the larvae of the longicorn beetle in dying or dead wood, 

 cf. Habitat, Niche. 



Heat Budget 



The amount of heat expressed in gram calories that is 

 necessary to raise the temperature of a body of water from 

 the winter to summer temperatures. 



Heath 



A community usually occurring in cool climates, often 

 dry, usually without trees and uncultivated, characterized by 

 low shrubby plants mostly in the family Ericaceae, cf. Moor, 

 Bog, Marsh, Swamp. 



Heaving 



The partial raising of plants out of the ground resulting 

 from the freezing and thawing of the soil during the winter, 

 often breaking the roots. 



Hedgerow 



A strip of shrubs or small trees, often planted, enclosing 

 a field or other area. 



Heel-in 



Placing young plants such as fruit trees in a temporary 

 trench with soil over the roots to protect them from drying 

 until they are permanently planted. 



Hekistotherm 



A plant growing in a cold region, which requires less 

 heat than other kinds of plants, growing where the average 

 temperature for the warmest month of the year is less than 

 50 F., e.g., mosses, lichens, sedges, etc., in the Arctic, cf. 

 Megatherm, Mesotherm, Microtherm. 



Heliophyllous 



Refers to organisms that grow best in full sunlight. 



Heliophyte 



A Heliophyllous organism. 



168 



