6. DESCRIPTION AND MAP (PLATES XXI AND XXII) OF BELT 
TRANSECT OF THE MARSH (FROM 1.5 TO 10 FEET), 
SHOWING THE DISTRIBUTION OF THE VEGE- 
TATION EXISTING IN 1909-1910. 
By Henry S. CONARD, AIDED BY PAUL M. CoLLINS AND CHARLES W. PALMER. 
We will give at the start a brief explanation of the construction of the map, 
plates xxr and xx11. Then, after noting the topography of the area studied, 
will take up the zonation of its vegetation in detail. 
1, EXPLANATION OF PLATES XXI AND XXII. 
This map represents a minute study of a portion of the Marsh at the head of 
the Inner Harbor, by means of a belt transect (Clements, 1905, pp. 178-179). 
The belt is 50 feet wide and extends from the wagon-road on the south to the 
open water of the harbor on the north. It lies on the general map between 1,050 
east and 1,100 east, and 525 south and 100 north. This belt was chosen because 
it represents the greatest diversity of vegetation, together with the most distinct 
zonation. Stakes were set every 50 feet along each side. Then with tape-lines 
and graduated rods the exact boundaries of the vegetative areas were plotted in 
strips 5 feet wide. Every plant was located when isolated or not forming a 
prominent part of a society. For example, every individual plant is given for 
the following species: Asclepias incarnata, Atriplex arenaria, Hibiscus mos- 
cheutos, Hypericum perforatum, Iva oraria, Myrica gale, Oenothera biennis, 
Prunus serotina, Rubus alleghemensis, Rumex crispus, Sambucus canadensis, 
Vaccinium pennsylvanicum. 
Several other species are located where they occur sparsely, or on the margins 
of their areas, but are put in diagrammatically where plentiful. This serves 
to show the limits of distribution and the areas of dominance. Such species are: 
Aspidium thelypterts, Atriplex patula hastata, Distichlis spicata, Juncus 
gerardi, Salicornia europea, Scirpus americanus, Solidago sempervirens, Spar- 
tina glabra alterniflora, S. patens, Sueda maritima. 
Carex tenera, Eleocharis olivacea, and Limonium carolinianum are marked 
where sparse, but are not designated on the map where more plentiful. They 
are mentioned in the description of the various belts. 
In every case the mark on the map is much larger in proportion than is the 
plant itself. This is a mechanical necessity. Hence also many small gregarious 
species must be diagrammatically shown. Gregarious species which do not 
become dominant are: Aster nove-belqu, A. subulatus, Atriplex patula hastata 
(in favorable places), Distichlis spicata, Gerardia marituma, Impatiens biflora, 
Juncus gerard: (when outlying), Lileopsis lineata, Lysvmachia terrestris (in 
favorable places), Plantago decipiens, Polygonum maritimum, Salicornia 
europea (in places), Scirpus nanus, Spergularia marina, Triglochin maritima. 
Diagrammatic representation was alone possible for many plants which occur 
scattered more or less profusely throughout a community. Such are: Aster 
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