Rosy hyacinth orchid | |
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Dipodium roseum in Lake Conjola | |
Scientific classification | |
Kingdom: | Plantae |
Clade: | Tracheophytes |
Clade: | Angiosperms |
Clade: | Monocots |
Order: | Asparagales |
Family: | Orchidaceae |
Subfamily: | Epidendroideae |
Genus: | Dipodium |
Species: | D. roseum |
Binomial name | |
Dipodium roseum | |
Dipodium roseum, commonly known as rosy hyacinth-orchid [3] or pink hyacinth-orchid, [4] is a leafless saprophytic orchid found in east and south-eastern Australia. In summer it produces a tall flowering stem with up to fifty pale pink flowers with small, dark red spots. A widespread and common species it is often confused with D. punctatum but has darker, less heavily spotted flowers.
Dipodium roseum is a leafless, tuberous, perennial, mycoheterotrophic herb. Between fifteen and fifty pale pink flowers with small dark red spots and 20–30 mm (0.8–1 in) wide are borne on a green to dark reddish black flowering stem 40–100 cm (20–40 in) tall. The sepals and petals are linear to elliptic, 13–20 mm (0.5–0.8 in) long, 3–6 mm (0.1–0.2 in) wide and free from each other with their tips curved backwards. The labellum is pink with dark lines, 10–15 mm (0.4–0.6 in) long, 4–6.5 mm (0.2–0.3 in) wide and has three lobes with their tips turned upwards. The centre lobe has a broad band of pink to mauve hairs. A rare white-flowering form also exists. Flowering occurs from November to February. [3] [5] [6] [7]
This orchid is often confused with D. punctatum. D. roseum has a broader band of hairs and striping on its labellum, smaller spots and much more recurved sepals and petals. D. punctatum lacks striping on its labellum, has much more pronounced spotting, and has flat or barely recurved sepals and petals. [6]
Dipodium roseum was first formally described in 1991 by David Jones and Mark Clements and the description was published in Australian Orchid Research. The type specimen was collected in Montrose in Victoria's Dandenong Ranges. [1] [8] The specific epithet (roseum) is a Latin word meaning "rose-coloured", [9] referring to the colour of the flowers of this orchid. [8] The species was previously included in a wider circumscription of Dipodium punctatum . [1] [6]
The rosy hyacinth orchid grows in a range of habitats from dry woodland to wet forests. It occurs in Queensland south from Gympie, on the coast and ranges of New South Wales and the Australian Capital Territory and in most of Australia where it is the most common Dipodium . It is also found in the south-east of South Australia and is the only member of the genus to occur in Tasmania. [3] [5] [6] [10]
Pollination of this species, as for all species in the genus, is by native bees and wasps. [3] : 270
No leafless species of Dipodium has been sustained in cultivation due to the inability to replicate its association with mycorrhizal fungi in a horticultural context. [3] : 270
Dipodium, commonly known as hyacinth orchids, is a genus of about forty species of orchids native to tropical, subtropical and temperate regions of south-east Asia, New Guinea, the Pacific Islands and Australia. It includes both terrestrial and climbing species, some with leaves and some leafless, but all with large, often colourful flowers on tall flowering stems. It is the only genus of its alliance, Dipodium.
Dipodium punctatum, commonly known as the blotched hyacinth-orchid, is a leafless orchid that is a native to eastern and south-eastern continental Australia. In summer it produces a tall flowering stem with up to sixty pale to bright pink flowers with heavy red blotches. A widespread and common species it is often confused with D. roseum and some authorities regard it as a synonym of D. squamatum.
Dipodium elegantulum, commonly known as the elegant hyacinth orchid, is a leafless orchid that is endemic to Queensland. In spring and summer it has up to sixty pale to dark pink flowers with a few darker spots and streaks near the tips, on a tall flowering stem.
Burnettia cuneata, commonly known as the lizard orchid, is the only species of the flowering plant genus Burnettia in the orchid family, Orchidaceae. It is a leafless terrestrial, mycotrophic herb with one or two leaf-like bracts and up to seven flowers that are brownish on the back and pink or white inside. It is endemic to southeastern Australia where it grows in dense thickets in swamps.
Cryptostylis hunteriana, commonly known as the leafless tongue-orchid is a flowering plant in the orchid family Orchidaceae and is endemic to south eastern Australia. It is leafless but has up to ten green flowers with a more or less erect, dark reddish brown labellum.
Dipodium hamiltonianum, commonly known as yellow hyacinth-orchid, is a leafless mycoheterotroph orchid that is endemic to eastern Australia. It has up to twenty five greenish flowers with dark red spots on a tall flowering stem.
Dipodium pardalinum, commonly known as spotted hyacinth-orchid or leopard hyacinth-orchid, is a leafless hemiparasitic orchid that is endemic to south-eastern Australia.
Dipodium variegatum, commonly known as the slender hyacinth-orchid, or blotched hyacinth-orchid, is a leafless mycoheterotrophic orchid that is endemic to south-eastern Australia. It forms mycorrhizal relationships with fungi of the genus Russula.
Dipodium campanulatum, commonly known as the bell-flower hyacinth orchid, is a leafless mycoheterotroph orchid that is endemic to south-eastern Australia. In summer it has up to thirty five white flowers with large, dark red spots and blotches.
Dipodium stenocheilum, commonly known as tropical hyacinth-orchid, is a leafless saprophytic orchid that is endemic to northern Australia. For most of the year the plant is dormant but in summer it produces a tall flowering stem with up to twenty five white flowers with purple spots and a mauve labellum.
Dipodium ensifolium, commonly known as leafy hyacinth-orchid, is an orchid species that is endemic to north-east Queensland. It has sword-shaped leaves and up to twenty pink to mauve flowers with purplish spots and blotches.
Dipodium atropurpureum, commonly known as the purple hyacinth orchid, is a mostly leafless mycoheterotrophic orchid that is endemic to New South Wales. In summer it has up to forty dark pinkish purple to reddish purple flowers with darker spots and blotches on a tall flowering stem.
Dipodium pulchellum is an almost leafless orchid that is endemic to north-east New South Wales and south-east Queensland in Australia. Up to forty pink flowers with darker blotches are borne in summer and winter on flowering spikes up to 90 cm (40 in) long.
Caladenia mentiens, commonly known as lesser fingers, is a species of orchid endemic to south-eastern Australia which grows singly, or in small, loose groups. It has a single, sparsely hairy, erect, linear leaf and a single whitish or pinkish coloured flower with a darker back and a cream-coloured labellum.
Caladenia phaeoclavia, commonly known as the brown-clubbed spider orchid is a species of orchid endemic to New South Wales. It has a single, hairy leaf and a single light to dark green flower with red stripes and thick, brownish club-like tips on the sepals.
Caladenia vulgaris, commonly known as summer fingers, or slender pink-fingers is a species of orchid endemic to southern Australia. It has a single, long, erect, hairy leaf and one or two pink or whitish flowers.
Prasophyllum fitzgeraldii, commonly known as FitzGerald's leek orchid, is a species of orchid endemic to South Australia. It has a single tube-shaped leaf and up to thirty five green or reddish-brown flowers with a pink to purple labellum. It was previously thought to also occur in Victoria.
Prasophyllum roseum, commonly known as the pink lip leek orchid, is a species of orchid endemic to southern continental Australia. It has a single tube-shaped leaf and up to thirty greenish flowers with a pink labellum. It is a recently described plant, previously included with P. fitzgeraldii, but distinguished from that species by its smaller, less crowded flowers, with more spreading lateral sepals and different labellum callus. It grows in the south-east of South Australia and in western Victoria.
Calochilus pruinosus, commonly known as the mallee beard orchid, is a species of orchid endemic to southern continental Australia. It has up to fifteen dull greenish, pinkish or brownish flowers with red lines and a labellum with a purplish "beard", but is leafless.
Epipogium roseum, commonly known as ghost orchid, leafless nodding orchid or 虎舌兰 , is a leafless terrestrial mycotrophic orchid in the family Orchidaceae. It has up to sixteen cream-coloured, yellowish or pinkish flowers with an enlarged ovary on a fleshy hollow flowering stem. This ghost orchid is widely distributed in tropical Africa, Asia, Southeast Asia, New Guinea, Australia and some Pacific Islands.