Andrew Broome ajbroome@xtra.co.nz
Wed, 12 Nov 2003 01:34:09 PST
Uli said...

> ... there is also an Oxalis group on Yahoo

Thanks for the plug.  New members are always welcome, see my web page
at http://www.oxalis.50megs.com/ or contact me for info.

>There is also Oxalis articulata ... never a weed.

O. articulata is certainly one of the weed species in New Zealand
(along with O. pes-caprae, O. corniculata, O. incarnata and a plant
I think is probably O. compressa).  It's not as widespread here as
the other species, with O. pes-caprae and especially the freely seeding
O. corniculata forms being the most invasive and therefore the most 
despised by NZ gardeners.

> This one definetely flowers all year in suitable conditions and is widespread 
> in mild European gardens and is perhaps hardier than expected.

Here it flowers in spring (ie now) and is rarely seen at other times. It seems
to go dormant at the first sign of drought.

> ... having doubts about O. incarnata, there is nothing red about it as the
> implies) ...

Salter says O. incarnata has white or pale lilac flowers, this matches the one
I see flowering freely in shady places here at the moment.

> ... with masses of scented flowers ...

I've never noticed an odour with this species, I must investigate further.

Mike said...

>--They don't set seeds.  I think I have seen one seed pod in the last five
>years.  I don't know if they are just sterile, or they are not getting the
>right pollinator.  

Some of the reason that Oxalis don't set seed is down to basic problems due
to the tristylous nature of many of the species.  I've got a couple of O. hirta
forms and have seen a seed pod (but was too slow to collect the seed), maybe
next year?

Anyway, I'm looking forward to more discussion on my favourite bulb genus.  :)


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