LIGHT IN RELATION TO TREE GROWTH. 



199 



Tolerant. 

 ChairiiCcyparis lawsoniana (Port Or- 



ford cedar). 

 Libocednis decurre)is (incense cedar). 

 Picea panyana (blue spruce). 

 Sequoia sempervireits (redwood). 



Very Intolerant. 

 Larix lyallii (alpine larch). 

 Larix cccidentalis (western larch). 

 PiiiKs albicaulis (white-bark pine). 

 Finns atteiiiiata (knobcone pine). 

 Piniis balfotiriana (foxtail pine). 

 Pinus couUeri (Coulter pine). 

 Pimis Jlexilis (limber pine). 

 Pinus inonophylla (single-leaf pine). 

 Pinus edulis (pinon). 

 Pinus sahiniana (digger pine). 

 Pinus iontorla (lodgepole pine). 



Intermediate. 

 Pseudotsuga taxifolia (Douglas fir). Abies nobilis (noble fir). 



Pseudotsuga viacrocarpa (big-cone 



spruce). 

 Abies amabilis (amabilis fir). 

 Abies i'7-andis (t^rand fir). 



Chanuecypans nooikatensis (\-ellov 



cypress). 

 Sequoia -vashiiiglouiaua (biglree). 

 Piints monticola (western white pine) 



Eastern Species. 

 Very Tolerant. Intolerant. 



Chanicecyparis thvoides (southern 



white cedar ^. 

 Abies balsainea (balsam fir). 

 Abies fraseri (Fraser fir). 

 Tsuga canadensis (hemlock). 



Tolerant. 

 Picea canadensis (white spruce). 

 Picea ruben'i (red spruce). 

 Thuja occidentalis (northern white 



cedar). 

 Fagus airopunicea (beech). 

 Acer saccharum (sugar maple). 

 Acer saccharinum (silver maple). 

 Acer rubrum (red maple). 

 Nyssa sylvatica (black gum). 

 Ulinus americana (white elm). 

 Ulmus raceinosa (cork elm). 

 Tilia americana (basswood). 

 Platanus occidenhilis (sycamore). 



Pinus divaricata (jack pine). 

 Pinus resinosa (red pine). 

 Oxydendruni arboreuni (sourwood). 

 lAriodenctron tulipifera (tulip poplar). 

 Q. rubra (red oak). 

 Q. velutina (yellow oak and others). 

 Betula papyj-ifera (paper birch). 

 Liquidaiiibar styracijlua (red gum). 

 Hicoria alba (mockernut). 

 Plicoria ovala (shagbark hickory). 

 Hicoria pecan (pecan). 



Very Intolerant. 

 Pinus palustris (long-leaf pine). 

 Pinus echinata (short-leaf pine). 

 Taxodium distichum (bald cypress). 

 Larix laricina (tamarack). 

 Robinia pseudacacia (black locust or 



false acacia). 

 Salix (willows). 

 Popidus delioides (cottonwood). 

 Populus gi-andidentata (large-tooth 



aspen). 



