Apostasia nuda
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Drawing of Apostasia nuda from the first description in |
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| R.Br. in N. Wallich |
Apostasia nuda is a plant type from the genus Apostasia in the family of orchid (Orchidaceae). It grows in the shade of moist forests in Southeast Asia. There are plants with white and yellow flowers.
description
Apostasia nuda grows as perennial herbaceous plants that reach heights of 40 to 60 cm, rarely up to 70 cm. It forms a rhizome 2 to 3 mm in diameter, which is covered with 5 mm long lower leaves . The roots arise from the axils of the lower leaves and the lowest leaves , they have a diameter of 2 to 3 mm. The leaves can be close together or at relatively large intervals on the stem axis , they are 17 to 27 cm long (rarely the length is only 13 cm or up to 45 cm) with a width of 0.6 to 1.3 cm ( rarely only 0.45 or up to 1.5 cm). The leaf base forms an indistinctly separated sheath that surrounds the stem, the leaf blade is linear-lanceolate, it ends pointedly with a thread-like, 6 to 13 mm long tip. Of the 18 to 80 longitudinal arteries, mostly five, occasionally only three, are clearly prominent.
Flowering and fruiting plants were found in all seasons. For Vietnam, Averyanov specifies a flowering period in January and February. At the end of the stem there are numerous tightly packed, up to 20 mm long and 4 mm wide bracts from which the paniculate , sloping inflorescence arises. It consists of two to twelve racemose partial inflorescences , each of which bears 15 to 25, occasionally up to 32 flowers . The bracts of the flowers are narrowly triangular to lanceolate, 2 to 10 mm long and 1 to 1.5 mm wide, they end pointed. Bracts and bracts, like the leaves, have a tiny, thread-like tip. The flowers are white or yellow, with the white being more common. When the petals open, they roll backwards. The flowers are 1.2 to 1.4, rarely up to 1.9 cm, the six petals are 3.3 to 4.5 mm in length. The three outer petals ( sepals ) are 0.6 to 1 mm wide, slightly wider than the tepals , which are 0.5 to 0.6 mm, rarely up to 1 mm wide. All petals have a small tip (about 0.3 mm long and 0.1 mm wide). The three inner petals are designed in the same way, a lip cannot be distinguished. The ovary is 8 to 11 mm long and 0.8 to 1 mm in diameter. The column consists of two fertile stamens and the stylus , which are all fused together at the base. The column is 0.5 to 1.1 mm long and is usually clearly curved. The stamens are 3.2 to 3.5 mm long and 0.7 to 1.2 mm wide, forming a broad half ellipse in cross section, bilobed at the base, at the tip the connective protrudes slightly beyond the anthers. The stamens are only free for a short distance, the dust bags stick together. The stylus is 3.6 to 4 mm long and thus protrudes above the dust bag for a small piece, it is indistinctly provided with two grooves along its length. The scar can have different shapes, flattened, spherical, irregular square, conical or three-lobed. The fruit is green, 12 to 15 mm long and 1 mm in diameter. It contains the seeds, the surface of which is evenly indented to almost smooth.
Chromosome number
The number of chromosomes is 2n = 48.
Occurrence
Apostasia nuda has a large distribution area that extends from Myanmar to Thailand, the Malay Peninsula to the islands of Borneo, Sumatra and Java. The locations are in forests at an altitude of 100 to 1300 m. Averyanov specifies locations in coniferous and deciduous forests over shale for Vietnam. The altitude of the plants found ranges from 320 to 1400 m. On Java, Apostasia nuda was only found in the west of the island, where it occurs in moist forests at altitudes between 800 and 1000 m.
use
De Vogel reports that the boiled roots were used medicinally on the Malay Peninsula.
Systematics
The first description of Apostasia nuda was in 1830 by Robert Brown in Nathaniel Wallich 's Plantae Asiaticae Rariores . Within the genus Apostasia , de Vogel placed Apostasia nuda in the section Adactylus in 1969 ; In this section, in contrast to the second section, Apostasia, there are two fertile stamens and no staminodium .
Individual evidence
- ↑ a b c d e f g h EF de Vogel: Monograph of the Tribe Apostasieae (Orchidaceae) . In: Blumea . tape 17 , no. 2 , 1969, p. 346-348 .
- ^ A b Leonid Averyanov: The Orchids of Vietnam. Illustrated Survey . In: Turczaninowia . tape 11 , no. 1 , 2008, p. 56-57 .
- ^ A b Gunnar Seidenfaden, Jeffrey J. Wood: The orchids of peninsular Malaysia and Singapore . Olsen & Olsen, Fredensborg 1992, ISBN 87-85215-24-4 , pp. 37 .
- ^ Tropicos. [1]
- ↑ Jim B. Comber: Orchids of Java . Bentham-Moxon Trust, Kew 1990, ISBN 0-947643-21-4 .
- ↑ Rafaël Govaerts (ed.): Apostasia nuda. In: World Checklist of Selected Plant Families (WCSP) - The Board of Trustees of the Royal Botanic Gardens, Kew .
