140 SIXTEENTH REPORT. 



Pinus sylvestris L. Scotch Pine. — Frequently planted but not spreading. 



Pinus resinosa, Ait. Red Pine. Norway Pine. — Abundant at Port 

 Franks on sand ridges, probably reaching here its southern limit. Not 

 noticed elsewhere in county. 



Larix laricina (Du Roi) Koch. American Larch. Tamarack. — Formerly 

 ver}' abundant in what was popularly called tamarack swamps. Now be- 

 coming scarce from cutting, drainage and fires. 



Picea canadensis (Mill.) B. S. P. White Spruce. — Often planted but not 

 spreading. Growing wild near Southampton, Bruce Co. 



Picea mariana (Mull.) B. S. P. Black spruce. — Occa-sionallj^ planted as an 

 ornamental tree, but not spreading. 



Picea abies (L.) Karst. Norway Spruce. — Planted in yards and cemeter- 

 ies, but not spreading. Occasionally planted as a highway ornamental tree. 



Abies balsamea (L.)' Mill. Balsam Fir. — Occasionally planted Imt not 

 spreading. 



Tsuga canadensis (L.) Carr. Hemlock.— Occasionally noticed not far from 

 the Lake Huron shore. More frequent near Port Franks. 



Thuja occidentalis L. Arbor Vitae. White Cedar — Occasional in 

 swampy places not far from the Lake Huron shore. Forming small cedar 

 swamps near Port Franks. 



Juniperus cummunis L. Common Juniper. — Occasional in dry woods, 

 especially at and near Port Franks, and in woods near the lake shore. Per- 

 haps doubtful. 



Juniperus communis depressa Pursh. Low Juniper. — Abundant on the 

 sand dunes at Port Franks acting as a sand binder. 



Juniperus viriniana L. Red Cedar. — Frequent at Port Franks on and near 

 the sand dunes. Not noticed elsewhere. 



Typhaceae. Cat-tail Famih'. 



Typha latifolia L. Common Cat-tail. — Very common in wet and boggy 

 ground. 



Typha angustifolia L. Narrow-leaved Cat-tail. — Occasional in wet and 

 boggy ground and often growing with the preceding species. 



Sparganiaceae. Bur-reed Family. 



Sparganium eurycarpum Engelm. Broad-fruited Bur-reed. — Very common 

 on l^orders of ponds, lakes, slow streams, and in wet places. 



Sparganium americanum androcladum (Engelm.) Fernald and Fames. 

 Branching Bur-reed. — Frequent in wet and boggy places. 



Sparganium simplex Huds. Simple-stemmed Bur-reed. — Occasional in 

 very wet and boggy places. 



Najadaceae. Pondweed Family. 



Potamogeton natans L. Common Floating Pondweed. — Abundant in Sar- 

 nia Bay and in still water near Lake St. Clair. 



Potamogeton epihydrus Raf. Nuttall's Pondweed. — Frequent in Sarnia 

 Bay and along the mouths of St. Clair River.' 



Potamogeton alpinus Balbis. Northern Pondweed. — Frequent in water 

 at the mouths of St. Clair river. 



Potamogeton americanus C. and S. Long-leaved Pondweed. — Common 

 in water at the mouths of St. Clair River. 



