Abstract
Abstract The range of distribution of Chionochloa oreophila (snow patch grass), altitudinally and geographically, throughout the mountains of the South Island, New Zealand, is outlined. The floristic composition of 31 samples of C. oreophila-dominant vegetation indicates that the vegetation is fairly uniform, but there are regional differences. Few of the species present are confi!led to C. oreophila vegetation but many occur in open habitats of various kinds in the subnival and alpine zones and some others are distributed widely in alpine grasslands. Other vegetation samples show that C. oreophila plays a subordinate role and is uncommon or rare in alpine cushion vegetation which occurs in sites with extreme environmental conditions. It is only sparsely present, if at all, in closed alpine grasslands dominated by other Chionochloa species. C. oreophila occupies a narrow niche at the uppermost limits of closed alpine vegetation, between alpine grasslandli where taller grasses dominate, and subnival barren...
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