Transactions of the Wagner Free Institute of Science of Philadelphia . nt of the vegetation is appropriate. The trees of the Snake Hills areJuglans cinerea, Betula lutea, Quercus Prinus (abundant), Celtis occidentalisin rocky areas, Sassafras variifolium, Hamamelis virginiana, LiquidambarStyraciflua, Acer saccharum, Comus paniculata. Viburnum pubescens, while thelate blueberry, Vaccinium vacillans, forms the common undergrowth layer onthese rocky hills. The herbaceous plants of such rocky hills are given in thehst of plants collected by Vincent G. Burns and need not be mentioned here. THE FLOR
Transactions of the Wagner Free Institute of Science of Philadelphia . nt of the vegetation is appropriate. The trees of the Snake Hills areJuglans cinerea, Betula lutea, Quercus Prinus (abundant), Celtis occidentalisin rocky areas, Sassafras variifolium, Hamamelis virginiana, LiquidambarStyraciflua, Acer saccharum, Comus paniculata. Viburnum pubescens, while thelate blueberry, Vaccinium vacillans, forms the common undergrowth layer onthese rocky hills. The herbaceous plants of such rocky hills are given in thehst of plants collected by Vincent G. Burns and need not be mentioned here. THE FLORA (V. G. B.) In view of the fact that the difference between low and high tide levelsin the Hackensack River is only 2 or 3 feet, and as one goes up the river thewater becomes less salt, it would be expected that the flora would changefrom a typical salt marsh near Newark Bay, at the river mouth, to a brackishflora in the center of the valley, and finally to a fresh-water flora in the north-ern part. Also it would be expected that, as one went back from the river on. Fig. 8. A stagnant pool covered with Duckweed, Lemiia minor, and surrounded with Cattails, Typha, near the Belleville Turnpike, August i8, 1916. V. G. B.
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