Peter M McEvoy's picture

Plant in ditch

Observed: 2nd April 2010 By: Peter M McEvoy
Botanical Society of Britain and IrelandNew Flora of the Isle of Man
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Peter M McEvoy's picture

ID

Chris,

this species has cropped up a few times on Ispot with Callitriche ID, but it looks like Crassula to me. Can you confirm your reasoning for Callitriche over Crassula?

New Flora of the Isle of Man

http://iomflora.site11.com

Chris Metherell's picture

ID

Peter,

Vegetatively I've always tended to separate these two simply on the basis that C. helmsii has rather fleshy leaves with effectively no veins and Callitriche spp. flat leaves with a single central vein (assuming there are no floating leaves to look at). Of course often Callitriche has notched leaves, but not always! These looked a little flat for Crassula that's all really. Otherwise they look similar in the extreme in my view, and the research I've done does not suggest that anyone else has come up with a better methodology until there are flowers or floating leaves, when of course it's easy to tell them apart.

Of course you've had the plant in your hands and will be able to make a much better asessment.

Chris

Chris Metherell
BSBI VC Recorder
North Northumberland

Peter M McEvoy's picture

Hi Chris, Thanks for the

Hi Chris,

Thanks for the info. Based on your notes I would asdd that the plant has no centrla vein, leaves are slightly fleshy (likely to have been submerged) and there is no notched tip to the leaf. If I can get a binocular microscope picture I will post.

New Flora of the Isle of Man

http://iomflora.site11.com