Amomum chevalieri

from Wikipedia, the free encyclopedia
Amomum chevalieri
Systematics
Order : Gingery (Zingiberales)
Family : Ginger family (Zingiberaceae)
Subfamily : Alpinioideae
Tribe : Alpinieae
Genre : Amomum
Type : Amomum chevalieri
Scientific name
Amomum chevalieri
Gagnep. ex Lamxay

Amomum chevalieri is a species of the genus Amomum withinthe ginger family (Zingiberaceae). It is believed to be found in northern and central Vietnam , but was last collected in 1923.

description

Vegetative characteristics

Amomum chevalieri grows as a perennial , herbaceous plant that can reach heights of about 0.5 meters. The rhizomes are about 1 centimeter thick, hairless and covered with scales on the outside. Stilt roots about 5 centimeters long and 0.5 to 0.7 centimeters thick are formed. The paper-like, hairless scales fall off after a short time. The rhizome is only briefly between the individual "pseudostems". Several clump-forming shoot axes or “pseudostems” go from each rhizome . At the approximately 1 centimeter thick base, the stems have hairless and grooved leaf sheaths . The leathery and egg-shaped ligules are hairless on the outside and are about 0.5 centimeters long; their upper end is trimmed and the edges are ciliate.

Each stem has about seven leaves . These are divided into petiole and leaf blade. The rutty petiole is bare and is cylindrical in shape with a length of 10 to 15, rarely up to 20 centimeters and a thickness of around 0.3 centimeters. The simple leaf blade is elliptical with a length of 20 to 35, rarely up to 60 centimeters and a width of 5 to 10 centimeters wide with a wedge-shaped leaf base and pointed and ciliate upper end. The dark green upper side of the leaf is bare just like the gray underside of the leaf. The leaf blades show a conspicuous leaf veins on the underside. The leaf margins are entire.

Generative characteristics

Near or directly at the stem base from the rhizome develops long and thick 0.3 to 0.5 centimeters, grooved and hairless inflorescence stem is an elongated, with a length of about 10 centimeters and a diameter of 2 to 3 centimeters on an approximately 20 cm Inflorescence in which the flowers are close together. One inflorescence is formed per stem. The inflorescence stem is covered with leathery, grooved and externally hairless scales with a pointed upper end, which can be shaped differently. The scales at the base of the shaft are triangular with a length of about 1 centimeter and a width of about 1.5 centimeters, while in the upper shaft area they are lanceolate and elongated and about 3 centimeters long and 1 centimeter wide. The outside hairless, grooved and leathery bracts are lanceolate-elongated with a length of around 2.5 to 3 centimeters and a width of 1 to 1.2 centimeters with a pointed upper end and ciliate edges. Each of the bracts bears several flowers. The membrane-like, grooved and bald, about 1 to 1.5 centimeters long and about 0.7 centimeters wide, almost lanceolate bracts are not fused into a tube and have a pointed upper end and ciliate edges.

The hermaphrodite flowers are zygomorphic and threefold with double perianth . The three membrane-like sepals are tubular together over a length of around 1 centimeter and are approximately the same length as the corolla tube with a length of about 1.5 to centimeters and a width of about 0.5 centimeters. They are triple-toothed, the calyx teeth are around 0.5 to 0.75 inches long and have a hairless outside. The three membrane-like and bare petals are fused into a corolla tube about the same length and about 0.4 centimeters wide. There are also three membrane-like corolla lobes. The central lobe is the same size and has the same shape as the two lateral lobes, which are elongated with a length of around 1.5 centimeters and a width of around 0.8 centimeters. Only the middle of the stamens of the inner circle is fertile . The fertile stamen has a flattened, about 1 centimeter long, bare stamen . The two halves of the hairless anthers are oblong with a length of about 1 centimeter. The staminodes of the inner circle have grown together to form a labellum . The approximately 1.5 centimeters long and 1 to 1.3 centimeters wide, bald labellum has a rounded tip. The lateral staminodes are around 0.3 centimeters long. Three carpels are a dreikammerigen bare and grooved ovary adherent, which is about 0.4 centimeters long and is about 0.3 centimeters wide. Each ovary chamber contains several ovules . The stylus is hairless and ends in a cup-shaped scar with ciliated tip.

Several capsule fruits are formed, which stand on a 1 to 1.5 centimeter long and 0.2 to 0.3 centimeter thick stem. The winged capsule fruits have a spherical shape with a diameter of around 1 centimeter.

Occurrence

The natural range of Amomum chevalieri is in northern and central Vietnam . The exact range is not known, as the species was last collected in 1923. As far as is known, there are probably deposits in the Ba Vì mountain range north of Hanoi and in the provinces of Nghệ An , Phú Thọ and Quảng Nam . Although botanists have frequently visited these areas in the past, there have been no other known sightings of the species, but no specific search has yet been carried out.

The species thrives at altitudes of around 1500 meters in the lowlands in evergreen mountain forests.

Taxonomy

The first description as Amomum chevalieri was in 2012 by Vichith Lamxay in Edinburgh Journal of Botany , Volume 69, Number 1, Page 119 on the basis of four herbarium specimens collected between 1888 and 1923 . One of the herbarium specimens has already been given the species name that is valid today by François Gagnepain , but Gagnepain did not publish a valid first description.

Hazard and protection

Amomum chevalieri is in the red list of the IUCN classified in no danger level due to the insufficient data available.

swell

  • Vichith Lamxay, MF Newman: A revision of Amomum (Zingiberaceae) in Camboida, Laos and Vietnam . In: Edinburgh Journal of Botany . tape 69 , no. 1 . Trustees of the Royal Botanic Garden Edinburgh, 2012, p. 99-206 , doi : 10.1017 / S0960428611000436 .

Individual evidence

  1. ↑ a b c d e f g h Vichith Lamxay, MF Newman: A revision of Amomum (Zingiberaceae) in Camboida, Laos and Vietnam . In: Edinburgh Journal of Botany . tape 69 , no. 1 . Trustees of the Royal Botanic Garden Edinburgh, 2012, p. 99-206 , doi : 10.1017 / S0960428611000436 .
  2. ↑ a b c Amomum chevalieri in the endangered Red List species the IUCN 2017 Posted by: J. Leong-Skornickova, HD Tran, M. Newman, V. & S. Lamxay Bouamanivong, 2011. Accessed April 27, 2018th

Web links