Larsenianthus arunachalensis
| Larsenianthus arunachalensis | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
Larsenianthus arunachalensis |
||||||||||||
| Systematics | ||||||||||||
|
||||||||||||
| Scientific name | ||||||||||||
| Larsenianthus arunachalensis | ||||||||||||
| M. Sabu , Sanoj & Rajesh Kumar |
Larsenianthus arunachalensis is a species ofthe ginger family (Zingiberaceae). It was first described in 2010 and is native to northeastern India.
description
Vegetative characteristics
Larsenianthus arunachalensis grows as an evergreen , perennial herbaceous plant that can reach heights of up to 1.5 meters. The hard, fibrous rhizomes give off a light scent, are up to 1.9 centimeters thick and have a pale brown colored interior. Larsenianthus arunachalensis does not form tubers . The upright, leafy stems have a diameter of 2.5 to 3 centimeters and two leaves at their base.
At the base the stems have four to six red and green colored leaf sheaths , which are slightly hairy towards the tip. With a length of 9.5 to 14 centimeters and a width of 2.4 to 2.7 centimeters, the ligule- shaped ligules are hairy on their underside. They dry out over time and then turn brown. The leaves are divided into a petiole and a leaf blade. The green and hairy petiole becomes 19.5 to 31 centimeters long and has a U-shaped cross section. The simple leaf blade is 56 to 88 centimeters long and 19 to 25 centimeters wide and elliptical with a pointed and slightly twisted upper end. The slightly white colored leaf margins are whole and wavy. The dark green upper side of the leaf is bare. The dull green underside of the leaf is slightly hairy in silver and has raised leaf veins.
Generative characteristics
The inflorescence grows upright at the tip of leafy stems and can reach a total length of up to 90 centimeters. The upper part of the inflorescence stem is pale green, hairy, between 25 and 75 centimeters long and about 1.2 centimeters thick. The annual inflorescence has a height of 14 to 19 centimeters and a diameter of 3 to 3.4 centimeters. 60 to 80, dark red, white at the base bracts are formed per inflorescence, with a length of 2.4 to 2.9 centimeters and a width of 2.6 to 2.8 centimeters spherical to broadly elliptical, boat-shaped are. They are leathery, hairy, entire and the tip is densely covered with brown hair. There are two to four flowers above each bract, with two to eight flowers of the inflorescence usually opening at the same time. The tubular bracts are between 2.8 and 3.3 inches long, are dark red in color and have a white base. On one side they are cut about 1 centimeter deep. Their upper end is pointed or rounded and is densely covered with short, brown hair.
The showy flowers are hermaphroditic and threefold. The three membranous, translucent sepals are fused together to form a calyx tube, which is 1.6 to 1.7 centimeters long and about 0.3 centimeters in diameter and is white in the lower area, otherwise light red. The calyx tube is cut 5 to 6 millimeters deep on one side and is hairy, with the hair becoming thicker towards the tip. There are three calyx lobes. The red petals are fused into a corolla tube, which has a length of 3.2 to 3.3 centimeters and a diameter of about 3.5 millimeters at the top. The three corolla lobes are obsolete-lanceolate with a length of 1.5 to 1.7 centimeters. The upper corolla lobe is slightly downy on the inside with single-celled, branched trichomes hairy and bent back. The two lateral corolla lobes are hairless. The white and pale red tinted lateral staminodes are circular to broadly elliptical and curved back with a length of about 4 millimeters and a diameter of about 3.5 millimeters. The labellum, which is orange-yellow at the pointed, beak-like upper end and red to creamy yellow towards the base, is 2.5 to 2.8 centimeters long and 2.5 to 3 millimeters wide and is narrowly elongated in the lower two thirds and in the upper third inverted-lanceolate, almost spatulate overall. The fertile stamens , arched like a fish hook, have stamens 2.4 to 2.6 centimeters long, which are colored red in the lower part and creamy yellow in the upper part. The creamy yellow, bald anthers are about 3 millimeters long and about 2 millimeters wide. Three carpels have grown together to form a three- chamber ovary, which has a length of about 3 millimeters and a diameter of about 2.5 millimeters and is tomentose and light red. There are two white, epigyne glands that are elongated 2.5 to 3 millimeters in length. The white scar is about 0.5 mm in diameter, bulbous with ciliate edges.
The authors of the first description are not aware of the fruits and seeds.
Occurrence
Larsenianthus arunachalensis is known from the location of the type specimen at Lohit , near Lalpani , in the state of Arunachal Pradesh in northeast India . It thrives at altitudes of over 1400 meters on sandy soils . One finds Larsenianthus arunachalensis in dense stands of wild occurring banana ( Musa spp.).
Taxonomy
It was first described as Larsenianthus arunachalensis in 2010 by Mamiyil Sabu , E. Sanoj and T. Rajesh Kumar in PhytoKeys number 1, page 28. The specific epithet arunachalensis refers to the Indian state of Arunachal Pradesh , in which the type material was found.
swell
- W. John Kress, John D. Mood, Mamiyil Sabu, Linda M. Prince, Santanu Dey, E. Sanoj: Larsenianthus, a new Asian genus of Gingers (Zingiberaceae) with four species . In: PhytoKeys . No. 1 , 2010, ISSN 1314-2003 , p. 28-31 , doi : 10.3897 / phytokeys.1.658 .
Individual evidence
- ↑ a b c d e f g W. John Kress, John D. Mood, Mamiyil Sabu, Linda M. Prince, Santanu Dey, E. Sanoj: Larsenianthus, a new Asian genus of Gingers (Zingiberaceae) with four species . In: PhytoKeys . No. 1 , 2010, ISSN 1314-2003 , p. 28-31 , doi : 10.3897 / phytokeys.1.658 .
