Diuris striata

Diuris striata is a poorly-known species of orchid that is endemic to New South Wales. It has a two grass-like leaves and about four mauve flowers with dark purple streaks on the labellum.

Diuris striata
Scientific classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Monocots
Order: Asparagales
Family: Orchidaceae
Subfamily: Orchidoideae
Tribe: Diurideae
Genus: Diuris
Species:
D. striata
Binomial name
Diuris striata
Rupp[1]

Description

Diuris striata is a tuberous, perennial herb with a two linear leaves 80–120 mm (3–5 in) long, about 4 mm (0.2 in) wide and folded lengthwise. About four mauve flowers about 20 mm (0.8 in) wide are borne on a flowering stem about 220 mm (9 in) tall. The dorsal sepal is erect, 7–9 mm (0.3–0.4 in) long, 3–6 mm (0.1–0.2 in) wide and egg-shaped. The lateral sepals are linear, about 15 mm (0.6 in) long and turned downwards. The petals spread apart from each other, egg-shaped to more or less lance-shaped, about 7 mm (0.3 in) long and 5 mm (0.2 in) wide. The labellum is about 9 mm (0.4 in) long and has three lobes. The centre lobe is egg-shaped to heart-shaped and 6 mm (0.24 in) wide with dark purple streaks. The side lobes are linear to egg-shaped with the narrower end towards the base, about 2.5 mm (0.1 in) long and 1 mm (0.04 in) wide. There are two callus ridges about 5 mm (0.2 in) long near the mid-line of the labellum. Flowering has only been observed in November.[2]

Taxonomy and naming

Diuris striata was first formally described in 1944 by Herman Rupp and the description was published in his book The Orchids of New South Wales.[3] Rupp noted "No specimens are known and the following brief description is quoted from Moore and Betche's Handbook: [Handbook of the flora of New South Wales : a description of the flowering plants and ferns indigenous to New South Wales][4] "Flowers lilac. Lateral sepals under 1 in (30 mm) long, the dorsal one rather longer than the labellum. Petals ovate-lanceolate. Lateral lobes of the labellum short, acute, recurved, the middle lobe broadly spathulate. Flowers not blotched, but the labellum barred with darker lines".[5] The specific epithet (striata) is derived from the Latin word meaning stria meaning "furrow", "channel" or "stripe".[6]

Distribution

This orchid is only known from the type collection made near Forbes before 1889.[2]

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References
  1. "Diuris striata". World Checklist of Selected Plant Families (WCSP). Royal Botanic Gardens, Kew.
  2. Jones, David L. "Diuris striata". Royal Botanic Garden Sydney. Retrieved 7 April 2018.
  3. "Duiris striata". APNI. Retrieved 7 April 2018.
  4. Moore, Charles; Betche, Ernst. "Handbook of the flora of New South Wales : a description of the flowering plants and ferns indigenous to New South Wales". National Library of Australia. Retrieved 8 April 2018.
  5. Rupp, Herman M.R. (1944). The Orchids of New South Wales. Sydney: Government Printer of N.S.W. p. 15.
  6. Brown, Roland Wilbur (1956). The Composition of Scientific Words. Washington, D.C.: Smithsonian Institution Press. p. 359.
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