THE BOGS AND BOG FLORA OF THE HURON RIVER 
VALLEY 
EDGAR NELSON TRANSEAU. 
(WITH SIXTEEN FIGURES) 
I. The Huron River valley. 
PHYSIOGRAPHIC FEATURES, 
Tar Huron River valley, to the botanical survey of which the 
present paper forms the sixth contribution, is located in the south- 
eastern part of Michigan. As indicated in fig. 1, the valley embraces 
parts of five counties. 
Throughout, its surface forms are of glacial origin and, with the 
exception of the immediate borders of the river, have undergone but - 
slight modification since glacial times. Perhaps its most striking. 
lopographic features are the rough morainic hills of its upper and 
middle courses, and the gently undulating plain of its lower course. 
The river has its source in west-central Oakland County in Big 
Lake, 9 miles (14. 5*™) southeast of Holly and approximately 40 miles 
(64*") northwest of Detroit. Starting with an elevation of 950 
feet (290™), after a course, extending for 50 miles (80*™) generally 
Southwestward and then for another so miles (80™) southeastward, 
It empties into Lake Erie at an altitude of 573 feet (175™) above tide. 
‘s common in areas of glacial deposition, the topography of the 
drainage basin of the Huron has little of the appearance usually 
uggested by the term “valley.” The upper two-thirds of its course 
a winding depression among morainic knobs, lake basins, abandoned 
slacial drainage channels, and sand plains. Here the river is char- 
pa by long reaches and occasional slight riffles. At intervals 
s .. Into stretches of lake-like character, as is illustrated by 
uae es of water as Commerce, Taylor, Strawberry, Whitewood, 
mile ee Lakes, each with an area of one-fourth to one-half a square 
i ag hectares). The river margin is usually low and shied ba . 
of Sa. Utaries enter it at every angle, and bring to it the drainage 
es teds of lakes and swamps. Most of these lakes are small, - 
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