FLORA OF MICHIGAN. 165 



1657. P. Baiiksiaiia, Lambert. Gray or Northern Scrub Pine. Jack Pine. 



In the western part of the State, noticed as far south as Grand Haven. Occurs at south end of Lake 

 Michigan in Indiana; "Sand Pt., Saginaw Bay, and northward along the shore of L. Huron, not common," 

 Winch. Cat. In the central part of the State this pine is first seen in the northern part of Clare Co., 

 where it is common in groves on sandy barrens. Trees sometimes grow 50 to 70 feet in height and rarely 

 have been measured with a diameter of two feet. 



1658. P. resiiiosa, Ait. Red Pine. Norway Pine. 



Dry woods. First noticed in Isabella Co., in center of the L. P. ; very abundant in Clare Co., and 

 northward. " Frequent on low, sandy plains in U. P., where it forms orchard-like groves," Whitney. 

 Usually 100-110 feet high. On the east side of the State extends southward to Port Huron, C. K. Dodge. 



527. PICE A, Link. SPRUCE. 



*1659. P. nig-ra, Link. Black Spruce. Th. 



Frequent northward, and occasional south, a small tree in sphagnous swamps. The following species 

 is more common northward. 



1660. P. alba, Link. White Spruce. N. & U. P. 



From Ludington to Alcona Co., Dr. Beal ; Petoskey and northward. Common. 



528. TSUGA, Carriere. HEMLOCK. 



* 1661. T, Canacleiisis, Carriere. Th. except S. E. 



Grand Ledge. Rarely seen south of latitude 43 except west, and scarce on the Huron shore, but com- 

 mon on the east shore of L. Michigan, and from the central part of the State northward. Very abundant 

 and of great size in Emmett Co. Bark an article of commerce, used for tanning. 



529. ABIES, Link. FIR. 

 1662. A. balsamea, Miller. Balsam or Balm-of-Gilead Fir. N. C. & U. P. 



Frequent in the northern part of Clare Co.; abundant at Petoskey, and northward. 

 53O. LAKIX, Tourn. LARCH. 



*1663. L. Americana, Michx. American or Black Larch. Tamarack. 

 Hackmatack. Th. 



Swamps. A slender tree southward, but sometimes reaching 100 feet in height northward, where 

 t is abundant. 



531. THUYA, Tourn. ARBOR VITJE. 

 1664. T. occirteiitalis, L. Arbor Vitas. White Cedar. v Th. 



Very common northward. Timber very durable, much used for fence posts, etc. 



532. JUXIPERUS, L. JUNIPER. 



* 1665. J". comnumis, L. Common Juniper. Th. 



Occasional throughout, along the highest grounds. 



1666. J. Safoiiia, L., var. procumbeus, Pursh. N. & U. P. 



Abundant, trailing over low sand dunes at the head of Little Traverse Bay: Old Mission, W. J. Beal, 

 and northward. 



* 1667. J. Virginiana, L. Red Cedar. Savin. Th. 



Bluffs and sterile soil. Throughout, but scarce. 



533. TAXUS, Tourn. YEW. 



*1668. T. Caiiacleiisis, Willd. American Yew. Ground Hemlock. 



Moist woods in the shade of evergreens. Along the east shore of Lake Michigan as far south as S. 

 Haven, Bailey; Macomb Co., where it is rarely found. Common northward. 



CX. EQUISETACE^E. HORSETAIL FAMILY. 



534. EQUISETUM, L. HORSETAIL. SCOURING RUSH. 



*1669. E. arvense, L. Common Horsetail. Th. 



Damp, sandy grounds. Common. 



1670. var. campestre, Milde. 



Keweenaw Co., F. 



