Abstract
The Monteregian Hills are a series of eight mountains, intrusive in nature, which form a distinct petrographical province in the St. Lawrence Lowlands of Southern Quebec. Mont St. Hilaire, one of the larger members of the group, was bequeathed to McGill University as a natural area for scientific research in 1959 by the late Brigadier A. Hamilton Gault. During a survey of the natural resources of the mountain throughout the summer of 1959, botanical investigations of the flora and vegetation were conducted. The present report is the first in a series that will present the results of these studies. It is concerned with the general characteristics of the mountain and the known existing flora.

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