Question: Cyathea propinqua is a species of tree fern native to which island country in Melanesia in the South Pacific Ocean?

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Cyathea propinqua: Cyathea propinqua is a species of tree fern native to Fiji and possibly Samoa, where it grows in wet forest.  The trunk of this plant is erect and slender, growing to 10 m in height.  Fronds may be bi- or tripinnate and 2-3 m long.  Dull brown scales cover the dull, dark stipe of this species.  The scales are minute along most of its length, becoming thick and fleshy towards the base.  Sori are borne halfway between the pinnule midvein and the edge of the lobe.  Indusia are present.

Cyathea australis: Cyathea australis, also known as the Rough Tree Fern, is a species of tree fern native to southeastern Queensland, New South Wales and southern Victoria in Australia, as well as Tasmania and Norfolk Island.  It grows in moist shady forest, both coastal and montane, at an altitude of up to 1280 m, often in the company of "Dicksonia antarctica".  The massive erect trunk is usually up to 12 m tall, although specimens reaching 20 m have been reported from Queensland, Australia.  Fronds are bi- or tripinnate and may reach 4 m in length, occasionally even 6 m.  These form a distinctive crown that is dark green above and lighter green below.  The Tree Fern has quite adventitious roots, tubercles and hair-like follicles on its ‘trunk’.

Cyathea alpicola: Cyathea alpicola is a species of tree fern native to central Sumatra, where it grows in montane rain forest at an altitude of 2000-2750 m.  The erect trunk can reach 5 m or more in height.  Fronds are bi- or tripinnate and usually 2-3 m long.  They have a tendency to persist on the plant after withering, forming an irregular skirt around the trunk.  This species has a spiny stipe, which is covered with a woolly layer of scales.  There appear to be two forms with different scales; either dark glossy brown with a broad paler margin and fragile edges, or small, brown and finely fringed.  Sori are covered by thin, fragile indusia and occur near the midvein of fertile pinnules.  The closest relative of "C. alpicola" is thought to be "Cyathea polycarpa", which differs by lacking spines altogether. " Cyathea macropoda" and "Cyathea magnifolia" may also be closely allied with this species.

Cyathea baileyana: Cyathea baileyana, also known as the wig tree fern, is a species of tree fern native to northeastern Queensland in Australia, where it grows in wet gullies and forest at an altitude of 850-1200 m.  It is a rare species that is seldom found in the wild.  The erect trunk is 4-5 m tall, approximately 10 cm in diameter and may be covered in stipe bases in the upper regions.  "C. baileyana" is notable for being able to develop offshoots from the base of the trunk.  Fronds are bi- or tripinnate and may be exceptionally long, up to 7 m, though they are usually around 2-3 m.  The rachis and stipe are dark to darkish red, scaly and may be warty, but lack spines.  Scales on the rachis and stipe are purplish brown to black and have a long hair-like apex.  Characteristically of this species, the last pair of pinnae are separated from the others along the rachis and may form a clump (the "wig") around the trunk apex.  Sori are circular and occur in one to three rows along the pinnule midvein.  They lack indusia.

Cyathea fulgens: Cyathea fulgens is a species of tree fern native to Cuba, Jamaica and Hispaniola.  It forms part of the complex centered on "Cyathea woodwardioides" comprising six very similar taxa from the Greater Antilles.  The other five species are "Cyathea crassa", "Cyathea grevilleana", "Cyathea portoricensis" and "Cyathea tussacii".  Large and Braggins (2004) note that this group is known to cross with members of the "Cyathea minor" complex.  In the wild, "C. fulgens" also forms hybrids with "Cyathea brooksii".

Fiji: Fiji ( ; Fijian: Viti ] ; Fiji Hindi: फ़िजी), officially the Republic of Fiji (Fijian: Matanitu Tugalala o Viti ; Fiji Hindi: फ़िजी गणराज्य), is an island country in Melanesia in the South Pacific Ocean about 1100 nmi northeast of New Zealand's North Island.  Its closest neighbours are Vanuatu to the west, New Caledonia to the southwest, New Zealand's Kermadec Islands to the southeast, Tonga to the east, the Samoas and France's Wallis and Futuna to the northeast, and Tuvalu to the north.

Cyathea cunninghamii: Cyathea cunninghamii, also known as the gully tree fern and slender tree fern, is a species of tree fern native to Victoria, New South Wales, southeastern Queensland and Tasmania in Australia, as well as North Island, South Island and Chatham Islands in New Zealand (and possibly New Caledonia also).  It grows in damp forest, often emerging from stream gullies and riverbanks.  The erect trunk may be 20 m tall and is usually 6-15 cm in diameter, occasionally as much as 20 cm.  Fronds are tri- to tetrapinnate and 3 m or more in length.  The rachis and stipe are slender, black brown, warty and covered with brown scales. Sori occur along each side of the pinnule midvein and are covered by hood-like indusia.  "C. cunninghamii" is an uncommon and slow-growing tree fern.  Great specimens occur in Tarra-Bulga National Park, Victoria.

Cyathea colensoi: Cyathea colensoi, also known as the Creeping Tree Fern, Mountain Tree Fern and Golden Tree Fern, is a species of tree fern native to

Cyathea brownii: Cyathea brownii, commonly known as the Norfolk tree fern or smooth tree fern, is probably the largest tree fern species in the world.  It is endemic to Norfolk Island, in the Pacific Ocean near Australia and New Zealand.  It is named after the botanist Robert Brown (1773-1858).

Cyathea cooperi: Cyathea cooperi, also known as the Australian tree fern, lacy tree fern, scaly tree fern, or Cooper’s tree fern, is a tree fern native to Australia, in New South Wales and Queensland.

Supporting paragraphs: Cyathea propinqua Fiji
Answer: Fiji