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Abstract

The present paper gives an account of different life forms and biological spectrum of Dehradun and Mussoorie,constructed after enumeration of floristic composition of the region.Phanero-therophytes&Hemicryptophytes predominated the Dehradun and Mussoorie respective areas.InMussoorie Hemi cryptophytes. showed maximum deviation (+24%) followed by Phanerophytes(+12% Dehradun) with normal biological spectrum of Raunkiaer Biological spectrum.Biological spectrum is a mirror reflection of the floristic composition of the area and in Dehradun,Sal(Shorearobusta) forms dominant vegetation and shows maximum frequency, adundance ,density and presence &constance.The dominance of Phanero-therophytes in Dehradun attributed to humid bio-climates and xeric conditions. Mussoorie which is near to Dehradun shows wide disparity due probably to high altitude which make the prevailing climate cold and temperate in nature.The biological spectrum is thus useful as an index of the health status of a forest and the mirror reflection of area phytoclimate.