An Interactive Key (lucid) For The Identifying Of The Genera Of Seed Plants From The Ducke Reserve, Manaus, Am, Brazil

The identification of Amazonian plants is still difficult for many reasons, one being the lack of collections over large areas of the region. As a consequence of the poor knowledge on the Amazonian flora, many taxonomic publications (revisions and floristic treatments) become out of date within a few years. In this context, the on-line publication of taxonomic treatises has been suggested, since it allows constant data updates; and this type of publication should therefore be more valued by the scientific community. An excellent field guide for the Ducke Reserve (Manaus, central Amazonian Brazil) was published, based exclusively on vegetative characters. However, the presence of reproductive structures in the collected material does not facilitate identification with this type of field guide. Furthermore, as in any printed key, the text cannot be updated, except through a new edition. As an example of a way to facilitate the identification of Amazonian plants, an interactive, multiple-entry key to the seed plant genera that occur in the Ducke Reserve was created using the program Lucid 3.5. The key includes vegetative and reproductive characters and many illustrations, and is available on-line. We discuss here the peculiarities and advantages of this type of electronic publication.6315564Araújo, J.S., Bittrich, V., Amaral, M.C.E., (2005) Chave Interativa Para Identificação de Famílias Demonocotiledôneas Do Estado de São Paulo, , http://www.ib.unicamp.br/plantkeys, Availablein. Access on 20 Jun 2011Bisby, F.A., The quite revolution: Biodiversity informatics and the internet (2000) Science, 289, p. 2312Bittrich, V., Chaves on-line: modelos, dificuldade e potencialidades (2008) Atualidades, Desafios e Perspectivas da Botânica No Brasil. Anais Do 59° Congresso Nacional de Botânica, pp. 367-368. , Loiola, M.I.B.Baseia, G.I.Lichston, J.A. (orgs.). 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Leaf Morphology Of Saplings And Adult Individuals Of Caesalpinia Echinata Lam. In A Semidecidual Forest Of Southern Bahia, Brazil [morfologia Foliar De Indivíduos Jovens E Adultos De Caesalpinia Echinata Lam. Numa Floresta Semidecídua Do Sul Da Bahia]

Caesalpinia echinata Lam. (Caesalpiniaceae) is a tree species that naturally regenerates in the forest understory and reaches the upper canopy through small gaps. We conducted a study with the objective of comparing some aspects of leaf morphology of adult individuals, in which the leaves were exposed to full sunlight, and saplings, grown in the forest understory. The study was conducted in a semidecidual forest in Jussari, southern Bahia, Brazil. Initially, eight adult and eight sapling individuals were selected and marked. In September/October, 2004 and April, 2005 eight leaves for each adult and three leaves for each sapling individual were collected and analyzed. In general, the area of leaves, rachis and leaflets, the length of rachis, the width of leaves, the number of pinnes and the dried mass of leaves were significantly higher in young individuals. Notwithstanding, the specific mass of leaves and leaflets were significantly higher in the adults. 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