New Zealand Journal of Botany abstracts

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Floral protogyny, self-compatibility and the pollination of Ourisia macrocarpa (Scrophulariaceae)

MARK A. SCHLESSMAN

Department of Biology
Box 187, Vassar College
Poughkeepsie, NY 12601, U.S.A.

Abstract The simple gullet flowers of Ourisia macrocarpa are borne in sequentially blooming whorls. They are pollinated primarily by small hal- ictids and syrphids. The plants are self-compatible. Hemisynchronous, multi-cycle, incomplete proto- gyny allows both autogamous and geitonogamous selfing. Autogamy is infrequent due to movements of stamens and styles, and to allogamous pollina- tion during the female stage. Minimum and maxi- mum estimates of the frequency of geitonogamous pollinations are 2.4 and 31.2%. Avoidance of self- pollination is probably the most important selec- tive force that has favoured floral protogyny.

Keywords Ourisia macrocarpa; Scrophulari- aceae; New Zealand; pollination; protogyny; auto- gamy; geitonogamy; self-compatibility; floral despecialisation

Received 24 March 1986; accepted 6 May 1986
New Zealand Journal of Botany, 1986, Vol. 24: 651-656
0028-825X/86/2404-0651$2.50/0 © Crown copyright 1986

PDF file of entire paper: medium quality (934K); (scanned from paper original: notes about this process)

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