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Analysis by GC and GC-MS of the essential oil obtained from aerial parts of Erechtites hieracifolia revealed 22 components (93% of the total composition). The major constituents were found to be ˛-pinene, myrcene, (E)-ˇ-ocimene, (E)-caryophyllene and germacrene D; the enantiomeric distribution of ˛- pinene, sabinene, ˇ-pinene, limonene and linalool was studied by multidimensional HRGC-HRGC. The major component was ˛-pinene (48%) with an enantiomeric purity of 100% for (1R)-(C)-˛-pinene. Copyright  2001 John Wiley & Sons, Ltd.

In 1930 the writer published in this journal an account of the vegetation of Heart's Content forest listing the plants then known to occur within the area. The stand is a remnant of the primeval forest which formerly covered much of northwestern Pennsylvania. A number of foresters and botanists, appreciating its ecological importance, have developed a lively interest in the area. Since 1928, when the initial studies were made, the place has been visited every summer and a number of additional species collected. The object of this paper is to record these species. The Scirpus sp. was immature but appeared to be S. cyperinus; it was impossible to collect flowers or fruit of either Ribes rotuzdifoliwni or Crataegus tenella, hence the identification of these species remains tentative. Some of the plants here reported seem to be recent invaders rather than natural components of the virgin forest. During the summer of 1929 cutting of immediately adjacent areas was completed, exposing the south and east sides of the virgin forest block. This exposure to sun and wind has certainly altered natural conditions within a considerable part of the forest and has made entry of a number of ruderals possible. A further factor in accounting for the recent arrivals seems to be the increasing use of the area by the public. Among the species which represent recent arrivals in the area are Dactylis glomerata, Agrostis alba, Populis tremiloides, P. gr iididentata, Rumex acetosella, Polygomurn acre, Phytolacca decaundra, Lysimacliia qunadrifolia, SolanxUn dulcamtara, Bidens discoidea, Erechtites hieracifolia, and Hieracium aurantiaci1n. Plants occurring only in the grazed portion of the forest are not included. Information on such species may be obtained from an earlier paper by the writer.