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galea

Helmet- or hood-shaped.

The hood shaped trowel leaved orchid. Photographer: Tony Foster
The hood shaped trowel leaved orchid. Photographer: Tony Foster

galeate

Shaped like a helmet or hood.

gametophyte

A plant that produces sperm and egg cells and in which sexual reproduction takes place - in ferns this is known as the prothallus.

Gametophytes of the fern Blechnum procerum. Photographer: Jeremy Rolfe

gene pool

The mixture of all genes and gene variations of a group or population.

genetic diversity

The variety of genes in a plants or populations.

genetic variation

Differences displayed by individuals within a plant which may be favoured or eliminated by selection.

genus

A taxonomic rank of closely related forms that is further subdivided in to species (plural = genera). In a scientific name (e.g., Sicyos australis), the first word is the genus, the second the species.

gibbous

Swollen or enlarged on one side, as in a gibbous moon.

glabrescent

Lacking hair or a similar growth or tending to become hairless.

glabrous

Without or devoid of hairs, smooth.

The glabrous leaves of Poulzolzia australis. Photographer: Tony Foster

gland

A structure that secretes a sticky or oily substance.

Glands on the leaf of Drosera auriculata. Photographer: Jeremy Rolfe

glandular

A structure that secretes a sticky or oily substance.

Glandular hairs of Drosera pelota. Photographer: Tony Foster
Glandular hairs of Drosera pelota. Photographer: Tony Foster
Glands on Metrosideros perforata. Photographer: Tony Foster

glaucous

Covered with a fine, waxy, removable powder that imparts a white or bluish cast to the surface.

Bluish foliage of Dawsonia superb. Photographer: Tony Foster

gley

A soil prone to seasonal inundation.

globose

Globe-shaped.

Globe-shaped fruit of Coprosma rhamnoides. Photographer: Tony Foster

glume

One of two bracts at the base of a grass spikelet.

Glumes of Carex secta. Photographer: Tony Foster
Glumes of Uncinia uncinata. Photographer: Jeremy Rolfe

groundwater

Groundwater is the water beneath the surface that can be collected with wells, tunnels, or drainage galleries, or that flows naturally to the earth’s surface via seeps or springs. Groundwater is the water that is pumped by wells and flows out through springs.

gynodioecious

A species population containing plants that produce bisexual (perfect) flowers, and plants that produce only female (pistillate) flowers.

gynoecium

The female reproductive organs of a flower; the pistil or pistils considered as a group. Means literally “womans house” i.e., the overall structure that contains the female sex organs.

gymnosperm

Plants in the class Gymnospermae that have seeds which are not enclosed in an ovary.

Fruit of Podocarpus totara, a gymnosperm. Photographer: Jeremy Rolfe

geniculate

Abrubtly bent.

The geniculate petiole of Entelea arborescens. Photographer: Tony Foster
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