Amomum agastyamalayanum
| Amomum agastyamalayanum | ||||||||||||
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| Amomum agastyamalayanum | ||||||||||||
| VPThomas & M.Sabu |
Amomum agastyamalayanum is a species of the genus Amomum withinthe ginger family (Zingiberaceae). It occurs in southern India.
description
Vegetative characteristics
Amomum agastyamalayanum grows as a perennial , herbaceous plant that can reach heights of 0.9 to 1.7 meters. The slender, runners-forming rhizomes are between 0.5 and 1.2 centimeters thick, are creamy white on the inside and covered with scales on the outside. The paper-like and hairless scales are triangular in shape and have ciliate edges and a pointed to rounded tip. From each rhizome there are several slender shoot axes . At the base, the stems have hairless, dark green leaf sheaths with thin-skinned edges, which are about 2.5 centimeters wide. The entire, leathery, green-colored and pink-red speckled ligules are hairless and 0.3 to 0.5 centimeters long; their upper end is rounded and their edges are ciliate.
Each stem has 8 to 23 leaves. The alternate leaves are arranged in a petiole and a leaf blade. The green and hairless petiole is 0 to 0.2 inches long. The simple leaf blade is 22 to 33 centimeters long and 3.5 to 4.5 centimeters wide and lanceolate with a wedge-shaped leaf base and a pointed upper end. The dark green upper side of the leaf is hairless, as is the pale green underside of the leaf. The leaves have a flat leaf vein on the upper side. The leaf margins are as bare as the midrib.
Generative characteristics
The flowering period as well as the fruit ripeness of Amomum agastyamalayanum covers the months February to July. Underground and directly from the rhizome, an inflorescence develops on a 4 to 17 centimeter long inflorescence stem , which is 7 to 23 centimeters long and 1.5 to 2 centimeters wide and in which the numerous flowers are close together. The pale green and pink-red speckled as well as fluffy hairy on the outside, leathery bracts are obovate to obovate-oblong with a length of 1.2 to 1.7 centimeters and a width of 0.5 to 0.9 centimeters upper end and ciliate edges. The pale green and pink speckled, membrane-like bracts are fused together to form a tube 0.9 to 1.2 centimeters long and 0.2 to 0.3 centimeters wide, which is doubly lobed. The two lobes are covered with downy hair on the outside.
The hermaphrodite, yellow flowers are 1.8 to 2 centimeters long and zygomorphic and triple with double perianth . The two or three fluffy hairy, pale green and pink-red speckled sepals are fused together in a tubular shape and are 0.9 to 1 centimeter in length and 0.25 to 0.3 centimeters in width longer than the corolla tube. All sepals have a sharply pointed upper end. The pale yellow petals are fused into a 0.8 to 0.9 centimeter long and about 0.2 centimeter wide corolla tube with three also pale yellow corolla lobes that are downy on the outside and shaggy hairy on the inside at the tube opening. The middle, bald on the inside, corolla lobe is about 1.1 centimeters long and about 0.5 centimeters wide and is obscured-lanceolate with a sharply pointed and concealed upper end. The two lateral corolla lobes, which are hairless on the inside, are narrower and oblong with a length of around 1 centimeter and a width of around 0.3 centimeters. Only the middle of the 0.7 to 0.9 cm long stamens of the inner circle is fertile ; it has a 0.2 to 0.3 centimeter long and about 0.1 centimeter wide, downy hairy, pale yellow stamen . The two creamy-white halves of the downy, hairy anthers are elongated with a length of 0.35 to 0.4 centimeters. Three of the staminodes of the inner circle have grown together to form a pale yellow obovate labellum with a dark colored center, which is 1.3 to 1.6 centimeters long and 1.2 to 1.4 centimeters wide. The labellum has an entire margin and is downy hairy on the inside near the base. The lateral, hairless, yellow staminodes are awl-shaped and are about 0.1 centimeters long. Three fruit leaves are long a dreikammerigen and about 0.4 centimeters and about 0.3 centimeters wide, fluffy hairy ovary grown, with numerous ovules in each ovary chamber. The stylus is about 1.5 centimeters long and hairy. The cup-shaped scar has a diameter of around 0.5 millimeters.
Each inflorescence can form three to seven capsule fruits , which are located in an 8 to 14 centimeter long infructescence, which stands on a 6 to 10 centimeter long stem. With a length of 1.1 to 2 centimeters and a thickness of 1.1 to 1.6 centimeters, the approximately spherical to spherical capsule fruits are red to reddish brown in color when ripe. They have a prickly surface and contain many seeds. The black angular seeds are 4 to 5 millimeters long, 3 to 4 millimeters wide and have a white aril . They give off a fragrant smell.
Occurrence
The natural range of Amomum agastyamalayanum is in the state of Kerala in southern India . As far as is known so far, it includes the Agastyamalai Mountains in the Thiruvananthapuram district , part of the Western Ghats . It is found there at altitudes of 900 to 1300 meters, where it grows in evergreen forests.
Taxonomy
It was first described as Amomum agastyamalayanum in 2012 by VP Thomas and Mamiyil Sabu in the Edinburgh Journal of Botany , Volume 69, Number 2, Page 313. The specific epithet agastyamalayanum refers to the location of the type material, the Agastyamalai.
swell
- VP Thomas & M. Sabu: Two new species of Amomum (Zingiberaceae) from Western Ghats, India . In: Edinburgh Journal of Botany . tape 69 , no. 2 . Trustees of the Royal Botanic Garden Edinburgh, 2012, p. 313-321 , doi : 10.1017 / S0960428612000133 .