Most informative, Anita, thanks.
The toxicity I was referring to was re humans rather than other plants.
It is alluded to in the Wiki entry:
"Toxicity and allergic reactions
The flowers and fruit contain toxic hydrogen cyanide.[4] Tridecylresorcinol in G.robusta is responsible for contact dermatitis.[5]
...
5. Menz, J., Rossi, R., Taylor, W.C, Wall, L., Contact dermatitis from Grevillea'Robyn Gordon', Contact Dermatitis, Vol. 15, Iss. 3, pp 126-131, Apr 2006"
and
"Severe body rash and allergic dermatitis" (
http://www.dpi.nsw.gov.au/__data/assets/pdf_file/0008/112796/garden-plants-poisonous-to-people.pdf)
(Mind you, the same site says of Melia azederach "Nausea, spasms, drowsines then convulsions, death.")