Willis.- 
-Plant Invasions of New 
Zealand . 
Table 
IV. 
Species . 
Genera . 
Families. 
Occur in N.Z. 
93 
of 
75 
and 41 
(none) 
23 
same 
(none) 
17 
15 (others) 
(none) 
(none) 
11 (others) 
Total occurring in N.Z. 
93 sp. 
1 15 gen. 
67 fams. 
Not found in N.Z. 
209 do. 
91 do. 
16 do. 
Total for all the islands 
302 
206 
83 
Thus nearly one-third of the species, more than half of the genera, and four- 
fifths of the families occur in New Zealand. 
(2) One will expect the 23 genera of the same families to be chiefly 
represented by endemic forms, or by Australian or Polynesian wides which 
have been too late to reach New Zealand. In actual fact the 23 genera are 
represented in the islands by 31 species, of which 21 are endemic to the 
islands, 1 ( Imperata Cheesemani) to the Kermadecs, 8 to Norfolk, 11 to 
Howe, and 1 ( Mariscus hatmatodes ) to both Norfolk and Howe. A further 
7 species are Australian wides, 2 are Polynesian wides, and 1 (Nasturtium 
sylvestre) is probably introduced. The prophecy is thus fully borne out. 
(3) One will also expect the 17 New Zealand genera, belonging to the 
15 families which are not represented in New Zealand by any species that 
occur on these islands, to be similarly made up of endemic species and 
Australian and Polynesian wides. In actual fact these 17 genera show on 
the islands 2 6 species, which are composed of 18 endemics, 7 Australian 
wides, and 1 Polynesian wide* 
(4) The 11 New Zealand families, which are not represented on the 
islands either by genera or by species that occur in New Zealand, are 
Saxifragaceae, Goodeniaceae, Apocynaceae, Gentianaceae, Boraginaceae, 
Gesneriaceae, Labiatae, Amarantaceae, Lauraceae, Iridaceae, and Amaryl- 
lidaceae, and are represented on the islands, as one would rather expect, by 
11 endemic species, including two endemic genera ( Colmeiroa and Negrid) 
and 10 Australian wides. One of the endemic species, Moraea Robinsonian a , 
belongs to an African genus, which probably arrived by sea carriage. 
(5) Passing on now to the species, genera, and families given in Table IV 
as not found in New Zealand, one will expect that a large proportion of the 
species will be endemic in the islands. In fact, of the 209 species that occur 
on the islands and have hot been found in New Zealand, no less than 105 
appear to be endemic to the islands. 
(6) One will expect that the remaining 104 species will be Australian 
or Polynesian wides, especially the former. In fact 93 of them are 
Australian and 9 Polynesian, while 2 (Nasturtium sylvestre and Cakile 
maritima ) are perhaps introduced, being European types. 
