Aporostylis bifolia
| Aporostylis bifolia | ||||||||||||
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Aporostylis bifolia |
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| Scientific name of the genus | ||||||||||||
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| Rupp & Hatch | ||||||||||||
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| Aporostylis bifolia | ||||||||||||
| ( Hook.f. ) Rupp & Hatch |
The orchid Aporostylis bifolia is the only species in the genus Aporostylis . The small, herbaceous plants are about five to twenty centimeters tall. They are common in New Zealand.
description
Aporostylis bifolia forms rounded to conical, underground tubers ; new tubers are formed some distance from the plant. The slender sprout grows erect, he's green, glandular hairs to reddish and below the leaves of Lower leaves wrapped. Two leaves sit close together just above the ground. If the plants grow in the middle of higher vegetation, the stem can also be a little more stretched and the two leaves can be a little further apart. The leaves are variably shaped, even within a population the leaf shape can range from lanceolate to broadly oval, the end is pointed. The leaf blade is often reddish or brownish spotted, more or less hairy glandular and ciliate on the edge. The lower leaf becomes about 10 to 15 centimeters long, the upper one is smaller.
The shoot has a single flower above the leaves . Two flowers per shoot are also rare. The flowers measure about 2.5 centimeters and are resupinated , white or pink in color. The bract partially envelops the ovary . The outside of the sepals and ovaries are covered with glandular hair. The upper sepal is broadly lanceolate, concave, pointed or obtuse. The lateral sepals are narrower and pointed, the petals even narrower, shorter and also ending with a point. The oval lip is undivided and sessile, two yellow ridges sit near the base. The lip and base of the column are often mottled dark. The column is elongated and slightly curved, the sides drawn out as wings or narrow lobes. It bears the two-chambered stamen with two granular pollinia at the top .
distribution
Aporostylis bifolia is common in New Zealand . To the north the distribution extends to Te Moehau on the North Island, the South Island, Stewart Island , the Chatham Islands , as well as Auckland Island , Campbell Island and the Antipode Islands are also populated. While it only inhabits higher altitudes in the north of the distribution area, it also occurs further south in the lowlands.
The plants grow in places that are well supplied with water, such as moors or drainage points, in tussock grassland, in bushes and forests. They can often be found in pine plantations.
literature
- LB Moore, E. Edgar (1970): Flora of New Zealand . Volume II. Indigenous Tracheophyta - Monocotyledons except Graminae . First electronic edition, Landcare Research, June 2004. Transcr. AD Wilton, IML Andres. Flora of New Zealand
- Edwin D. Hatch (1949): Aporostylis R. and Hh., Townsonia Cheesmn., And the New Zealand Forms of Chiloglottis R. Br. Transactions and Proceedings of the Royal Society of New Zealand, Vol. 77, 1948-49. On-line
Web links
- Aporostylis bifolia . New Zealand Plant Conservation Network,accessed August 7, 2014.