Pterostylis rubiginosa
From Wikipedia, the free encyclopedia
| Pterostylis rubiginosa | |
|---|---|
 | |
| Near the upper Orara River | |
Scientific classification  | |
| Kingdom: | Plantae |
| Clade: | Tracheophytes |
| Clade: | Angiosperms |
| Clade: | Monocots |
| Order: | Asparagales |
| Family: | Orchidaceae |
| Subfamily: | Orchidoideae |
| Tribe: | Cranichideae |
| Genus: | Pterostylis |
| Species: | P. rubiginosa |
| Binomial name | |
| Pterostylis rubiginosa | |
| Synonyms[1] | |
|
Speculantha rubiginosa D.L.Jones & L.M.Copel. | |
Pterostylis rubiginosa is a species of orchid endemic to northeastern New South Wales. Flowering and non-flowering plants have a rosette of leaves that is withered by the time flowering occurs. Flowering plants have up to seven white flowers with rusty brown stripes, on a wiry flowering stem.
Pterostylis rubiginosa is a terrestrial, perennial, deciduous, herb with an underground tuber and when not flowering, a rosette of between two and seven spreading, egg-shaped leaves 5–10 mm (0.2–0.4 in) long and 4–8 mm (0.2–0.3 in) wide. Flowering plants have a similar rosette on side growth but the leaves wither before the flowers open. Up to seven flowers are well spaced along a thin, wiry flowering stem 100–250 mm (4–10 in) high but only about three flowers are open at the same time. The flowers are white with rusty brown stripes, 8–9 mm (0.3–0.4 in) long and about 3 mm (0.1 in) wide. The dorsal sepal and petals are fused, forming a hood or "galea" over the column. The dorsal sepal is lance-shaped to egg-shaped, 11–13 mm (0.4–0.5 in) long and 4–6 mm (0.16–0.24 in) wide, curves forward and has a short point. The lateral sepals are erect, held closely against the galea and joined for most of their length, leaving an opening about 2 mm (0.08 in) wide. The tips of the lateral sepals curve forwards and are about 2 mm (0.08 in) long but do not reach the top of the galea. The labellum is not visible above the sinus between the lateral sepals. Flowering has been observed between mid November and early December.[2]