New Zealand Journal of Botany abstracts

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CYTOGENETIC STUDIES IN THE GENUS LUZULA IN NEW ZEALAND

Hedda Nordenskiold

Institute of Plant Systematics and Genetics, Royal Agricultural College, Uppsala, Sweden

Abstract Chromosome numbers are given for 16 taxa belonging to nine species of the subgenus Gymnodes. Seven species in the campestris-mulliflora complex are uniformly diploid with 2n = 12. Two species in the "racemosa group" are pseudo-octoploids with quarter-sized chromosomes: L. trarersii (Buch.) Cheesem. (two vars) has 2n = 46 ard L. ulophylla (Buch.) Ckn. et Laing, 2n = 48. Crosses within and between the New Zealand taxa of the campestri s-multi flora complex are usually fully fertile, though several F₂'s have reduced fertility and some dwarf cushicn-like plants and chlorophyll-deficient seedlings occur. Hybrids between New Zealand and Australian taxa are less fertile than those within New Zealand taxa, and hybrids between New Zealand taxa and species of the Northern Hemisphere are almost, or completely, sterile.

N.Z. Jl Bot. 4 : 185-95 (Received for publication 30 December 1965)

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