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Evolution and Distribution of Grasses
Vol 68, Page 5, Date 1981
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Some Evolutionary Trends in the Bambusoideae (Poaceae)
Vol 68, Page 15, Date 1981
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Evolution of Reproductive Systems in the Gramineae
Vol 68, Page 48, Date 1981
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Coevolution of Grasses and Herbivores
Vol 68, Page 75, Date 1981
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Grasses and the Culture History of Man
Vol 68, Page 87, Date 1981
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Three New Species of Flourensia (Asteraceae-Heliantheae) From South America
Vol 68, Page 105, Date 1981
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New Species and a New Combination in Palmae, Theaceae, Araliaceae, Apocynaceae, and Bignoniaceae From the Choco and Amazonian Peru
Vol 68, Page 112, Date 1981
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A New Peruvian Styloceras (Buxaceae): Discovery of a Phytogeographical Missing Link
Vol 68, Page 122, Date 1981
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Four New Species of Dioscorea From Amazonian Peru
Vol 68, Page 125, Date 1981
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Systematics, Phylogeny and Evolution of Dietes (Iridaceae)
Vol 68, Page 132, Date 1981
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Additions to the Ericaceae of Panama
Vol 68, Page 154, Date 1981
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Additional Panamanian Species of Burmeistera (Campanulaceae: Lobelioideae)
Vol 68, Page 167, Date 1981
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Sapotaceae of Panama
Vol 68, Page 172, Date 1981
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The Mexican and Central American Species of Adelobotrys (Melastomataceae)
Vol 68, Page 204, Date 1981
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New Taxa From the Uplands of Western Panama
Vol 68, Page 213, Date 1981
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New Species of Connarus (Connaraceae) From Peru
Vol 68, Page 218, Date 1981
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Chromosome Numbers of Miscellaneous Angiosperms
Vol 68, Page 222, Date 1981
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A New Species of Hernandia (Hernandiaceae) From Panama
Vol 68, Page 224, Date 1981
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Pectis Linifolia (Compositae: Tageteae) Added to the Flora of Panama
Vol 68, Page 225, Date 1981
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Setaria Variifolia (Swallen) Davidse, A New Combination (Gramineae: Panicoideae)
Vol 68, Page 226, Date 1981
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Errata: Structural, Behavioral, and Physiological Adaptations of Bees (Apoidea) for Collecting Pollen
Vol 68, Page 231, Date 1981
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Dispersal Versus Gene Flow in Plants
Vol 68, Page 233, Date 1981
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Evolution of Sexual Systems in Flowering Plants
Vol 68, Page 254, Date 1981
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On the Evolution of Complex Life Cycles in Plants: A Review and an Ecological Perspective
Vol 68, Page 275, Date 1981
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Floral Rewards: Alternatives to Pollen and Nectar
Vol 68, Page 301, Date 1981
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Geographical Aspects of Bird-Flower Coevolution, with Particular Reference to Central America
Vol 68, Page 323, Date 1981
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The Distributional Patterns of New World Nectar-Feeding Bats
Vol 68, Page 352, Date 1981
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The Energetics of Pollination
Vol 68, Page 370, Date 1981
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Reproductive Structures and Evolution in Ludwigia (Onagraceae). III. Vasculature, Nectaries, Conclusions
Vol 68, Page 379, Date 1981
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Systematics and Biology of Homeria (Iridaceae)
Vol 68, Page 413, Date 1981
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Nectarivory and Potential Pollination by a Neotropical Marsupial
Vol 68, Page 505, Date 1981
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A Contribution to the Floral Biology and Reproductive System of Couroupita Guianensis Aubl. (Lecythidaceae)
Vol 68, Page 514, Date 1981
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A Preliminary Note on Pollination in the Chenopodiaceae
Vol 68, Page 524, Date 1981
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Studies in Ipomoea (Convolvulaceae) I. The Arborescens Group
Vol 68, Page 527, Date 1981
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Chromosome Cytology of Burniaceae
Vol 68, Page 546, Date 1981
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Chromosome Numbers in Legumes II
Vol 68, Page 551, Date 1981
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A Note on the Rediscovery of Argyrolobium Involucratum (Thunb.) Harv. and the Generic Borderline Between Argyrolobium and Melolobium (Fabaceae- Crotalarieae)
Vol 68, Page 558, Date 1981
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Notes on the Cytology and Distribution of Anapalina, Tritoniopsis, and Sparaxis, Cape Iridaceae
Vol 68, Page 562, Date 1981
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A Revision of Syngonium (Araceae)
Vol 68, Page 565, Date 1981
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Life-Cycle Variation in Geophytes
Vol 68, Page 652, Date 1981
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Haplomitrium Monoicum, A Remarkable New Species of Calobryales (Hepaticae) from New Caledonia, Together with a Reclassification of Subg. Haplomitrium
Vol 68, Page 668, Date 1981
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Two New Species of Bonafousia (Apocynaceae) from Panama and Colombia- Ecuador
Vol 68, Page 677, Date 1981
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Studies in the Capparidaceae XV: Capparis Panamensis, N. SP
Vol 68, Page 681, Date 1981
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On the True Identity of Lagenanthus Parviflorus Ewan (Gentianaceae)
Vol 68, Page 685, Date 1981