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Provisional List of Plants Found in lake Melville and Hamilton Inlet District—Continued.


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p. 2373

Provisional List of Plants Found in lake Melville and Hamilton Inlet District—Continued.


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Provisional List of Plants Found in lake Melville and Hamilton Inlet District—Continued.


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p. 2375

Provisional List of Plants Found in Lake Melville and Hamilton Inlet District—Continued


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Water-loving Plants.
It is well known that certain plants, such as spanish moss, bougainvillea, the orange, or the palm are dependable exponents of the climatic conditions where they are found. It is perhaps not so well known that certain plants afford equally infallible evidence regarding the salinity of the waters in or near which they grow. Everyone knows that cat-tails flourish only in fresh water, and anyone familiar with the tropical seashore is aware that the mangrove tree can grow only where its roots reach sea-water. A host of plants show a love for, or antipathy to, a salt water habitat quite comparable with that exhibited by the mangrove of the tropics.
It is proposed in this section to consider the Hamilton Inlet and Lake Melville plants from this point of view of indices of the salinity of the water of the region. Harold St. John, describing the plants of the north shore of the gulf of St.. Lawrence, states that “ within reach of the influence of salt water, whether the shore be marshy, sandy, or rocky, is a characteristic assemblage of plants commonly known as halophytes because they grow where salt water is the governing factor. On a stretch of coast of this length a certain number of these plants are as certain to be present throughout its extent as is salt water itself.”1 St. John recognizes on the coast studied by him 66 true halophytes.
A complete list of the known shore-plants of this region, which includes.>

1“ A Botanical exploration of the North Shore of the Gulf of St. Lawrence Including an Annotated List of the Species of Vascular Plants,” Geol. surv., Can., Mem. 126, 1922, p. 11.

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the halophytes, follows. The list includes only those plants of Lake Melville and Hamilton Inlet region which are believed to be adjusted to a coastwise, lakeshore, or river habitat.
The list, it will be noted, includes a few species like Juncus balticus Wind. var. littoralis Engelm and Poa eminens L., which seem to be equally well adapted to fresh or saline water habitats. Others are confined strictly to a freshwater habitat. Several species are associated with slightly brackish water conditions.
But the species of chief interest in this connexion are those confined to parts of the shoreline where the water is strongly saline or typical sea-water. The species adjusted to this kind of habitat include such plants as Iris setiosa var. canadensis, Polygonum viviparum L., and Ranunculus lapponicus. These species do not extend west of The Narrows. The list includes seven such species which do not appear to extend their range west of the head of The Narrows. The inability of these salt-loving plants to extend their range west of the head of the Narrows affords very clear botanical evidence of the change that takes place in the salinity of the water west of The Narrows.
There is, probably, no better criterion for recognizing the points on the shore where the marine waters merge into the brackish waters of lake Melville than the distribution of the marine alga, Fucus cf. evanescens. This plant, which covers much of the surface of the inter-tidal zone about Rigolet and eastward, as well as the large kelp, disappears from the shore west of The Narrows.
The following list includes only those plants found growing on or near the shores of Hamilton inlet or its islands and The Narrows connecting lake Melville with this inlet, together with those found on the margins of the lake itself or its tributaries. The indication marks are used as follows : litt. for littoral or marine shore plants ; fr. for plants growing on the banks of freshwater bodies ; and br. for those of brackish bodies of water, as lake Melville, The Backway, or Double Mer. Combinations of these will be self-explanatory, meaning that the plant is found in both areas mentioned.

List of Plants with a Salt, Freshwater, or Brackish Habitat.1
1This list has been prepared by R. H. Wetmore, the author's assistant.
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