-genous (γένω, to produce), producing.
geotome (γῆ, earth, τομή, edge), an instrument for obtaining soil samples.
gloeospore (γλοιός, sticky stuff), a plant with viscid disseminules.
-graph (γραφή, a writing), combining term for a recording instrument.
gregarious (gregarius, grouped in herds), used of species in which the individuals occur in groups.
habitat, a definite physical area characterized by a formation; habitat form, the impress given the plant by the habitat.
harmosis (ἅρμοσις, an adapting), response to stimuli, comprising both adjustment and adaptation.
hedi´um (ἕδος, a sitting, base), a succession in a residuary soil.
heliad (ἥλιος, sun), a heliophyte; heliophyll, the leaf of a sun plant; heliophyte, a sun plant; heliophyti´um, a sun plant formation; heliophilous, sun-loving.
heli´um (ἕλος, marsh), a marsh formation; helad, a marsh plant; helodi´um (ἑλώδης, marshy), a swampy open woodland formation; helodad, a marsh plant; helodrium (δρίος, thicket), a thicket formation; helodrad, a plant of a marshy thicket; helohyli´um (ὕλη, forest) a marsh forest formation; helohylad, a marsh forest plant.