OF SOUTH AUSTRALIA. 
65 
To make a correct determination of any given plant requires great care 
and the possession of full-grown fruiting specimens. The main differences 
are in the leaves and receptacles. 1 give Agardh’s schemes of diagnosis 
(with slight modification) which are based on these characters separately. 
LEAVES. 
a. Lower leaves flat, more membranaceous; 
almost entire (without teeth on the 
margins) . 
b. Elongate linear S. fallax . 
bb. Shorter lanceolate 8. laevigatum. 
aa. Lower leaves flat coriaceous ; almost entire. 
c. More obovate S. globidariaefolium, 
S. robustum. 
cc. More lanceolate 
S. vest Hum. 
aaa. Lower leaves flat, coriaceous, dentate or 
crenulate. 
d. Nearly entire 8. b v act eo to sum. 
dd. All serrate 8. tnstichum, 
S. ensifolium, 
S. Amaliae. 
ddd. Lower entire, upper serrate 8. Gunnianum , 
S. erosum. 
aaaa. Lower leaves very large (3 to 6 inches), 
crowded at the base, oblong-lanceolate.* 
e. Entire 
ee. Sharply toothed 
eee. Deeply serrated 
eeee. More or less undulate 
S. membranaceum. 
8. grande. 
S. lacerifolium. 
8. biforme . 
S. paradoxum. 
8. undulatum. 
RECEPTACLES. 
a. Leaves acting as bracts to the receptacles 
often conspicuously differing from the 
others. 
b. Receptacles terete, unarmed with teeth. S. robustum , 
8. bracteolosum , 
S. laevigatum ,, 
8. fallax , 
8. paradoxum. 
*The lower leaves' of S. rhynchophorum have not been observed. 
C 
