Willis. — Plant Invasions of New Zealand . 4 8 i 
breadth of 1 mile, and Norfolk is only 5 miles long and a little broader, 
while the largest of the Kermadecs has an area of 12 sq. miles, and in all 
three cases the soil is purely volcanic. It would not, I think, be difficult to 
pick out of New Zealand, even in the centre, which is the richest area, 
a small area of uniform soil which would not contain more species than one 
of these islands. As a test, it is difficult to find an area of this size that has 
been sufficiently well botanized, but in the Flora of Cambridgeshire by 
Babington, I find that of 388 genera with 950 species in the county, only 
230 genera with 388 species occur in the Wisbech district, which is about 
15 miles by 10 with fairly uniform soil and conditions, though even there 
a number of coast ( halophytic ) species enter in one part. 1 do not, therefore, 
feel surprised that these little islands do not contain more of the northern 
and western invasions of New Zealand. It is worthy of a passing note that 
Lord Howe contains 160 species (52 locally endemic) and Norfolk 162 
(43 locally endemic), and that these islands are of approximately the same 
area. 
After these preliminary remarks, we may go on to the usual method of 
prediction and verification, and endeavour to see what can be made of the 
floras of these islands in this manner. For convenience in making pre- 
dictions, we give below the complete list of the genera of these islands, with 
the islands (K, N, or H) upon which they occur. The list is compiled from 
the Floras of Howe by Hemsley (8) and Oliver ( 5 ), Norfolk by Maiden (4), 
and the Kermadecs by Cheeseman (2). 
Table III. 
Flora of Lord Howe, Norfolk, and the KerMadec Islands. 
Families and genera given in italics are found in New Zealand. 
Genera in capitals are endemic. 
No. of spp. 
Occur in 
No. 
of spp. 
Occur in 
i. Ranunculaceae 
8. Pittosporaceae 
1. Clematis 
i 
NH 
14. Pittosporunl 
3 
KNH 
2. Ranuttculus 
1 
N 
9. Frankeniaceae 
2. Magnoliaceae 
15. Frankenia 
1 
N 
3. Driniys 
1 
II 
10. Malvaceae 
3. Menispermaceae 
16. Malvastrum 
1 
N 
4. Stephania 
1 
H 
17. Abutilon 
1 
N 
4. Cruciferae 
18. Hibiscus 
3 
NH 
5. Nasturtium 
1 
N 
19. Lagunaria 
1 
NH 
6 . Cardamine 
1 
IC 
1 1 . Sterculiaceae 
7. Cakile 
1 
N 
20. Ungeria 
1 
N 
8. Lepidium 
1 
H 
12. Linaceae 
5. Capparidaceae 
21. Linum 
1 
N 
9. Capparis 
1 
N 
13. Geraniaceae 
6. Violaceae 
22. Geranium 
2 
KN 
10. Viola 
i 
N 
23. Pelargonium 
1 
NH 
1 r . Melicytus 
1 
KN 
24. Oxalis 
1 
KH 
12. Hymenanthera 
2 
NH 
14. Rutaceae 
7. Bixineae 
25. Melicope 
2 
KH 
13. Xylosma 
1 
H 
26. Evodia 
2 
NH 
K k 
