STATE GEOLOGIST. 



297 



White, or Single 

 Bpruco. 



Larch, Tama- 

 £rack, H^ickmu- 

 fcaok. 



Arbor Vitas, 

 Wbilo Codar. 



Abies alba, Michx. 



Drummond's I., common; Sugar and St. Joseph's Is.; ShoroofL. Mich., 

 rare. The black spruco is moro widely diffused over thoStato than 

 the white, but tho whits predominates in the northern districts. 



Larix Americana, Miclix. (Pinus pendula — W.) 



Ann Arbor; False Prcsqu' Islo, L. Hujron; Drumraond's I.; Sugar L, 

 abundant and very Urge, rising to tho night of 100 feet or more, 

 with a circumFerouco of six and a half feet, two feot above tho 

 ground. Swampy lands at the head of Branch Lake, Antrim Co., 

 very large. This is a common tree in low, marshy land, and often, 

 mingles with the white cedar in the well known " codar swamps." 



Thuja occidentalis, L. 



The most striking and hardy tree of tho forest, growing in all situa- 

 tions, with its roots immersed in water, and on tho most barren 

 and inaccessible heights. In low and level tracts it often forms 

 extensive lt cedar swamps." It may always bo seen about tho 

 shore of an inland lake or the margin of a river, its dense foliago or 

 dry scraggy limbs projecting over the water. It is generally a 

 tree about 25 ft. in height, hut sometimes grows to a mon- 

 strous size on high lands where there is soil sufficient to sustain it. 

 The largest specimens seen were growing in the sandy soil of Era- 

 met Co., in higher situations than is usual for the tree. One speci- 

 men among "others scattered through the forest composed mostly 

 of beeches and hemlocks, had a diameter of 4 ft 2 in. four feet from 

 the ground. It is of slow growth, and requires centuries to attain 

 such dimensions. Its wood has the greatest durability and is much 

 used for fenco posts, while its bark furnishes thatching for the 

 wigwam of the Indian and the cabin of the settler; S. Michigan. 

 (Wright). On Drummond's Island were seen willows 25 to 30 

 years old v growing above the prostrate trunks of tho whitJ cedar, 

 still remaining in a perfect state of preservation. In other cases it 

 is equally sound beneath pnat bngs, or buried 30 feet under " modi- 

 fied drift," whore it must have lain for ages. 



Juniperus communis, L 



Ann Arbor; Ft. aux Barques, L. Huron; False Presqu' Isle, L.Huron; 

 Old Ft. Mackinac, Emmet Co. Common about the lake shores. 



Juniperus Virghiiana, L. 



Ann Arbor; Thunder Bay Is.; N. W. (Univ. Herb); S. Mich. (Wriglit). 



var. humilis, Hook. 



False Presqu' Islo, with trailing stems 25 ft. long; Sand dunes, Emmet 

 Co., abundant. 



American Yew Taxus baccata, L. var. Canadensis, Gray. 



GroundHem- Middle I., L. Huron, very abundant; Drummond's I., common; L.Mich. 



lo8 ^* Common throughout the northern counties, especially in the shade 



of evergreens, a declining, one-sided shrub, having a luxuriant 

 dark-green foliago and presenting a beautiful appearance where it 

 covers the surface, but vieing with tho "White Cedar in forming a 

 most persistent obstruction to the progress of the pedestrian. 



AEACE^J. 



Arissema triphyllum, Ton*. (Arumtriphyllum—W.) 



Ann Arbor; Ft. Gratiot; Northport. 



Arissema Dracontium, Sch:,tt. 



Ann Arbor. 



Peltandra Vivginica, Raf. (Eensselaeria Vivginica 

 — W.) 



S. Mich. (Wright). 



Calla palustris, L. 



Ann Arbor ; S. W. (Wright). 



Juniper. 



Rod Codar, 

 Bavin. 



Indian Tarntp. 



Groon Dragon, 

 Dragon-root. 



Arrow Arnm. 



Wafcor Aram. 



38 



