Kirx.—On the Lake District of the North Island. 341 
Zoysia pungens, Willd.—Taupo plains, and about all the lakes. 
Bromus arenarius, Lab.—Rotorua. 
Poa australis, Br., var. levis.—In all the low vallies from Te Ngae south- 
wards, but nowhere found on the hills above 1,600 feet. 
Zoysia pungens and Poa levis are the only forms found over extensive 
areas ; the propriety of considering the latter to be a littoral plant may 
possibly be questioned by those who are familiar with its distribution in the 
South Island only. In the North Island it occurs almost exclusively by the 
sea, or by tidal rivers, as at Port Waikato, except when under similar circum- 
stances to those now under consideration, as at Cambridge in the Middle 
Waikato, from which locality it has been carried by the river toa recently 
formed island at Rangiriri, as I learn from a specimen given me by Captain 
F. W. Hutton. Mr. Buchanan informs me that in several instances in the 
South Island it distinctly marks the margins of ancient sea basins. 
The examination of the southern and western parts of the district is 
necessary to the full consideration of this interesting subject. 
It is worthy of remark that Rotokakahi and the Tikitapu Lake are the 
only lakes at which littoral plants were not collected. These are situate at an 
elevation of about 1,400 feet, or 300 feet higher than Lake Tarawera, and 
nearly 200 feet above Lake Taupo. This points to the greater age of the 
first-named lakes, and accounts for the absence of maritime plants on their 
shores. 
The contrast between the arboreal vegetation of Rotokakahi and Roto- 
tarawera is most striking, and from the short distance that separates the two 
lakes is at once realized by the traveller. The most prominent trees on the 
banks of the former are terrestrial specimens of Metrosideros robusta, marked 
by small, compact, uniform, green-tinted foliage; on the latter, M. tomentosa, 
with spreading tortuous arms, and ‘bold, grey, many-tinted foliage, changing 
with every breath of wind,—the one a plant specially characteristic of inland 
forests, the other equally characteristic of the northern cliffs and sea beaches. 
SuMMARY. 
For convenience of reference, I have prepared the following brief summary 
of the additions to our phyto-geographical knowledge comprised in this 
paper :— 
Clematis colensoi, Hook. f—Sparingly in earthquake fissures in the Wai- 
horepa valley, the most northern locality known to me. 
Montia fontana, L.—Attains its northern limit at Kaitiriria ; altitude 1,500 
feet. 
Elatine americana, Arnott.—Exhibits an extension of its known range east- 
ward at Maketu, and southward at Rotorua. 
