490 
Willis. — Plant Invasions of New Zealand. 
Table IX. 
Reaching Kerm., Norf., Howe 22 fams. 50 gen. 69 spp. 
Norf., Howe 
!3 
H 
] 7 
• 18 
22 ) 
Kerm., Howe 
1 
1 
1 i 
Howe 
10 ' 
10 
10) 
Norf. 
2 
■13 
2 
!3 
2 
Kerm. 
1 
1 . 
1 J 
Thus much the best representation is among the families that reach all three 
groups of islands, the second best among those reaching two. 
(19) Turning now to more general predictions, one will expect that the 
largest families in the islands will be those reaching three groups, then those 
reaching two, and lastly those reaching one only. 
Reaching 
No. of fams. 
j 
Table X. 
2 3 
Containing 
4 more genera 
Three groups 
27 
3 
8 
5 
2 5, 6 > 6, 7 , 8, 9, 9, 15, 18 
Two groups 
34 
*3 
5 
4 
2 
One group 
32 
28 
4 
- 
Thus the families reaching three groups are 27 with 125 genera, or an 
average of 4*7,. those reaching two are 24 with 43 (average i*8), those 
reaching one are 32 with 36 (average i*i). 
(20) One will expect the same of the genera. In fact the 29 genera 
that reach three groups contain 73 species, or 2*5 per genus, while the 54 that 
reach only two groups contain 97 species (i-8 per genus) and the 123 that 
only reach one contain 132 species, thus completely fulfilling the prediction. 
(21) Again, one will expect the families that reach three groups of 
islands, as oldest in their various affinities, to be best represented in New 
Zealand. The 27 families that reach all three groups of islands are 
represented in New Zealand by 79 out of 115 genera that reach N^v 
Zealand, the remaining 56 families only containing 36 genera. 
(22) In the same way, the genera reaching all three groups of islands 
should be best represented in New Zealand. There are 30 of these, and 28 
of them are represented in New Zealand, while of the remaining 176 only 
87 are represented. The two genera reaching all three groups of islands 
and not reaching New Zealand are Canavalia , represented in all by 
C. obtusifolia , one of the stock plants of the drift of sea currents, and which 
one would expect in New Zealand, and Boehmeria , represented by a separate 
endemic in each of the three groups of islands. 
(23) The species in common between three groups of islands, as oldest, 
should show the largest proportion of wides, and then those occurring in 
two or one groups. 
