Trees of New York State 399 



extend up the Champlain valley to the St. Lawrence) ; the Dela- 

 ware, Susquehanna and Allegrhany drainage valleys ; across the 

 Alleghany plateau in Finger Lake valleys ; up the Mohawk valley 

 (especially south exposures) and notably strongly developed in 

 the narrow Erie belt and the broader Ontario-Iroquois basis 

 (notable occurrence of Chestnut on sandy soilsj to the Oneida 

 Lake region; northward "thinning out" (by disappearance of 

 Chestnut. Tulip Tree, certain oaks and hickories and most of the 

 secondary Austral woody species) toward the St. Lawrence valley. 



Low elevations to more or less 1200 feet southward and in terri- 

 tory under maritime and especially lake influence. 



Growing season 160 to 180 days (Lower Hudson region; Erie 

 and Ontario basins). "Thinned out" at low elevations of 150 

 days growing season. (Apparent exception in case of Delaware, 

 Susquehanna and Alleghany valleys?) 



C. Dominance of Sugar Maple, Beech, Yellow Birch, Hemlock and White Pine 

 Mixed Forest, Alleghany-Transition Forest Zone: 



Indicator Species: 



White Pine Pinus Strobus L. 



Hemlock Tsuga canadensis (L.) Carr. 



Black Willow Salix nigra Marsh. 



Peach-leaved Willow Salix amygdaloides Anders. 



Hop Hornbeam Ostrya virginiana (Mill.) K. KoA. 



Yell«v7 Birch Carpinus caroliniana AValt. 



Blue Beech. Water Beech.. Betula lutea Miehx. f. 



Gray Birch. Old Field Birch. Betula populifolia Marsh. 



Beech Fagus grandifolia Ehrh. 



Juneberry Amelanchier canadensis (L.) Medic. 



Thorn-apple. Hawthorn .... Crataegus pedicellata Sarg. 



Choke Cherrv- Prunus Tirgianiana L. 



Sugar Maple Acer saccharum Marsh. 



Red Maple Acer rubrum L. Notably in swamps. 



Striped Maple Acer Pennsylvanicum L. Zone D? 



Mountain Maple Acer spicatum Lam. Zone D? 



Basswood Tilia americana L. 



White Ash Fraxinus americana L. 



Distribution of C in Xe\v York 



Tendency to recurrence upon every favorable edaphic situation 

 throughout the State up to more or less 2.000 feet (Catskills) 

 excepting, in general, the Adirondacks, but dominant over the 

 Alleghany plateau region and the Catskills below the spruce- 

 balsam zone. 



