| Polystachya subdiphylla | |
|---|---|
 | |
| Flower of Polystachya subdiphylla | |
Scientific classification  | |
| Kingdom: | Plantae |
| Clade: | Tracheophytes |
| Clade: | Angiosperms |
| Clade: | Monocots |
| Order: | Asparagales |
| Family: | Orchidaceae |
| Subfamily: | Epidendroideae |
| Genus: | Polystachya |
| Species: | P. subdiphylla |
| Binomial name | |
| Polystachya subdiphylla | |
Polystachya subdiphylla is a species of orchid native to Tanzania.
P. subdiphylla was described by English botanist V. S. Summerhayes in 1942 based on a single specimen collected in 1935. It is placed in Polystachya sect. Cultriformes on the basis of its single-leaved pseudobulbs. [2] [3]
P. subdiphylla is known only from the Nguru and Uluguru Mountains in Tanzania. [1] [4] It grows in montane forests around 2,000 m (6,600 ft) above sea level. [3]
P. subdiphylla is a herbaceous plant growing 20–35 cm (7.9–13.8 in) tall. The conical pseudobulbs, each measuring 2–4 cm (0.79–1.57 in) long and 5–10 mm (0.20–0.39 in) wide, arise in clusters from a short, creeping rhizome. The leaves are lanceolate to ovate-lanceolate, measuring 15–25 cm (5.9–9.8 in) long and 1.1–1.7 cm (0.43–0.67 in) wide. [2] The inflorescence is a simple raceme measuring 9.8–14 cm (3.9–5.5 in) long and bears up to 5 flowers. The flowers are mostly white, with red and yellow spotting on the labellum. The petals are obovate-lanceolate and measure 10–13.5 mm (0.39–0.53 in) long and 3.5–4 mm (0.14–0.16 in) wide. The dorsal sepal is lanceolate and measures 12–15.8 mm (0.47–0.62 in) long and 4.6–4.8 mm (0.18–0.19 in) wide. The lateral sepals are obliquely triangular and measure 10.5–16 mm (0.41–0.63 in) long and 7–9.5 mm (0.28–0.37 in) wide. The labellum is tri-lobed and strongly recurved, measuring 10–11.5 mm (0.39–0.45 in) long and 9.5–12.5 mm (0.37–0.49 in) wide with a covering of small hairs. The column measures 2–2.5 mm (0.079–0.098 in) long. [3] [4]
P. subdiphylla is listed as endangered by the International Union for Conservation of Nature under criteria B1ab(iii) and B2ab(iii), based on the small number of locations at which this species is present and the threat of habitat decline. P. subdiphylla is present within the Nguru South Forest Reserve, a protected area in the Nguru Mountains, however, other populations occur in unprotected areas that are at risk of deforestation due to agriculture. [1]
Dendrobium crumenatum, commonly called pigeon orchid, or 木石斛 is an epiphytic orchid in the family Orchidaceae and is native to Asia, Southeast Asia, New Guinea and Christmas Island. It has two rows on leaves along its pseudobulb and relatively large but short-lived, strongly scented white flowers. It usually grows in exposed positions in lowland rainforest and coastal scrub.
Coelogyne pandurata is a species of orchid native to Southeast Asia. It was first described by English botanist John Lindley in 1853 based on a specimen collected from Sarawak in 1852 by Hugh Low.
Dendrobium kingianum, commonly known as the pink rock orchid, is a flowering plant in the orchid family Orchidaceae and is endemic to eastern Australia. It usually grows on rocks, rarely as an epiphyte, and has thin, spreading leaves and spikes of up to fifteen, usually pink flowers in late winter to spring. It is popular in Australian native horticulture and is a commonly cultivated orchid among Australian orchid species growers.
Cymbidium madidum, commonly known as the giant boat-lip orchid, is a plant in the orchid family and is endemic to north-eastern Australia. It is a clump-forming epiphyte or lithophyte with crowded pseudobulbs, each with between four and eight flat, strap-shaped, thin leaves and up to seventy olive green flowers with the sepals and petals curving forwards. It is found in moist habitats in eastern Queensland and north-eastern New South Wales.
Coelogyne flaccida is a species of orchid that is native to southeast Asia and northeastern South Asia. Cultivated as an ornamental plant, it is also known as the bearded coelogyne and the loose coelogyne.
Dendrobium bigibbum, commonly known as the Cooktown orchid or mauve butterfly orchid, is an epiphytic or lithophytic orchid in the family Orchidaceae. It has cylindrical pseudobulbs, each with between three and five green or purplish leaves and arching flowering stems with up to twenty, usually lilac-purple flowers. It occurs in tropical North Queensland, Australia and New Guinea.
Dendrobium jonesii, commonly known as the oak orchid is a species of epiphytic or lithophytic orchid endemic to far north Queensland. It has spindle-shaped pseudobulbs, up to seven thin, dark green leaves and up to thirty five crowded, star-like, fragrant cream-coloured or white flowers with purple markings on the labellum.
Dendrobium tetragonum, commonly known as the tree spider orchid, is a variable species of epiphytic or lithophytic orchid endemic to eastern Australia. Tree spider orchids are unusual in having pendulous pseudobulbs that are thin and wiry near the base then expand into a fleshy, four-sided upper section before tapering at the tip. There are only a few thin but leathery leaves at the end of the pseudobulbs and up to five flowers on relatively short flowering stems. To allow for the variations in the species there are five subspecies and a variety, some with a unique common name.
Bulbophyllum lageniforme, commonly known as the smooth strand orchid, is a species of epiphytic or lithophytic orchid that is endemic to tropical North Queensland. It has flattened, pale green, grooved, clump-forming pseudobulbs, stiff, dark green leaves and up to four cream-coloured or pale green flowers with a pink labellum. It usually grows on shrubs, trees and rocks in highland rainforest.
Bulbophyllum macphersonii, commonly known as eyelash orchids, is a species of epiphytic or lithophytic orchid that is endemic to Queensland. It has tiny, crowded, slightly flattened, dark green pseudobulbs, a single thick, fleshy leaf and a single dark red to purplish red flower with a narrow labellum. It grows on trees and rocks in sheltered places.
Bulbophyllum radicans, commonly known as the striped pyjama orchid, is a species of epiphytic or lithophytic orchid with long, hanging stems with roots near the base and covered with brown, papery bracts which partially hide the pseudobulbs. Each pseudobulb has a single thin leaf. A single small pink, cream-coloured or yellow flower with red or purplish stripes is borne on a thin flowering stem that emerges from the base of the pseudobulb. This orchid grows on trees or rocks in or near rainforest in tropical North Queensland.
Bulbophyllum windsorense, commonly known as the thread-tipped rope orchid, is a species of epiphytic orchid that has small pseudobulbs partly hidden by brown, papery bracts. Each pseudobulb has a single fleshy, dark green, grooved leaf and one or two cream-coloured or greenish flowers. It mainly grows near the breezy tops of trees, especially Callitris macleayana trees and is endemic to tropical North Queensland.
Spathoglottis paulinae, commonly known as the small purple orchid, is a plant in the orchid family and is native to New Guinea and Tropical North Queensland. It is an evergreen terrestrial orchid with crowded pseudobulbs, between four and seven large, pleated leaves and up to thirty mauve to purple flowers.
Oeceoclades flavescens is a terrestrial orchid species in the genus Oeceoclades that is endemic to northeastern Madagascar. It was first described by the French botanists Jean Marie Bosser and Philippe Morat in 2001. The type specimen was collected in 1954 from the wet undergrowth of a coastal forest near Maroantsetra; it is the only known collection of this species. The specific epithet flavescens refers to the pale yellow flowers.
Malaxis seychellarum is a species of orchid endemic to the Seychelles Islands in the Indian Ocean. First described in 1902, it is now considered a vulnerable species.
Dendrobium falcorostrum, commonly known as the beech orchid, is a species of epiphytic orchid endemic to eastern Australia. It has spindle-shaped pseudobulbs, each with between two and five leathery leaves and up to twenty crowded white flowers with purple markings on the labellum.
Dendrobium convexum, commonly known as the piggyback orchid, is an epiphytic orchid in the family Orchidaceae. It has a creeping, brittle root, erect pseudobulbs with a single leaf on the top and one or two cream-coloured, short-lived flowers with a red and yellow labellum. It is native to Southeast Asia, New Guinea and tropical North Queensland, Australia.
Dendrobium clementsii, commonly known as the Cape York crimp orchid, is a species of epiphytic or lithophytic orchid that is endemic to tropical North Queensland, Australia. It has long stems, tapering pseudobulbs each with a thin, leathery dark green leaf and clusters of short-lived, cream-coloured flowers with a purple labellum.
Dendrobium biconvexum, commonly known as the Mount Windsor rock orchid, is a species of lithophytic orchid that is endemic to tropical North Queensland, Australia. It has spindle-shaped pseudobulbs, between two and four thick, leathery leaves and up to seventy five white or cream-coloured flowers with purple markings on the labellum.
Thelasis capitata, commonly known as the conical fly orchid, is a plant in the orchid family. It is a clump-forming epiphyte with flattened pseudobulbs, each with a single strap-shaped leaf. A large number of small yellowish green flowers are arranged in a cone shape on a thin but stiff flowering stem. This orchid is found from Thailand to Malesia, including on Christmas Island.
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