Pinus 



PlNACEAE 



67 



~~ 30 



Map 59 



Taxus canadensis Marsh. 



o ^^3 

 Map 6 



Pinus Banksiana Lamb. 



22. PINUS [Tourn.] L. Pine 



Leaves 5 (rarely more) in a bundle, 6-12 cm long 1. P. Strobus. 



Leaves 2 or 3 in a bundle. 



Scales of cones unarmed; leaves in 2's, 2-5 cm long 2. P. Banksiana. 



Scales of cones tipped with a short spine; leaves 2 or 3 in a bundle. 



Spine of cone-scale 2-3 mm long, curved ; leaves twisted, 4-8 cm long 



3. P. virginiana. 



Spine of cone-scale about 1 mm long; leaves straight, 7-13 cm long. (See ex- 

 cluded species no. 20, p. 1022.) P. echinata. 



1. Pinus Strobus L. Northern White Pine. Map 60. This species 

 is local and is usually found in limited numbers, except along Bear Creek, 

 Fountain County and Big Pine Creek in Warren County where there were 

 formerly many acres of it. In the dune area it was scattered in its dis- 

 tribution with a large colony here and there. There formerly were several 

 acres of it in a bog east of Merrillville, Lake County, but it has now nearly 

 disappeared. 



In our area its favored habitat was wet woods or boggy places, on the 

 dunes along Lake Michigan, on cliffs and high banks along Bear Creek, 

 Fountain County, and in a like habitat including adjacent lowland in 

 Warren County along Big Pine and Kickapoo Creeks. 



Newf. to Man., southw. in the mts. to n. Ga., Tenn., and Iowa. 



2. Pinus Banksiana Lamb. Jack Pine. Map 61. This pine is found 

 only on the dunes near Lake Michigan. I can recall when it was common 

 on the low dunes in Lake County but it has now nearly disappeared on 

 account of advancing civilization. 



N. S. to n. N. Y., n. Ind. to Minn., northw. 



3. Pinus virginiana Mill. VIRGINIA Pine. Map 62. This species is re- 

 stricted to the crests of some of the ridges of knobstone in three counties. 

 On some of the ridges it formed dense stands, but, on the whole, the species 

 is not a strong competitor of the other species. It, however, promptly 

 invades abandoned fields within and adjacent to the area of its natural 



