I am looking for a cross-section diagram that must be labeled, of
either a cholla cactus or a saguaro cactus.

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Request for Question Clarification by justaskscott-ga on 09 Apr 2003 20:03 PDT

Will the images, in combination with the descriptions, on this page be
sufficient as an answer?

"The Anatomy of Opuntia littoralis", Naomi Fraga (2001)
Anabaena.net
http://anabaena.net/anatomy/

(Normally, I don't post a potential answer as a request for
clarification.  The temptation of some people would be to accept the
answer for free.  However, I will have to trust you here, because
there's no way for me to make this request without showing you the web
page.)

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Clarification of Question by meister-ga on 09 Apr 2003 23:20 PDT

Although these diagrams are cross sections - we were looking for
something much simpler.  This is for my 13 year old's science project.
 Thank you for your time.

Hello Meister,

I was only able to locate a photograph of a cross section of a stem of
a saguaro cactus.

Fig. 4: Cross section of stem showing details of piths (p) and
secondary wood (x), note additional strands of wood traversing the
ground tissue (r).
Arizona State University: Life Sciences
http://lsvl.la.asu.edu/plb306/kpigg/studentproj/saguaro.htm

I hope this helps - I'll be happy to post this as an answer if it
satisfies your request.

Best Regards,
Bobbie7

Unfortunately I needed the diagram to have labels.  I had found that
site originally but needed much more detail than it offered.  Thank
you.