Rock spider orchid | |
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Scientific classification | |
Kingdom: | Plantae |
Clade: | Tracheophytes |
Clade: | Angiosperms |
Clade: | Monocots |
Order: | Asparagales |
Family: | Orchidaceae |
Subfamily: | Orchidoideae |
Tribe: | Diurideae |
Genus: | Caladenia |
Species: | C. petrensis |
Binomial name | |
Caladenia petrensis | |
Caladenia petrensis, commonly known as the rock spider orchid, is a species of plant in the orchid family Orchidaceae and is endemic to the south-west of Western Australia. It has a single erect, hairy leaf and up to three pale yellow flowers with drooping lateral sepals and petals.
Caladenia petrensis is a terrestrial, perennial, deciduous, herb with an underground tuber. It is sometimes found as a solitary plant or otherwise in small clumps. It has a single erect, hairy leaf 60–110 mm (2–4 in) long, 3–6 mm (0.1–0.2 in) wide and blotched with reddish-purple near its base. Up to three flowers 90–150 mm (4–6 in) long and 80–140 mm (3–6 in) wide are borne on a spike 17–37 mm (0.7–1 in) tall. The flowers are cream-coloured to pale yellow with dark red lines and blotches. The dorsal sepal is erect, 40–70 mm (2–3 in) long, 2–3 mm (0.08–0.1 in) wide and curves slightly forwards. The sepals and petals are linear to lance-shaped near their base, then suddenly narrow to a dark brown, thread-like tip covered with glandular hairs. The lateral sepals are 150–70 mm (6–3 in) long, 3–4 mm (0.1–0.2 in) wide and spread widely but with drooping tips. The petals are 50–60 mm (2.0–2.4 in) long, 2–4 mm (0.08–0.2 in) wide and arranged like the lateral sepals. The labellum is pale yellowish-white with red stripes, 12–15 mm (0.5–0.6 in) long, 8–10 mm (0.3–0.4 in) wide with forward-facing serrations on the sides. The tip of the labellum curves downwards and there are two rows of anvil-shaped calli along its centre. Flowering occurs from late July to September. [1] [2] [3]
Caladenia petrensis was first formally described by Andrew Brown and Garry Brockman in 2007 from a specimen collected near Rothsay. The description was published in Nuytsia . [4] The specific epithet (petrensis) is a Latin word meaning "among rocks" [5] referring to the rocky habitat where this species grows. [1] [3]
The rock spider orchid is found between Canna and Paynes Find in the Avon Wheatbelt, Geraldton Sandplains and Yalgoo biogeographic regions where it grows in seasonally moist soils on rocky hills. [3] [6]
Caladenia petrensis is classified as "not threatened" by the Western Australian Government Department of Parks and Wildlife. [6]
Caladenia longicauda is a species of plant in the orchid family Orchidaceae and is endemic to the south-west of Western Australia. It is distinguished by its large leaf and by its up to five large, white flowers which have drooping sepals and petals with long, thickish brown "tails".
Caladenia longicauda subspecies borealis, commonly known as daddy-long-legs spider orchid, is a plant in the orchid family Orchidaceae and is endemic to the south-west of Western Australia. It has a single hairy leaf and up to three mostly white flowers with long, drooping sepals and petals.
Caladenia denticulata subsp. denticulata, commonly known as the yellow spider orchid, is a plant in the orchid family Orchidaceae and is endemic to the south-west of Western Australia. It has a single erect, hairy leaf and one or two yellowish flowers which have a white labellum with pale red markings.
Caladenia denticulata subsp. albicans, commonly known as the alabaster spider orchid, is a plant in the orchid family Orchidaceae and is endemic to the south-west of Western Australia. It has a single erect, hairy leaf and one or two pale creamy-white flowers which have a white labellum with red markings. The only known population occurs in a small area near Arrowsmith.
Caladenia denticulata subsp. rubella, commonly known as the clumped spider orchid, is a plant in the orchid family Orchidaceae and is endemic to the south-west of Western Australia. It has a single erect, hairy leaf and one or two dull or pinkish red flowers with prominent dull red markings and with a white labellum with red markings.
Caladenia erythronema, commonly known as the red thread spider orchid and Nyabing spider orchid, is a plant in the orchid family Orchidaceae and is endemic to the south-west of Western Australia. It has a single hairy leaf and up to three red, yellow or cream-coloured flowers with dangling, thread-like sepals and petals and a small labellum.
Caladenia exilis subsp. exilis, commonly known as the salt lake spider orchid, is a plant in the orchid family Orchidaceae and is endemic to the south-west of Western Australia. It is a relatively common spider orchid with a single erect, hairy leaf and up to three white to greenish-cream flowers with a small white, red-striped labellum.
Caladenia fluvialis, commonly known as the Brookton Highway spider orchid, is a species of orchid endemic to the south-west of Western Australia. It is a recently discovered orchid with a single hairy leaf and one or two cream-yellow flowers with red markings on the labellum.
Caladenia horistes, commonly known as the cream spider orchid, is a species of orchid endemic to the south-west of Western Australia. It has a single, hairy leaf and one or two, creamy-yellow flowers which have a red-striped labellum and long, dark, thread-like tips on the sepals and petals.
Caladenia leucochila is a species of orchid endemic to the south-west of Western Australia. It has a single leaf and one or two pale yellow to greenish cream and white flowers with dull red stripes. it is a rare species, only known from near Collie.
Caladenia hopperiana is a species of orchid endemic to the south-west of Western Australia. It has a single leaf and up to four creamy-yellow flowers with faint red markings.
Caladenia longicauda subsp. longicauda, commonly known as the white spider orchid, is a plant in the orchid family Orchidaceae and is endemic to the south-west of Western Australia. It has a single hairy leaf and up to four, mostly white flowers with long drooping, thread-like ends on the sepals and petals. It grows in woodland and forest.
Caladenia attingens subsp. effusa, commonly known as granite mantis orchid, is a subspecies of orchid endemic to the south-west of Western Australia. It has a single erect, hairy leaf and one or two green, yellow and red flowers. It differs from the other subspecies of Caladenia attingens in having smaller flowers with lateral sepals which are not upswept and a labellum which is less than 15 mm (0.6 in) wide.
Caladenia longicauda subsp. merrittii, commonly known as Merritt's white spider orchid, is a plant in the orchid family Orchidaceae and is endemic to the south-west of Western Australia. It has a single hairy leaf and up to three large, mainly white flowers with very long, drooping lateral sepals and petals, and a white broad labellum with relatively short labellum teeth. It is one of the largest spider orchids.
Caladenia longicauda subsp. redacta, commonly known as the tangled white spider orchid, is a plant in the orchid family Orchidaceae and is endemic to the south-west of Western Australia. It has a single hairy leaf and up to three large, mainly white flowers with long, drooping lateral sepals and petals. It is most similar to subspecies eminems but has smaller flowers and shorter teeth on the side of the labellum.
Caladenia perangusta, commonly known as the Boyup Brook spider orchid, is a species of orchid endemic to the south-west of Western Australia. It is a rare spider orchid with a single hairy leaf and one or two cream-yellow or red flowers with narrow, drooping sepals and petals.
Caladenia saxicola, commonly known as the banded ironstone spider orchid, is a plant in the orchid family Orchidaceae and is endemic to the south-west of Western Australia. It has a single erect, hairy leaf and one or two dull creamy-white to pale yellow flowers with spreading lateral sepals and petals.
Caladenia straminichila, commonly known as the Tenterden yellow spider orchid, is a species of orchid endemic to the south-west of Western Australia. It has a single erect, hairy leaf and one or two pale yellow flowers which have a red-striped labellum with short teeth on its sides.
Caladenia swartsiorum, commonly known as the Island Point spider orchid, is a species of orchid endemic to the south-west of Western Australia. It has a single erect, hairy leaf and up to three pale greenish-yellow and white flowers and is only known from a small area near the Harvey Estuary.
Caladenia validinervia, commonly known as the Lake Muir spider orchid, is a species of orchid endemic to the south-west of Western Australia. It has a single erect, hairy leaf and up to three greenish to creamy white flowers with red stripes on the sepals and petals. The flowers have relatively narrow sepals and petals and a relatively small labellum. It is a rare orchid only known from an area between Rocky Gully and Collie.