Variation in Phormium cookianum (Agavaceae)

P Wardle

Abstract

Phormium cookianum contains two well marked geographic forms, one characteristic of lowland parts of the North Island, and the other of southern and mountainous parts of the South Island and the axial ranges in the North Island. They are clearly distinguishable by the colour of the outer tepals, which are green or yellow in the northern-lowland form, and red in the southern-mountain form. Other characters also distinguish them, although not so decisively.

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