thorny question

Allan Shanfield anshanfield at UCDAVIS.EDU
Wed May 17 10:12:55 CDT 2000

Dumb question, but...are the thorns of Euphorbs in Africa (convergent to
New Wld Cacti) largely a function to deter grazing since the "milk" is so
toxic, or could it also be a thermo-regulation issue too? Or...involved in
PS and respiration concomitantly?

Allan Shanfield
PhD Candidate
UC Davis

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