I'd say Iroko.
Along with Laburnum and Yew, one of the most toxic timbers in terms of dust inhalation:
http://baysidewoodturners.com/media/QLD_Wood_Dust_Health_Concerns_ITD%20Guidelines%20Draft%20-%20August%2024,%202012.pdf
I'm not 'shroud waving' - I've turned all of those timbers, but with...