INFO on Senecio jacobaea

Stefan Andersson sysbot-stefana at MACPOST.LU.SE
Mon Nov 20 15:37:52 CST 1995

Dear Collegues,
I am interested in the pollination biology of composites, including Senecio=
jacobaea, a plant with flower heads consisting of central disc florets and=
marginal ray florets (rays). Rayless plants are known from Britain, on the=
Baltic island of Gotland etc, but little is known about the occurrence of=20
rayless plants outside these areas. Given the wide range of S. jacobaea (na=
in Eurasia, naturalized in North America, Australia, etc) and the relativel=
weak effect of rays on pollinator attraction (unpublished results), I suspe=
that the loss of rays has occurred in many areas. To test this hypothesis, =
would be grateful for the following information:  =20
Have you seen rayless plants in your 'study area'? (negative results are al=
so of=20
Did you see a single plant, a few scattered plants, or a population fixed f=
the rayless morph?
Location (nearest village or city; state; country) and year.
Any other information?

Please respond to my email address:
stefan.andersson at

Thanks in advance!
Stefan Andersson
Department of Systematic Botany
University of Lund
O. Vallgatan 18-20
S-22361 Lund

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