Syst. Zool. 30:1-11. 
Werff, H. van der. 1987a. A revision of Mezi/aurus (Lauraceae). Ann. Missouri Bot. Gard. 
74:153-182. 
. 1987b. Six new species of neotropical Lauraceae. Ann. Missouri Bot. Gard. 
74:401-412. 
. 1988. Eight new species and one new combination of neotropical Lauraceae. 
Ann. Missouri Bot. Gard. 75:402-419. 
. 1991a. A key to the genera of Lauraceae in the New World. Ann. Missouri Bot. 
Gard. 78:377-387. 
. 1991b. New species of Lauraceae from Ecuador and Peru. Ann. Missouri Bot. 
Gard. 78:409-423. 
. 1993. A revision of the genus Pleurothyrium (Lauraceae). Ann. Missouri Bot. 
Gard. 80:39-118. 
Wheelwright, N. T. 1983. Fruits and the ecology of resplendent quetzals. The Auk 100:286-301. 
. 1986. A seven-year study of individual variation in fruit production in tropical 
bird-dispersed tree species in the family Lauraceae. in A. Estrada & T. H. Fleming. 
(eds.) Fugivores and seed dispersal. Dr. W. Junk Publishers, Dordrecht. pp. 19-35 
, W. A. Haber, K. G. Murray & C. Guindon. 1984. Tropical fruit-eating birds and 
their food plants: A survey of a Costa Rican lower montane forest. Biotropica 
16:173-192. 
Wiley, E. O. 1975. Karl R. Popper, Systematics, and Classification: A replay to Walter Bock and 
other evolutionary taxonomists. Syst. Zool. 24: 233-243. 
257 
