Documented chromosome numbers are reported for 156 taxa (117 species, 3 subspecies, 8 varieties, 3 forma, 1 hybrid, and 24 of uncertain rank) from 24 families (54 genera) of angiosperms. Of these, 122 are for previously uncounted New Zealand taxa. Many of the counts are from poorly investigated families and genera, or from nationally uncommon and threatened, or newly described plants. In the majority of genera the numbers follow established patterns. Counts have now been obtained for all the New Zealand representatives of the Arecaceae and Urticaceae.
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Lange et al. (2002) studied this question.
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