Pterostylis striata
From Wikipedia, the free encyclopedia
| Mainland striped greenhood | |
|---|---|
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| Pterostylis striata growing in the Brisbane Ranges National Park | |
Scientific classification  | |
| Kingdom: | Plantae |
| Clade: | Tracheophytes |
| Clade: | Angiosperms |
| Clade: | Monocots |
| Order: | Asparagales |
| Family: | Orchidaceae |
| Subfamily: | Orchidoideae |
| Tribe: | Cranichideae |
| Genus: | Pterostylis |
| Species: | P. striata |
| Binomial name | |
| Pterostylis striata | |
| Synonyms[1] | |
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Pterostylis striata, commonly known as the mainland striped greenhood, is a species of orchid endemic to south-eastern mainland Australia. As with similar orchids, the flowering plants differ from those which are not flowering. The non-flowering plants have a rosette of leaves but the flowering plants have a single flower with leaves on the flowering spike. This greenhood has a white flower with prominent dark green stripes and a brown-tipped dorsal sepal with a thread-like tip. Mainland striped greenhoods were formerly described as Pterostylis alata but that species is now recognised as a Tasmanian endemic.
Pterostylis striata is a terrestrial, perennial, deciduous, herb with an underground tuber and when not flowering, a rosette of between five and nine dark green, wrinkled leaves, 4–15 mm (0.2–0.6 in) long and 3–9 mm (0.1–0.4 in) wide. Flowering plants have a single flower 16–19 mm (0.6–0.7 in) long and 7–9 mm (0.3–0.4 in) wide borne on a spike 40–250 mm (2–10 in) high with three to five spreading stem leaves. The flowers are white with dark green stripes and a brownish tip. The dorsal sepal and petals are fused, forming a hood or "galea" over the column. The dorsal sepal curves forward with a thread-like tip 2–4 mm (0.08–0.2 in) long. The lateral sepals are held closely against the galea and have erect, thread-like tips 14–20 mm (0.6–0.8 in) long and a flat sinus with a small groove between their bases. The labellum is 7–9 mm (0.3–0.4 in) long, about 3 mm (0.1 in) wide, straight and just visible above the sinus. Flowering occurs from May to August.[2][3][4]