transect (transectus, cut through), a cross section of vegetation.
trechometer (τρέχω, to run off), an instrument for measuring run-off.
tribi´um (τρίβω, wear or rub away), a succession in an eroded soil.
umbrinus, umber.
variable, able to produce variants; variant, a form arising from origin by variation; variation, the origin of new forms by the action of selection upon minute differences.
vegetation form, a characteristic plant form, e. g., tree, rosette, etc.
vernal, pertaining to spring.
vicine (vicinus, neighboring), invading from adjacent formations.
viridis, green.
vixgregarious, arranged in small or indistinct groups.