New Zealand Journal of Botany abstracts

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ARTIFICIAL HYBRIDISATION OF NEW ZEALAND SPECIES AND VARIETIES OF EP1LOBIUM

W. B. Brockie

Richmond, Nelson

Abstract Interfertility tests among New Zealand species and varieties of Epilobium were carried out by means of artificial cross-pollination involving 34 species, three varieties, one apparently true-breeding but suspected hybrid-derived form, and one form which may warrant description as a new species. Of 511 crosses, 285 produced an F₂; 116 produced Fj only, and all of these were more or less weak, failing to produce flowers in all but a few cases; the Fi progeny of four crosses were self-sterile but on backcrossing produced Bd; 106 of the 511 crosses either did not set seed or the seed failed to germinate. Of 75 reciprocal crosses, 21 gave dissimilar results, but in every case one of the dissimilar pairs either did not set seed or the seed did not germinate. Brief details of the results of the individual crosses are given, and a figure also depicts the results. No attempt is made to analyse the results from an evolutionary viewpoint.

N.Z. Jl Bot. 4: 366-91
(Received for publication 4 November 1965)

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