Amomum newmanii
| Amomum newmanii | ||||||||||||
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| Amomum newmanii | ||||||||||||
| M.Sabu & VPThomas |
Amomum newmanii is a species of the genus Amomum withinthe ginger family (Zingiberaceae). It occurs in southern India.
description
Vegetative characteristics
Amomum newmanii grows as a perennial , herbaceous plant that can reach heights of 1 to 2 meters. The strong and stiff rhizomes do not form runners, are about 1.5 centimeters thick, are creamy white on the inside and covered with scales on the outside. The papery and hairless scales have ciliate edges. From each rhizome several strong, tuft-like arranged shoot axes go off. At the base the stems have a green leaf sheath with fluffy hairs on the outside with ciliate edges and a round upper end, which are about 2 centimeters wide. The entire, membrane-like, pale green ligule are downy hairy to bald on the outside, lanceolate in shape and 2.8 to 3.8 centimeters long; their upper end is rounded and their edges are ciliate.
Each stem has 20 to 30 leaves. The alternate leaves are sessile. The simple leaf blade is 22 to 37 centimeters long and 4 to 6.5 centimeters wide and lanceolate with a wedge-shaped leaf base and a pointed upper end. The dark green upper side of the leaf is just like the pale green underside of the leaf, with the exception of the fluffy, hairy leaf tip. The leaves have a flat leaf vein on the upper side. The leaf margins are bare just like the green midrib.
Generative characteristics
The flowering period as well as the fruit ripeness of Amomum newmanii covers the months February to July. Underground and directly from the rhizome, an inflorescence stem that is around 7.5 centimeters long and in which the numerous flowers stand close together develops on an approximately 2 centimeter long inflorescence stem . The reddish brown and on the outside fluffy hairy, paper-like cover sheets are obovate with a length of 1.7 to 2.3 centimeters and a width of 1.2 to 1.8 centimeters with a rounded upper end and ciliate edges. The white, membrane-like propsheets are fused to form a 1.5 to 1.7 centimeter long and 0.45 to 0.5 centimeter wide tube, which is two or three times lobed. The two or three lobes are covered with downy hair on the outside.
The hermaphrodite, pale yellow flowers are zygomorphic with a length of 5 to 5.5 centimeters and threefold with double perianth . The two or three white sepals with fluffy hair on the outside are fused together in a tubular shape and are 1.4 to 2 centimeters long and about 0.5 centimeters wide, shorter than the corolla tube. All sepals have a slightly ragged, ciliate upper end with a small tip. The pale yellow petals are fused into a 2.3 to 2.4 centimeter long and around 0.35 centimeter wide corolla tube with three also pale yellow corolla lobes, which are hairless on both the outside and the inside. The middle, pale yellow and pink speckled corolla lobes are egg-shaped with a length of 1.9 to 2 centimeters and a width of about 1.1 centimeters with a sharply pointed and concealed upper end. The two pale yellow lateral corolla lobes are 1.9 to 2 centimeters long and 0.5 to 0.55 centimeters wide, narrower, elongated and slightly folded at the tip. Only the middle of the 1.8 to 1.9 cm long stamens of the inner circle is fertile ; it has a 0.9 to 1.1 centimeter long and 0.25 to 0.3 centimeter wide, outside downy hairy, pale yellow stamen . The two creamy white halves of the downy, hairy anthers are elongated and have a length of 0.6 to 0.65 centimeters. Three of the staminodes of the inner circle have grown together to form a pale yellow obovate labellum with a dark yellow colored and red striped center, which is 2.5 to 2.9 centimeters long and 2 to 2.4 centimeters wide. The labellum has a wrinkled, wavy edge and is downy hairy on the inside near the opening. The lateral, downy hairy, at the base reddish staminodes are awl-shaped and about 0.3 centimeters long. Three carpels are long to a dreikammerigen and about 0.5 centimeters and 0.2 to 0.3 centimeters wide, fluffy hairy, inverted-cone-shaped ovary grown, with numerous ovules in each ovary chamber. The about 4 centimeters long stylus is hairy fluffy. The cup-shaped yellowish white scar has a diameter of around 1 millimeter.
Each inflorescence can form eight to twelve capsule fruits , which are located in a 15 to 17 centimeter long infructescence, which stands on a 11 to 14 centimeter long stalk. The spherical capsule fruits with a diameter of 2.2 to 2.5 centimeters are colored green when ripe. They have a prickly surface and contain many seeds. The brown square seeds are 2 to 3 millimeters long and have a white aril . They give off a fragrant smell.
Occurrence
The natural range of Amomum newmanii is in the southern Indian state of Kerala . As far as is known so far, it includes two locations on Agastya Malai , in the Thiruvananthapuram district . It can be found there at altitudes of more than 1000 meters, where it grows in evergreen forests.
Taxonomy
The first description as Amomum newmanii was made in 2012 by Mamiyil Sabu and VP Thomas in Edinburgh Journal of Botany , Volume 69, Number 2, Page 319. The specific epithet newmanii honors the British botanist Mark F. Newman from the Royal Botanic Garden Edinburgh , who is in the system the ginger family (Zingiberaceae) has earned.
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 .