GLOSSARY 317 



ecbaUi'um, (iK(3d\X(o, cut down forests), a succe-sion due to lumbering. 



echard (ex"*. to withhold), the non-available water of the soil. 



edobole (oKos, swelling), a plant whose seeds are scattered by propulsion 

 through turgescence. 



efficient difference, the amount of a physical factor necessary to produce a 

 change in the response. 



enauli'um (li/avXos, hollow channel), a sanddiaw formation; enaulad, a sand- 

 draw plant. 



ende'mic {iv, within Brjij.o<:, district), occurring in a single formation, or natural 

 region; ende'mism, the condition of growing in but one natural area. 



epistrophe (iiri, towards, a-rpoffir], a turning), the arrangement of the row of 

 chloroplasts at right angles to the incident light. 



eremi'um (IpT^/Aos, desert), a desert formation; eremad, a desert plant. 



estival, pertaining to summer. 



=etum (locative suiifix), sufifix used to denote a consocies. 



eugeogenous (ev-, well, yrj, soil), weathering readily to form soil. 



facies, a dominant species of a formation: a distinct area controlled by it is a 



consocies. 

 family, a group of individuals belonging to one species. 

 fixity, the condition characterized by little or no response to stimuli. 

 fiavovirens, yellow green. 

 forewold, equivalent to the German "vorwald," the thicket zone bordering a 



forest. 



-genous (yeVo), to produce), producing, 



geotome (yrj, earth, rofiyj, edge), an instrument for obtaining soil samples. 

 gloeospare (yXoios, sticky stuff), a plant with viscid disseminules. 

 -graph {ypa^trj, a writing), combining term for a recording instrument. 

 gregarious {gregarius, grouped in herds), used of species in which the indi- 

 viduals occur in groups. 



habitat, a definite physical area characterized by a formation; habitat form, 

 the impress given the plant by the habitat. 



harmosis (a/a/too-ts, an adapting), response to stimuli, comprising both adjust- 

 ment and adaptation. 



hedi'um (JSo;, a sitting, base), a succession in a residuary soil. 



heliad (i^Xtos, sun), a heliophyte; heliophyll, the leaf of a sun plant; helio- 

 phyte, a sun plant; heliophyti'um, a sun plant formation; heliophilous, 

 sun-loving-. 



