Rhopalostylis sapida (*)
Rhopalostylis sapida (Sol. ex G. Forst.) H. Wendl. & Drude, 1878
Nikau (Rhopalostylis sapida) is a palm tree, the only palm endemic to New Zealand.
Nīkau is a Māori word; in the closely related Eastern Polynesian languages of the tropical Pacific, it refers to the fronds or the midrib of the coconut palm.
The Nikau grows up to 15 m tall, with a stout green trunk which bears grey-green leaf scars. The trunk is topped by a smooth bulging crownshaft up to 1m long. The fronds are up to 3m long, and the closely-set, sometimes overlapping leaflets are up to 1 m long. The inflorescence is multi-branched and from 200 to 400 mm long. The tightly packed flowers are unisexual and coloured lilac to pink. Male flowers are borne in pairs, and have 6 stamens. The female flowers are solitary. The fruit is elliptic or oblong, and generally measures about 10 by 7 mm, and is red when ripe. The Nikau produces flowers between November and April, and fruits ripen from February to November, taking almost a year to fully ripen. These are a preferred food of the Kererū, the native wood pigeon.
Transplanting juveniles is generally successful if the main root is left intact. The Nikau does not have a true tap root. Once the main root has been established to a fairly shallow depth of about 400 mm) its roots take on form consistent with other palms. Successful transplanting is possible but the Nikau is very fickle if there's any trunk. It is best done in summer but a substantial root ball should be preserved, and shade should be provided at the new location - at the very least by tying the outer fronds closer to the centre. Ground watering is recommended because crown watering can induce terminal rot at the very slow growing new spike. Delays should be avoided in getting the Nikau into its new ground and substantial die-back of all but the central spike can be expected.
The Nikau thrives on cool temperatures but is not subject to freezing weather in its natural habitat. It can survive a few degrees of frost, but it is damaged even more severely by sudden large drops in temperature even above freezing. This makes it unsuitable in cultivation for places like Florida where severe cold snaps occur regularly. It does well in areas with a mild Mediterranean climate.
The Nikau palm shows considerable variation in the wild. Plants from the South Island and the offshore islands of the North Island have larger, more gracefully arching fronds and are popular in cultivation. The Chatham Islands form is particularly different, having a distinct juvenile form and larger fruits, and a thicker covering of fine hairs on the fronds. More research is needed into its precise relationship with the mainland form. The New Zealand Nikau palm is very similar to Rhopalostylis baueri of the Kermadecs and Norfolk Island, which can be distinguished by its more rounded or oval fruits, and by its leaflets which are broader than those found in most populations of R. sapida.
The Maoris found many uses for the Nikau palm. The bases of the inner leaves were eaten raw or cooked, also the young flower clusters. Food was wrapped in the leaves for cooking, and the old fibrous leaves were used for baskets, floor mats, and waterproof thatch for buildings.
1. ^ Polynesian Lexicon Project Online, entry nii-kau
 References and external links
* "Rhopalostylis sapida". New Zealand Plant Conservation Network. http://www.nzpcn.org.nz/flora_details.asp?ID=1259. Retrieved 2010-10-02.
Source: Wikipedia, Wikispecies: All text is available under the terms of the GNU Free Documentation License