34 Willis . — The Flora of Stewart Island (New Zealand): 
Table III. 
Families. 
Genera. 
Species. 
New Zealand 
9 i 
329 
L 392 
Stewart 
£4 or 59 % 
1 54 or 46 % 
31 1 or 22 % 
(2) A family will 
rarely arrive 
as a group of genera 
simultaneously ; 
some will arrive sooner 
than others. 
Therefore, on the whole, families with 
more than one genus in a given country will be older there than those with 
only one in that country, and may be expected to be better represented. 
Testing this, we get : 
Table IV. 
Family represented , „ ~ 7 , 
Represented in 
Not represented 
in A T eiv Zealand by 
Stewart by 
there. 
1 genus 
36 families 
13 families, 36% 
23 families 
2 
15 
6 40 
9 
3 
*5 
12 80 
3 
4-5 
10 
9 90 
1 
6-10 
9 
8 90 
1 
over 10 
6 
6 100 
- 
91 
54 59 % 
37 
In other words, the most ‘successful’ families in New Zealand are the 
best represented in Stewart, and the proportion of families shows a steady 
increase with the increasing number of genera contained in them. 
One may even push this into greater detail, and take the thirty-six 
families with one genus, dividing them according to the number of species 
in the genus, when one finds : 
Table V. 
Genera . 
7 
5 
24 
No. of Species contained. 
6 or more ; 50 in all 
3 > 4 ) or 5 5 1 7 
1 or 2 ; 30 
Represented in Stewart by 
14 species, or 28 % 
4 2 3 
3 10 
(3) One may extend the idea indicated in this last table, and make the 
same prediction about the genera as about the families, and say that those 
with most species in New Zealand will be the best represented in Stewart. 
Table VI. 
Genus represented in 
In A T ew Zealand. 
Represented in 
Not representea 
New Zealand by 
Stewart by 
there. 
1 species 
155 genera 
32 genera, or 20 % 
123 genera 
2 
£4 
22 
40 
32 
3 
29 
20 
68 
? 
4~5 
29 
23 
79 
6 
6-10 
36 
32 
88 
4 
11-20 
16 
15 
93 
1 
over 20 
10 
10 
100 
““ 
329 
154 
46% 
*75 
Thus, just as with the families, the proportion of genera represented in 
Stewart shows a steady increase with the increasing number of species in 
the genus, from 20 per cent, of those with one up to 100 per cent, of those 
with more than 20 species. 
