1. Augspurger CK (1980) Mass-flowering of a tropical shrub (Hybanthus prunifolius): Influence on pollinator attraction and movement. Evolution 34:475?488
2. Baker HG, Bawa KS, Frankie GW, Opler PA (1983) Reproductive biology of plants in tropical forests. In: Golley FB (ed) Tropical rain forest ecosystems, Elsevier Scientific, New York, pp 183?215
3. Baker HG, Hurd P (1968) Intrafloral ecology. Ann Rev Ent 13:385?414
4. Buchmann SL, Shipman CW (in prep.) Optimal nectar feeding rates in Apis mellifera (Hymenoptera: Apidae)
5. Corbet SA, Willmer PG (1981) The nectar of Justicia and Columnea: Composition and concentration in a humid tropical climate. Oecologia (Berlin) 51:412?418