Artificial hybridisation of new zealand species and varieties of Epilobium

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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 F1 only, and all of these were more or less weak, failing to produce flowers in all but a few cases; the F1 progeny of four crosses were self-sterile but on backcrossing produced BC1; 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.

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