João Henrique G. Lago* and Paulete Romoff, José R. Pirani, Nídia F. Roque

Abstract: The essential oils isolated from leaves of Guarea macrophylla var. tuberculata collected monthly during two years (from November 1997 to October 1999) were subjected to GC-FID and GC/MS analysis. The obtained data showed a significant variation in the proportions of the components, which could be associated to species phenological state despite of climatic parameters in each collection.

Plant Name <i>Guarea macrophylla</i> Vahl var. <i>tuberculata</i> Vellozo (Meliaceae) Source Leaves of <i>G. macrophylla</i> var. <i>tuberculata</i> were collected monthly (each 15th day) from November 1997 to October 1999 from the same specimen. The species identification was done by Dr. José Rubens Pirani from Instituto de Biociências at Universidade de São Paulo, in which Herbarium the voucher specimen has been deposited. Previous Work <i>Guarea macrophylla</i> var. <i>tuberculata</i> occurs in Brazil in the States of Rio Grande do Sul, Rio de Janeiro, Minas Gerais, Mato Grosso and Amazonas. This tree is known in Brazil as “Ataúba” and blossom between October to February (summer), mainly in November and December, and bears fruits from June to October (winter) (1). Previous reports describe the composition of this species, in which several terpenoids have been described (2–5). The essential oil from the leaves, stem bark and fruits were previously analyzed (6–8) but there is no information about their dynamics. Therefore, in this paper, second report on the oil from <i>G. macrophylla</i> var. <i>tuberculata</i> leaves, we describe the variation in the proportions of the components of the oil during two years (24 collections – from November 1997 to October 1999).