Apostasia elliptica
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Apostasia elliptica is a plant type from the genus Apostasia in the family of orchid (Orchidaceae). It has only been found a few times, in Sumatra , Borneo and the Malay Peninsula .
description
Apostasia elliptica grows as perennial herbaceous plants that reach stature heights of up to 35 cm. It forms a rhizome 3 mm in diameter, which is covered with 8 mm long lower leaves . The roots arise from the axils of the lower leaves, they have a diameter of 2 mm. The leaves are arranged at relatively large intervals on the stem axis, they are up to 11 cm long with a width of 2.3 cm. The leaf base forms a distinct sheath that surrounds the stem, the leaf blade is elongated or oval, it ends with a pointed tip. Of the up to 36 longitudinal arteries, five stand out clearly.
The paniculate inflorescence is sloping and contains 10 to 20 white flowers . There are no sterile bracts between the top leaf and the bottom flower . The bracts of the flowers are triangular in shape, 4 mm long by 2 mm wide, they end pointed, but without a thread-like drawn tip. The flowers are 1.5 cm in size, the six petals are 4.5 mm in length by 1.2 mm in width. All have a small attached tip, which is 0.2 mm long and 0.1 mm wide on the three outer petals ( sepals ) than on the inner petals ( petals ), where they are 0.4 mm long and 0.2 mm mm in width. The three inner petals are designed in the same way, a lip cannot be distinguished. The ovary is 11 mm long and 2.5 mm in diameter. The column consists of two fertile stamens and the stylus , which are all fused together at the base. The column becomes 1 mm long and is not bent. The stamens are 3.3 mm long and 1 mm wide, semicircular in cross section, bilobed at both ends. The stamens are only free for a short distance, the dust bags stick together. The stylus is 3.5 mm long and thus protrudes over the dust bag for a small piece, it is indistinctly provided with two grooves along its length and ends in a three-lobed scar .
Occurrence
Apostasia elliptica was known to de Vogel only from two collections: one from the west coast of Sumatra, one from the Malaysian province of Perak . As locations, he specifies forests at an altitude of around 700 m. Another location is on Borneo.
Systematics
The first description of Apostasia elliptica was in 1920 by Johannes Jacobus Smith in the Bulletin du Jardin Botanique de Buitenzorg . Within the genus Apostasia de Vogel 1969 Apostasia elliptica assigned to the section Adactylus ; In this section, in contrast to the second section, Apostasia, there are two fertile stamens and no staminodium .
Individual evidence
- ↑ a b c d EF de Vogel: Monograph of the Tribe Apostasieae (Orchidaceae) . In: Blumea . tape 17 , no. 2 , 1969, p. 344-346 .
- ^ AD Poulsen: Note on the rare terrestrial orchid Apostasia elliptica found in Borneo . In: Blumea . tape 38 , no. 1 , 1993, p. 129-130 .
- ↑ Rafaël Govaerts (ed.): Apostasia elliptica. In: World Checklist of Selected Plant Families (WCSP) - The Board of Trustees of the Royal Botanic Gardens, Kew .