40 
TENTH REPORT. 
five miles east of Ingall’s Station on the C. and N. W. R. R,, T. 34 N., R 
26 W., the plant was always found growing in water from one to two feet 
deep, but Torrey and Gray, Flora of North America Vol. I p. 20, describe 
R. limosus, Nutt, as “sub-aquatic,” and this species has been identified, 
rather carelessly, it seems to me, with Richardson’s R. Purshii. 
Ann Arbor, Mich. 
A BOTANICAL TRIP TO THUNDER BAY ISLAND. 
C. K. Dodge. 
Thunder Bay Island is in Lake Huron about twelve miles east of the 
city of Alpena, Alpena Co., Mich., and four miles east of North Point, the 
nearest mainland. It contains about 145 acres. On the east side is the 
light house, on the west side, the United States Life Saving Station, at present 
managed by Captain John D. Persons, a genial and intelligent man, who 
welcomes geologists, botanists, and all scientists. The island is a solid lime- 
stone rock, just above the water, built up ages ago. The soil covering 
is generally very light, and in many places a considerable distance away 
from the shore the rock is exposed. In the center, the drift may be several 
feet thick. The island is occupied only by light house and life saving em- 
ployes and their chiefs. Very little attempt is made at cultivation of the 
soil, even for gardening. Near by at the north west is another rock rising 
above the water, and covered with drift, called Sugar Island, and another 
one called Gull Island not occupied at present, both showing some signs of 
former habitation, probably by fishermen and being well covered by vege- 
tation. North Point is a projection of drift-covered limerock from the 
mainland to the south, partially dividing off from the Lake the body of 
water called Thunder Bay. 
Thunder Bay Island is a veritable emerald gem out in the sea and should 
have had a name corresponding to its beauty. It was visited June 22, 23 
and 24, 1907, mainly to rediscover and secure specimens of a dark-fruited 
thorn, at present known as Crataegus borealis Ashe, reported as found there 
by Prof. C. A. Wheeler over ten years ago. After a thorough search not a 
thorn of any species could be found on that island. But on Sugar Island 
fine specimens of Crataegus punctata Jacq. were noticed in abundance, 
not yet in bloom, nor did they bloom till the first week in July. Failing to 
find the main object of the search, attention was turned to other plants. 
The principal tree of Thunder Bay Island is Abies balsamea (L.) Mill, of 
small size growing thick especially on the western half. In a few places 
Thuja occidentalis L., Larix laricina (DuRoi) Koch., and a very few of 
Fraxinus pennsylvanica Marsh, were noticed. Among these also were 
many small shrubs of Acer spicatum Lam., being of larger size and very 
abundant on Sugar Island. One fine speciman of Sorbus americana Marsh, 
was noticed. In many places Alnus incana (L.) Willd. was abundant. Not 
an oak, beech, hickory or elm was seen. Salix glaucophylla Bebb occurs 
at the north end. Juniperus sabina L., bearing fruit in abundance, covered 
the ground in many places, having the appearance at first of a Lycopodium 
and at North Point on sandy ridges it was abundant. At the south end 
Malus malus (L.) Britton was frequent, low and scraggy, and in full bloom 
