-(Floristic composition of a "cerrado" sensu stricto remnant in Botucatu, SP). A floristic survey of a "cerrado" sensu stricto area was carried out in Botucatu, west-central region of São Paulo State, southeastern Brazil. One-hundredseventy-nine angiosperms taxa (177 species) were recorded distributed in 122 genera and 49 families. Five species of pteridophytes were also collected, belonging to four genera and two families. The woody component was predominant, representing more than 60% of the registered species. The arboreal to non-arboreal species ratio was 1:3. The families with the highest species richness were: Asteraceae (27 species), Fabaceae (22), Myrtaceae (11). The comparison among six cerrado areas revealed great floristic heterogeneity since the similarity indexes produced low values, even among neighboring areas.Key words -"cerrado" floristic, profile diagram, similarity RESUMO -(Composição florística de remanescente de cerrado sensu stricto em Botucatu, SP). Realizou-se o levantamento florístico de uma área remanescente de cerrado sensu stricto no Município de Botucatu, região centro-oeste do Estado de São Paulo, Sudeste do Brasil. Foram registrados 179 táxons de angiospermas (177 espécies) distribuídas em 122 gêneros e 49 famílias e cinco espécies de pteridófitas pertencentes a quatro gêneros e duas famílias. O componente lenhoso foi predominante representando mais de 60% das espécies registradas. A proporção das espécies arbóreas para as não arbóreas foi de 1:3. As famílias com maior riqueza foram: Asteraceae (27 espécies), Fabaceae (22), Myrtaceae (11). A comparação entre seis áreas de cerrado revelou grande heterogeneidade florística uma vez que os índices de similaridade produziram valores baixos, mesmo entre áreas próximas.Palavras-chave -diagrama de perfil, florística do cerrado, similaridade 1.Parte da dissertação de mestrado do primeiro autor, Programa de

The Cerrado (Brazilian savanna) has suffered massive destruction in recent years, mainly due to the expansion of agricultural areas. Many remnants of this vegetation are still poorly studied. Therefore, the purpose of this study was to carry out a floristic survey in a remnant of Cerrado in the municipality of Pratânia, central-west region of state of São Paulo, southeastern Brazil. In total, 120 species (38 families, 88 genera) were registered. The families with greater richness were: Fabaceae (23 species), Asteraceae (15), Myrtaceae (10), Malpighiaceae and Rubiaceae (seven each) and Bignoniaceae (five). The shrub component was predominant in the study area representing 37.5 % of the recorded species. A comparison among eight Cerrado areas showed greater similarity between areas with similar altitude.

ABSTRACT

This study aims to characterize and compare three Cerrado areas (one cerradão and two cerrado sensu stricto areas) in Patrânia, São Paulo state, southeastern Brazil, concerning the floristic composition. In total, 250 taxa were found belonging to four species of pteridophytes, one species of an exotic gymnosperm and 243 species of angiosperms. Differences in species number and proportion of the woody and herbaceous components were observed among the three Cerrado areas. The similarity analysis revealed that the cerradão seems quite peculiar, showing low similarity level with the cerrado sensu stricto areas contiguous to it, being more similar to other cerradão areas located in nearby municipalities.

-(Community structure and comparative analysis of the woody component of a cerrado remnant in Southeastern Brazil). The aims of the present work were to carry out a floristic-structural study of the shrubby-arboreal component of a savanna fragment (cerrado sensu stricto) in São Paulo State, Southeastern Brazil, and to compare with other areas. Twentyone plots of 250 m² each were delimited and plants with stem basal diameter equal or superior to 3 cm were included in the sampling. The recorded individuals corresponded to 3,062 and 58 species belonging to 34 families were registered. Asteraceae had the largest number of species (seven), followed by Fabaceae and Myrtaceae (five each). The most important species were Tibouchina stenocarpa and Anadenanthera falcata. The floristic composition of the study area indicates that it might be considered a transition from cerrado to seasonal semi-deciduous forest. The comparison with other surveys indicates floristic-structural heterogeneity of these cerrado areas and the multivariate analysis showed that areas grouped according to their geographical position and soil type. Key words: phytosociology, savanna, similarity RESUMO -(Estrutura da comunidade e análises comparativas do componente lenhoso de um remanescente de cerrado na região Sudeste do Brasil). O presente estudo teve como objetivo realizar um levantamento florístico-estrutural da comunidade arbustivo-arbórea de um fragmento de cerrado sensu stricto no Estado de São Paulo e compará-lo com outras áreas de cerrado. Foram delimitadas 21 parcelas de 250 m 2 cada onde as plantas com diâmetro basal do caule igual ou superior a 3 cm foram incluídas na amostragem. Foram registrados 3062 indivíduos pertencentes a 58 espécies e 34 famílias. Asteraceae apresentou o maior número de espécies (sete), seguida por Fabaceae e Myrtaceae (cinco cada). As espécies mais importantes foram Tibouchina stenocarpa e Anadenanthera falcata. A composição florística da área de estudo indica que esta pode ser considerada como uma transição entre cerrado e floresta estacional semidecídua. A comparação com outras áreas indicou que há considerável heterogeneidade florístico-estrutural nas áreas de cerrado e as análises multivariadas mostraram que as áreas comparadas se agruparam de acordo com sua posição geográfica e tipo de solo.