Could I get a weed ID please - Page 2

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Posted by Eigenvector on July 6, 2008, 12:02 pm
 
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So here are more shots, of the body.  It's tough to get a good clear shot of
something that is 3 feet long and pencil thin.
Here is the base of the weed
http://photos.imageevent.com/eigenvector/various/websize/P7060210.JPG
Here is an attempted total shot of a smaller one
http://photos.imageevent.com/eigenvector/various/websize/P7060211.JPG
Here is a shot of an immature one growing where they seem to grow best - in
cracks
http://photos.imageevent.com/eigenvector/various/websize/P7060212.JPG

The yellow buds at the ends are flowers.  They are small 5 petal flowers
about 1/2" in diameter, the petals are long and thin and arranged in a nice
pentagonal shape.  I'm almost inclined to think that these are some kind of
Hawkweed.



Posted by Stewart Robert Hinsley on July 6, 2008, 1:23 pm
 
OK, I had the scale wrong.

If it is some sort of hawkweed, that's more or less what I said. But if
it is, then the yellow things are capitula, not flowers. (The "flower"
of a daisy is a flower head composed of many florets, technically called
a capitulum.)

The only daisy I know with 5 florets in a head (and therefore a really
good imitation of a single flower) is wall lettuce, Mycelis muralis.

      http://commons.wikimedia.org/wiki/Mycelis_muralis

[Some daisies have ligulate florets, some have tubular florets, and the
majority of both. There is a large group with only ligulate daisies,
which comprise the tribe Cichorieae. These include lettuces, sow
thistles, hawkweeds, dandelions, and many others. The number of rings of
florets, and the number of florets in a ring varies greatly. Those with
a single ring of florets include the lettuces (Lactuca), wall lettuces
(Mycelis) and, IIRC, alpine sow thistles (Cicerbita), and any others
that have escaped my attention or knowledge. Mycelis is the only one,
AFAIK, that has only 5 florets.]
--
Stewart Robert Hinsley

Posted by Eigenvector on July 6, 2008, 4:33 pm
 

You nailed it - Wall lettuce.

thanks a lot for the help.