Pterostylis turfosa

Pterostylis turfosa, commonly known as the bearded bird orchid, is a species of orchid which is endemic to the south-west of Western Australia. Flowering plants have a single translucent green flower with darker green veins, on a flowering stem with up to eighteen stem leaves. It is one of a number of bearded orchids, some of which have yet to be formally described, all of which have a distinctive feather-like labellum.

Bearded bird orchid
Pterostylis turfosa growing near Mount Chudalup
Scientific classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Monocots
Order: Asparagales
Family: Orchidaceae
Subfamily: Orchidoideae
Tribe: Cranichideae
Genus: Pterostylis
Species:
P. turfosa
Binomial name
Pterostylis turfosa
Synonyms[2]

Plumatichilos turfosus (Endl.) Szlach.

Description

Pterostylis turfosa is a terrestrial, perennial, deciduous, herb with an underground tuber. It has between ten and eighteen dark green leaves crowded around the base of the stem and extending upwards, the leaves 10–25 millimetres (0.4–1 in) long and 3–7 millimetres (0.1–0.3 in) wide. Flowering plants have a single translucent green flower with darker green lines, the flower 45–55 millimetres (1.8–2.2 in) long and 6–7 millimetres (0.2–0.3 in) wide arranged on a flowering stem 100–250 millimetres (4–10 in) high. The dorsal sepal and petals are fused to form a hood or "galea" over the column, the dorsal sepal with curved point 25–35 millimetres (0.98–1.4 in) long. The lateral sepals are turned downwards, joined near their bases to form a fleshy pad with tapering tips 40–50 mm (1.6–2.0 in) long and parallel to each other. The labellum is 25–30 millimetres (0.98–1.2 in) long and thread-like, bearded with yellow hairs 3–7 millimetres (0.1–0.3 in) long and ending in a thin, light brown knob. The flowers appear from September to October.[3][4][5]

Taxonomy and naming

Pterostylis turfosa was first described in 1846 by Stephan Endlicher and the description was published in the second volume of Lehmann's book Plantae Preissianae.[1][6] The specific epithet (turfosa) is a Latin word meaning "peaty".[7]

Distribution and habitat

The bearded bird orchid grows in a wide variety of habitats, from shallow soil pockets on granite outcrops to forest but mainly close to the coast. It occurs between Bunbury and East Mount Barren.[3][4][5]

References
  1. "Pterostylis turfosa". APNI. Retrieved 22 July 2016.
  2. "Pterostylis turfosa". World Checklist of Selected Plant Families (WCSP). Royal Botanic Gardens, Kew.
  3. Jones, David L. (2006). A complete guide to native orchids of Australia including the island territories. Frenchs Forest, N.S.W.: New Holland. p. 336. ISBN 978-1877069123.
  4. Brown, Andrew; Dundas, Pat; Dixon, Kingsley; Hopper, Stephen (2008). Orchids of Western Australia. Crawley, Western Australia: University of Western Australia Press. p. 394. ISBN 9780980296457.
  5. Hoffman, Noel; Brown, Andrew (2011). Orchids of South-West Australia (3rd ed.). Gooseberry Hill: Noel Hoffman. p. 447. ISBN 9780646562322.
  6. Endlicher, Stephan; Lehmann, Johann Georg Christian (ed.) (1846). Plantae Preissianae sive Enumeratio plantarum quas in Australasia occidentali et meridionali-occidentali annis 1838-1841 (Volume 2). v.2. Hamburg: Sumptibus Meissneri. p. 5. Retrieved 22 July 2017.CS1 maint: extra text: authors list (link)
  7. Quattrocchi, Umberto (2006). CRC world dictionary of grasses. Boca Raton: Taylor & Francis. p. 2199. ISBN 978-0849313035.
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