Prasophyllum pyriforme

Prasophyllum pyriforme, commonly known as the graceful leek orchid is a species of orchid species endemic to eastern Australia. It has a single tubular leaf and up to fifty greenish flowers with a pink or white labellum. As with others in the genus, the labellum is above the column rather than below it.

Graceful leek orchid
Scientific classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Monocots
Order: Asparagales
Family: Orchidaceae
Subfamily: Orchidoideae
Tribe: Diurideae
Subtribe: Prasophyllinae
Genus: Prasophyllum
Species:
P. pyriforme
Binomial name
Prasophyllum pyriforme
Synonyms[1]

Prasophyllum chasmogamum R.J.Bates & D.L.Jones

Description

Prasophyllum pyriforme is a terrestrial, perennial, deciduous, herb with an underground tuber and a single smooth dark green, tube-shaped leaf 100–250 mm (4–10 in) long and 3–6 mm (0.1–0.2 in) in diameter near its reddish base. Between thirty and fifty greenish or mauve flowers are crowded on a flowering stem 100–150 mm (4–6 in) long. The ovary is 4–6 mm (0.16–0.24 in) long, the petals are 7–9 mm (0.3–0.4 in) long and the lateral sepals are 8–11 mm (0.3–0.4 in) long, erect, linear to lance-shaped and fused at their sides for most of their length. The labellum is 6–8 mm (0.2–0.3 in) long, curves upwards to almost touch the lateral sepals and is pink or white with wavy edges. The callus in the centre of the labellum is greenish, wrinkled and extends almost to the tip of the labellum. Flowering occurs in November and December.[2][3][4]

Taxonomy and naming

Prasophyllum pyriforme was first formally described in 1933 by Edith Coleman and the description was published in The Victorian Naturalist from a specimen collected near Doncaster.[1][5] The specific epithet (pyriforme) is derived from the Latin words pyrum meaning "pear"[6]:593 and forme meaning "shape".[6]:28

Distribution and habitat

The graceful leek orchid grows in woodland and open forest and flowers more prolifically after fire. It occurs in southern and eastern Victoria and on the south coast of New South Wales.

References
  1. "Prasophyllum pyriforme". APNI. Retrieved 12 October 2017.
  2. Jeanes, Jeff. "Prasophyllum pyriforme". Royal Botanic Gardens Melbourne - vicflora. Retrieved 12 October 2017.
  3. "Prasophyllum pyriforme". Royal Botanic Garden Sydney - plantnet. Retrieved 12 October 2017.
  4. "Prasophyllum pyriforme". Yarra Ranges Shire Council. Retrieved 12 October 2017.
  5. Coleman, Edith (1932). "A new Victorian Prasophyllum". The Victorian Naturalist. 49: 195. Retrieved 12 October 2017.
  6. Brown, Roland Wilbur (1956). The Composition of Scientific Words. Washington, D.C.: Smithsonian Institution Press.
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