kh854's picture

Fleabane?

Observed: 11th December 2009 By: kh854
S159 Neighbourhood Nature - current student
kh854’s reputation in Plantskh854’s reputation in Plants
species 17 a
species 17b
species 17c
species 17d
species 17e
Description:

Upright plant with yellow flowers at the top of stems which branch off from main stalk. Leaves are linear and and slightly hairy and have smooth margins

Identifications
Species interactions

No interactions present.

Species with which Canadian Fleabane (Conyza canadensis) interacts

Comments

Norwichnaturalist's picture

Probably right, but the

Probably right, but the Guernsey Fleabane is also present.
One way to tell is the stem will snap for the latter

Colin Jacobs.
Wild Flower Society member
Norwich
Norfolk
vc27
http://www.thewildflowersociety.com/

Chris Metherell's picture

Conyza

Very interesting comment about the stems snapping - not a feature I knew. I usually look at the hairs on the margins of the leaves - well-spaced straightforward hairs in C. canadensis and hooked hairs in C. sumatrensis. Does C. bonariensis snap in the same way or not? I always feel that it is C. sumatrensis and C. bonarensis which are difficult to tell apart, so if it didn't that would be very useful.

Chris Metherell
BSBI VC Recorder
North Northumberland

Norwichnaturalist's picture

Snap

we do not get bonarensis in Suffolk so not sure about this feature and until Xmas day will not be able to check John Poland's excellent vegatative guide.

Colin Jacobs.
Wild Flower Society member
Norwich
Norfolk
vc27
http://www.thewildflowersociety.com/

Chris Metherell's picture

Snap

Hi. I can save you the trouble. John does not mention it. He does mention all sorts of other features, not referred to by others, and in some cases quite different to the comments in other floras. It is interesting, if you have the time, to have Stace, Sell and Murrell, and Poland open in front of you and to compare the three for this genus. I think it's a bit of a tangle (as per Peter Sell's comments). I had a quick squint at some literature references last night - J.R. Palmer (BSBI News 64 p 22 (1993)) mentions the stem snapping character for C. sumatrensis, and also that he had found several intermediate plants.

Chris Metherell
BSBI VC Recorder
North Northumberland

Norwichnaturalist's picture

John Poland

will probably get all sorts of new id characters as the book becomes more used after Christmas and at least I will annotate mine with new features and pass them on. I have two one for the study and one for the field.

Colin Jacobs.
Wild Flower Society member
Norwich
Norfolk
vc27
http://www.thewildflowersociety.com/