This work deals with three medicinal species of Compositae in relation to the botanic-diagnostic, physical-chemistry and phytoterapic aspects, considering the seazonal variations. The level of humidity and ashes seems to have no seazonal variations. Bacharis trimera DC did not shows qualitative variations in its composition of saponins and flavonoids. Solidago microglossa DC presented alkaloids only at the summer and winter. Its flavonoidic and tanninic compositions, however, did not shows qualitative variations. Achillea millefolium L. has alkaloids, cianogenic heterosides, tannins and flavonoids all the year long. The saponinic fraction lacks at the summer however, just when the phenols show up, after disappearance at the spring and in the winter.
Compositae; Asteraceae; Achillea millefolium L.; Bacharis trimera DC; Solidago microglossa DC; phyto-chemistry