Rexford Daubenmire's Habitat Type Classification.
Illustrations from Pfister, R.D., Kovalchik, B.L., Arno, S.F. and Presby, R.C. 1977. Forest habitat types of Montana.USDA Forest Service General Technical Report INT-34. 174 pp.
Habitat Type (homoece, equivalent environment): All the area that now supports, or within recent time has supported, and presumably is still capable of supporting, one plant association.
Association: a plant community of definite composition, presenting a uniform physiognomy.
Physiogonomy: the general appearance of vegetation including density, height, leafiness and woodiness.
Distributions of individual taxa
Productivity (ft3/yr)
Data: frequency, coverage, constancy ...