in which some bitterness had developed. 
Bitterness is known to occur in some seedling 
lines of the species. 
M. integrifolia. 
vernacular NAMES: Macadamia nut; 
smooth-shell macadamia nut; Queensland nut; 
Australian nut; bush nut; nut oak; Bauple nut 
(sometimes spelled as pronounced, Bopple, or 
corrupted to Popple). 
INDIGENOUS RANGE: Coastal and tropical 
rainforests on the eastern slopes of the Great 
Dividing Range in Queensland, extending north- 
ward from the Numinbah Valley, which lies 
immediately to the north of the McPherson 
Range of mountains that forms the boundary 
between Queensland and New South Wales, 
to the lower Mary River near Maryborough, a 
distance of about 275 miles; latitudinal range, 
about 28°-25° S. 
The trees of this species are large and spread- 
ing, some attaining heights of 60 ft or more 
and spreads of 50 ft. The branchlets are lighter 
colored than those of M. ternifolia. New flushes 
of growth generally lack any reddish or pinkish 
coloration. Juvenile leaves are long, linear-lance- 
olate, the adult leaves usually becoming entire or 
nearly so (Fig. 3 B). Adult leaves measure 4-12 
Fig. 2. Seeds of Macadamia species. Top, M. ternifolia; left, M. integrifolia; right, M. tetraphylla. 
