''Tristaniopsis collina'', known as hill water gum or hill kanuka, is a tree of eastern Australia. The natural range of ''T. collina'' is from near Mount Gulaga (36° S) in the south of

New South Wales ) , nickname = , image_map = New South Wales in Australia.svg , map_caption = Location of New South Wales in AustraliaCoordinates: , subdivision_type = Country , subdivision_name = Australia , established_title = Before federation , es ...

to the border with the state of

Queensland ) , nickname = Sunshine State , image_map = Queensland in Australia.svg , map_caption = Location of Queensland in Australia , subdivision_type = Country , subdivision_name = Australia , established_title = Before federation , establishe ...

at the

McPherson Range The McPherson Range is an extensive mountain range, a spur of the Great Dividing Range, heading in an easterly direction from near Wallangarra to the Pacific Ocean coastline. It forms part of the Scenic Rim on the border between the states of N ...

(28° S). The usual habitat is rainforest away from streams on shallow soils at high altitude. However, it can occasionally be seen at low altitudes such as at Seal Rocks and

Chatswood West Chatswood West is a suburb on the Lower North Shore of Sydney, in the state of New South Wales, Australia. Chatswood West is located 11 kilometres north-west of the Sydney central business district, in the local government areas of the Ci ...

. ''T. collina'' is remarkably similar to the related '' T. laurina'' (Water Gum), but the latter species is strictly

riparian A riparian zone or riparian area is the interface between land and a river or stream. Riparian is also the proper nomenclature for one of the terrestrial biomes of the Earth. Plant habitats and communities along the river margins and banks a ...

Description

''Tristaniopsis collina'' is a small to medium tree, up to in height and up to in trunk diameter. The trunk is irregular, not cylindrical. The bark is grey or creamy, very thin, with papery fibres that come off to touch. Branchlets are coloured purple and angular in cross section. The alternate simple leaves are around long, with a long thin tip, and numerous oil dots of varying sizes. The midrib is sunken on the top surface, but raised below. Yellow

flower A flower, sometimes known as a bloom or blossom, is the reproductive structure found in flowering plants (plants of the division Angiospermae). The biological function of a flower is to facilitate reproduction, usually by providing a mechani ...

s form in cymes from November to January. The

fruit In botany, a fruit is the seed-bearing structure in flowering plants that is formed from the ovary after flowering. Fruits are the means by which flowering plants (also known as angiosperms) disseminate their seeds. Edible fruits in particu ...

is a dry capsule maturing from April to July. The fruit is practically identical to that of ''T. laurina''. The winged

seed A seed is an embryonic plant enclosed in a protective outer covering, along with a food reserve. The formation of the seed is a part of the process of reproduction in seed plants, the spermatophytes, including the gymnosperm and angiospe ...

s are long and broad.

References

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(Publication details included in citation)
{{Taxonbar, from=Q7844159 collina Myrtales of Australia Trees of Australia Flora of New South Wales Flora of Queensland