262 The Vegetation of the Chatham Islands. 
endemic Coxella Dieffenbachii" but, according to DORRIEN SMITH, it is also a 
true rock-plant (1910: 124). = 
5. Salt-meadow. 
There are extensive salt-meadows in Chatham Island, but unfortunately no 
account is available of their species. Some of the combinations of halophytes, 
already given, might be classed as salt-meadow and doubtless the association 
is composed of the various salt-meadow species of the florula, indeed where 
the bed of the great lagoon is subject to Benackcal dryness round patches of 
Samolus are abundant. 
6. Lagoon. 
The only species recorded for this station is Ruppia maritima. Zostera 
might well be expected. 
b. Belumi Formations. 
I Rock, 
ere are no special rock-plants. - The most frequent species are the 
following: — Cyelophorus serpens, Polypodium diversifolium, Asplenium flaccidum, 
tormium tenax, Earina autumnalıs, Linum monogynum var. chathamicum, 
Styphelia robusta, Veronica Dorrien-Smithii, hen sp. (probably undescribed) 
and ÖOlearia chathamica. 
2. Fresh-water. 
Lakes Ei asgiah streams of dark peaty water are abundant but water- 
plants are few and scarce. The sole species recorded so far are: — Potamo- 
geton Cheesemanii, Polygonum serrulatum, Ranunculus rivularis, Callitriche 
 Muelleri and Mrsiopialbiee elatinoides. 
i 3. Swamp. 
RR a is essentially a lowland formation. In the deepest water, but rarely 
" mixed, ‚grow Leptocarpus simplex and Carex appressa var. sectoides. Where 
shallower there is a scrub of Coprosma propingua (dominant), Blechnum capense, 
Arundo conspicua, Deschampsia caespitosa, Carex Darwinü var. urolepis, Phor- 
mium, Astelia nervosa (or undescribed species), Epilobium pallidiflorum and 
2. BE As the swamp becomes drier small trees or shrubs appear, 
especially, — Coriaria ruscifolia, and the endemic Pseudopanax chathamicum, _ 
Dracophyllum arboreum and Suttonia Coxü” ), Foymenanthera chathamica nd 
 Senecio Humtii also occur to some extent. Br 
2 Moor. 
Moor is eat distalen of Chatham Island, both in the el 
and on the ‚table-land. Lowland-moor has been much modified by draining, 
YA perennial kih ee the Aciphylia-formn, but the leaves are neither gi nor spinons. ie 
The Penee measures 60 .c or more and the leaves are 30-60 cm lo: 
2) A twiggy shrab 3-—4m a high, or ar, with en root or stem and narrow-obovate, 
coriaceous ke» 1 8 cm men: 
