Re: Morning Glory -Convolvulus arvensis and C. sepium

david feix wrote:
> 
> For Bob and Moira,
> 
> The white flowering morning glory I saw in Seattle was
> definitely not the common bindweed, Convolvulus
> arvensis, which I would have certainly recognized;...  The vine I was asking about, and has been> tentatively identified by Diane as Convolvulus sepium,
> is a much larger growing vine with larger leaves and
> flowers which are also much larger, about 3 to 4" in
> diameter, pure white in color, and on a vigorous vine
> with deep green leaves and thick stems more similar in
> appearance to the common Blue Dawn Morning
> Glory/Ipomoea acuminata.  

David
This actually sounds a bit too big, (especially the flowers) for
Calystegia (convolvulus) sepium (6 cm), and much too big for Convolvulus
arvensis (3cm). Though I cannot measure mine at present (they are
dormant just now) I have always considered mine to be the larger brother
Calystegia sylvatica (the Great Bindweed) whose flowers can go to 8cm
diameter and which will certainly grow and flower in shade. However it
is immaterial which I have from the botanical point of view, as all are
equally badly-behaved and not one of the three can be safely welcomed in
the garden.

I am not personally familiar with C arvensis, which does not grow in my
district, but from its description in my weed book I am forced to say "a
bindweed is a bindweed is a bindweed" and all of this trio at least
should be avoided.

At the very least I beg you to investigate the underground part of the
bindweed you have in mind before acquiring any of it.

Moira
-- 
Tony & Moira Ryan <theryans@xtra.co.nz>
Wainuiomata, New Zealand, SW Pacific. 12 hours ahead of Greenwich Time
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