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(1973). Moore left his "major groups" unranked, and his untimely death in 1980 prevented his completing a formal synthesis. J. Dransfield and N. W. Uhl

Genera of Vascular Plants. 2+ vols. Berlin etc. Vol. 2, pp. 438-453. Tomlinson, P. B. 1980. The Biology of Trees Native to Tropical Florida. Allston, Mass.

ed. 2. 26+ vols. Leipzig and Berlin. Vol. 17a(2), pp. 221-224. Tomlinson, P. B. 1980. The Biology of Trees Native to Tropical Florida. Allston, Mass.

regions. Species 3, possibly more (2 in the flora). Adams, D. C. and P. B. Tomlinson. 1979. Acrostichum in Florida. Amer. Fern J. 69: 42--46. García de López

Sleumer indicated that anthers in pin flowers lack pollen; however, P. B. Tomlinson (1980) stated that the heterostylous condition is apparently efficient, given

the adaxial hairs on the petals may serve to present the pollen (P. B. Tomlinson 1980). Variety americana shows different growth forms on different substrates;

staminate and pistillate flowers are here referred to as bracteoles (P. B. Tomlinson 1980) but have also been interpreted as vestiges of sepals (G. L. Webster

temperate areas, but it is apparently no longer found in natural stands (S.Y. Hsu 1980). The indigenous North American orders all possess pollen cones separate

2: 437--480. Ehrlich, P. R. 1980. The strategy of conservation, 1980--2000. In: M. E. Soule and B. A. Wilcox, eds. 1980. Conservation Biology. An Evo