''Pterostylis umbrina'', commonly known as the broad-sepaled leafy greenhood, is a plant in the orchid family Orchidaceae and is endemic to the Australian Capital Territory and New South Wales on the Southern Tablelands. As with similar greenhoods, plants in flower differ from those that are not. Those not in flower have a rosette of leaves flat on a short stalk. Plants in flower have up to six green flowers with darker green stripes with stem leaves but lack a rosette.

Description

''Pterostylis diminuta'', is a terrestrial, perennial, deciduous,

herb In general use, herbs are a widely distributed and widespread group of plants, excluding vegetables and other plants consumed for macronutrients, with savory or aromatic properties that are used for flavoring and garnishing food, for medicinal ...

with an underground tuber. Plants not in flower have a rosette of between three and five, lance-shaped or elliptic leaves on a stalk tall, each leaf long and wide. When flowering, plants lack a rosette but have up to six flowers on a flowering spike high with four to seven linear to lance-shaped stem leaves that are long and wide. The flowers are long, wide. The dorsal sepal and

petal Petals are modified Leaf, leaves that surround the reproductive parts of flowers. They are often advertising coloration, brightly colored or unusually shaped to attract pollinators. All of the petals of a flower are collectively known as the ''c ...

s are joined to form a hood called the "galea" over the column. The galea is green with darker green stripes and a curved, orange-brown tip. The petals are long, wide and expanded near the middle. The lateral sepals turn downwards and are long, wide and joined for more than half their length. The labellum is long, about wide and brownish with a dark stripe along its mid-line. Flowering occurs from August to October.

Taxonomy and naming

The broad-sepaled leafy greenhood was first formally described in 2006 by David Jones and Mark Clements and given the name ''Bunochilus umbrinus''. The description was published in ''Australian Orchid Research'' from a specimen collected in the Australian Capital Territory. In 2007,

Gary Backhouse Gary may refer to: *Gary (given name), a common masculine given name, including a list of people and fictional characters with the name *Gary, Indiana, the largest city named Gary Places ;Iran * Gary, Iran, Sistan and Baluchestan Province ;Uni ...

changed the name to ''Pterostylis umbrina''. The

specific epithet In taxonomy, binomial nomenclature ("two-term naming system"), also called nomenclature ("two-name naming system") or binary nomenclature, is a formal system of naming species of living things by giving each a name composed of two parts, bot ...

(''umbrina'') is a Latin word meaning "dull brown", referring to the colour of the labellum compared to '' P. macrosepala''.

Distribution and habitat

''Pterostylis umbrina'' occurs on Black Mountain in the Australian Capital Territory and in disjunct populations in New South Wales between Burrinjuck and Tumut. It grows in forest with grasses and shrubs.

References

{{Taxonbar, from=Q17329278

umbrina ''Umbrina'' is a genus of fish from the croaker family Sciaenidae. The genus contains 17 species occurring in tropical and warm temperate waters of the Atlantic, the Mediterranean, the Western Indian Ocean and the eastern Pacific. Description T ...

Orchids of New South Wales Orchids of the Australian Capital Territory Plants described in 2006