Adenochilus
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Adenochilus nortonii Plate |
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The genus adenochilus from the family of the orchid (Orchidaceae) consists of only two kinds . They are small, herbaceous plants of moist forests. Their distribution is limited to Australia and New Zealand.
description
The Adenochilus species grow with a creeping, fleshy rhizome in the top soil layer. There are no roots , only so-called rhizoids . From the rhizome arise vegetative shoots with a stalked leaf and reproductive shoots with a leaf located on the inflorescence axis. The leaves are oval with a heart-shaped base and a pointed tip. Above the leaf, the shoot has one to three bracts and a flower . Two flowers per shoot are also rare. The flowers are resupinated and colored white. While the plant is otherwise hairless, the outside of the petals are covered with glandular hair. The upper sepal is broadly concave and arches over the column , the side sepals are narrower and protrude. The petals are also narrow and stand next to the upper sepal. The small lip is fused with the narrow base for a piece with the column. The free part of the lip is three-lobed, it is initially arranged parallel to the column and then bends down in the middle. On the lip there are longitudinally thickened ridges, the largest of which are yellow or orange in color. The column is elongated and slightly curved, the sides drawn out as wings or narrow lobes. At the top it bears the two-chambered stamen with eight floury pollinia . The dividing tissue between the stigma and the stamen (rostellum) is bilobed.
Systematics and distribution
There are two types:
- Adenochilus gracilis Hook.f. : It is common in New Zealand. It occurs on the North and South Islands, Stewart Island and the Chatham Islands . While it only inhabits higher altitudes in the north of the distribution area, it also occurs further south in the lowlands.
- Adenochilus nortonii Fitzg. : It is only known from a few locations in Australia in east-central New South Wales. It inhabits altitudes between 500 and 1500 meters.
Both species grow in shady areas that are well supplied with water in leaf litter or moss cushions.
literature
The information in this article comes from:
- 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
- DL Jones, T. Hopley, SM Duffy, KJ Richards, MA Clements, X. Zhang (2006): Australian Orchid Genera .
- New Zealand Plant Conservation Network
Individual evidence
- ↑ Rafaël Govaerts (ed.): Adenochilus. In: World Checklist of Selected Plant Families (WCSP) - The Board of Trustees of the Royal Botanic Gardens, Kew . Retrieved April 3, 2020.
