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I thank the Kew TOBU Fund for financial support
of fieldwork in Vietnam, Thailand and the Lao P.D.R. The Keepers
and Curators of the following herbaria are thanked for assistance
during visits and for the loan of material: AAU, B, BM, BK, BKF,
BO, C, CAS, CMU, E, F, GH, HAST, HN, HNU, K, KKU, KUN, KYO, L, LE,
MO, NY, P, PSU, SAI, SING, TAI, TCD, UKM, UKMB, UNM, UC, US. The
staff of BK, BKF, HN and HNU and KUN is gratefully acknowledged
for their invaluable assistance and splendid company during fieldwork.
Thanks are due to Linda Gurr for skilfully executing the illustrations,
to Dr. Ching-I Peng, Institute of Botany, Academia Sinica, Taiwan,
for providing living material of Taiwanese P.
chinensis for study, to Alan Radcliffe-Smith for
providing the Latin diagnoses and to Dr A. Hay, Dr Dan Nicolson
and Dr Simon Mayo for critically reviewing the manuscript. Special
thanks are due to Kerry Taylor, University of the West of England,
a placement student who worked at Kew during 1996 97 compiling
an ALICE database of economically useful aroids, for contributing
the ethnobotanical data included in this paper.