Larsenianthus
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Inflorescence of Larsenianthus careyanus |
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| Scientific name | ||||||||||||
| Larsenianthus | ||||||||||||
| WJKress & Mood |
Larsenianthus is a plant genus newly established in 2010inthe ginger family (Zingiberaceae). The four or so species are native to the adjacent areas of the eastern Himalayas .
description
The Larsenianthus species grow as evergreen, perennial herbaceous plants that can reach heights of 1 to 2.5 meters. They stand in groups of ten to twenty plants and form rhizomes . Depending on the species, the plants have two to twelve alternately arranged, sessile or stalked leaves .
The inflorescences stand on leafed inflorescence shafts or at the base of leafless side shoots. Depending on the type, 35 to 80 curved or flat, scale-like bracts are connected to the inflorescence at the base and are arranged in a spiral. At the base of the inflorescence, additional side shoots can sometimes occur with sterile bracts. The bracts are of different sizes with the inner ones being larger. The conspicuous flowers are rarely solitary, usually in twos or six in a wrap . The lower flowers always open first.
The tubular, triple-toothed sepals are smaller than the petals . The long, tubular petals are curved and have a rectangular opening. On two sides the edge of the flower is thickened and rounded by the base of the staminodes and the labellum . The side standing, small staminodes are bowl-shaped. The elongated, spade- or inverted-lanceolate labellum is broad at the tip and becomes narrower towards the leaf base. The labellum base is V-shaped in cross section or has a raised center, its edges are thickened. The edge of the labellum tip can be toothed. The long, fertile stamens are curved over the labellum and have elongated anthers . Three carpels have grown together to form a three- chamber ovary.
The elongated capsule fruits contain a number of seeds in each half of the capsule, which are divided into three separate fruit compartments. The one to ten seeds are surrounded by a fleshy shell ( aril ).
habitat
They grow in the South Asian tropics mainly in forest areas.
Systematics and distribution
The first description of the genus Larsenianthus was made in 2010 by Walter John Emil Kress and John Donald Mood in phytokeys , No. 1, pp. 21, (23). The type species is Larsenianthus careyanus (Benth.) WJKress & Mood , which was previously assigned to the genus Hitchenia . The genus name Larsenianthus honors Kai Larsen (1926–2012) from the University of Aarhus in Denmark, an expert in the systematics of the Zingiberaceae . Anthus is the Greek word for flower.
The genus Larsenianthus belongs to the tribe Zingibereae in the subfamily Zingiberoideae within the family Zingiberaceae .
The natural range of the Larsenianthus species includes northeastern Bangladesh , northeastern India and northern Myanmar .
There are four species of Larsenianthus :
- Larsenianthus arunachalensis M.Sabu, Sanoj & T.Rajesh Kumar : It occurs from the Indian state of Arunachal Pradesh to northern Myanmar.
- Larsenianthus assamensis S.Dey, Mood, & S.Choudhury : It occurs only in the Indian state of Assam .
- Larsenianthus careyanus (Benth.) WJKress & Mood : It occurs in northeastern Bangladesh , Assam, Myanmar and in the eastern Himalayas.
- Larsenianthus wardianus W.J. Kress, Thet Htun & Bordelon : It occurs in northern Myanmar .
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. 15-32 , doi : 10.3897 / phytokeys.1.658 .
Individual evidence
- ↑ a b c d e f 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. 15-32 , doi : 10.3897 / phytokeys.1.658 .
- ↑ a b c d Rafaël Govaerts (Ed.): Larsenianthus. In: World Checklist of Selected Plant Families (WCSP) - The Board of Trustees of the Royal Botanic Gardens, Kew . Retrieved August 13, 2018.
