Agrostophyllum
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Agrostophyllum philippinense |
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| Scientific name | ||||||||||||
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| flower |
The genus agrostophyllum from the family of the orchid (Orchidaceae) consists of 133 kinds . The plants usually grow epiphytically , they occur in tropical Asia.
description
The Agrostophyllum species have a creeping, occasionally branched rhizome , from which the individual shoots arise at short intervals . These are not thickened, they consist of numerous internodes and are densely covered in two rows with leaves . The leaves are oval to narrowly lanceolate in shape. The leaf base encompasses the shoot so that it is completely covered by the leaf bases; there is a separating tissue between the leaf base and blade. The terminal inflorescences consist of several, umbel-like approximated bunches . The individual grape comprises one to six flowers , the entire inflorescence usually contains many flowers, but in some species only a few or even a single flower. The mostly small flowers are white, cream-colored or yellowish, often with reddish markings. The outer three petals are broad, the petals are narrower. The lip is divided into two sections by a transverse elevation. The first, basal section (hypochil) is deepened in the shape of a bowl and often contains two calluses. The column bears the large, rounded, stigma and a fertile stamen. The stamen contains eight pollinia , which are connected by short stalks (caudiculae) with an adhesive disc (viscidium). Between the stigma and stamen there is an approximately triangular-shaped separating tissue (rostellum).
distribution
The species of the genus Agrostophyllum are common in tropical Asia. To the west they still reach the Seychelles and Madagascar, in the east the distribution area extends to Fiji , Samoa and Vanuatu . Most of the species come from New Guinea.
They are epiphytic, rarely lithophytic plants.
Here is a selection of the types:
- Agrostophyllum acuminatum Ormerod : It occurs in Papua New Guinea.
- Agrostophyllum boeeanum Ormerod : It occurs on Sumatra.
- Agrostophyllum carex Ormerod : It occurs in New Ireland in the Bismarck Archipelago.
- Agrostophyllum daymanense Ormerod : It occurs in Papua New Guinea.
- Agrostophyllum flexuosum Ormerod : With three subspecies that occur from Papua New Guinea to the Bismarck Archipelago.
- Agrostophyllum philippinense Ames : It occurs in the Philippines.
- Agrostophyllum stipulatum (Griff.) Schltr. : It occurs in two subspecies from Indochina and Malesia to the Solomon Islands.
Systematics and botanical history
The genus Agrostophyllum was established by Carl Ludwig Blume in 1825 . Dressler places them in a subtribe Glomerinae within the so-called Epidendreae II. He also places the genera Aglossorhyncha , Earina , Glomera , Glossorhyncha , Ischnocentrum and Sepalosiphon in this subtribe . He separates two other related genera, Adrorhizon and Sirhookera , as the subtribe Adrorhizinae. A study by van den Berg et al. has shown that the eponymous genus Glomera is not closely related to the other plants; In this study, Agrostophyllum is summarized together with Earina as Subtribus Agrostophyllinae.
literature
Most of the information in this article comes from:
- Jim B. Comber: Orchids of Java . Bentham-Moxon Trust, Kew 1990, ISBN 0-947643-21-4 , pp. 189-192 .
- Chen Xinqi, Zhu Guanghua, Ji Zhanhe, Lang Kaiyong, Luo Yibo, Phillip Cribb: Orchidaceae (draft) . In: Wu Zhengyi, Peter H. Raven (Ed.): Flora of China . Missouri Botanical Garden Press, St. Louis ( eFloras.org ( August 12, 2007 memento on the Internet Archive ) [accessed May 25, 2016]).
Individual evidence
- ↑ a b c d e f g h Rafaël Govaerts (Ed.): Agrostophyllum. In: World Checklist of Selected Plant Families (WCSP) - The Board of Trustees of the Royal Botanic Gardens, Kew . Retrieved April 4, 2020.
- ^ Robert L. Dressler: Phylogeny and Classification of the Orchid Family . Cambridge University Press, 1993, ISBN 0-521-45058-6 , pp. 196-197 .
- ^ Cássio van den Berg, Douglas H. Goldman, John V. Freudenstein, Alec M. Pridgeon, Kenneth M. Cameron, Mark W. Chase: An overview of the phylogenetic relationships within Epidendreae inferred from multiple DNA regions and recircumsription of Epidendreae and Arethuseae (Orchidaceae) . In: American Journal of Botany . tape 92 , no. 4 , 2005, p. 613-624 ( cassiovandenberg.com [PDF]). An overview of the phylogenetic relationships within Epidendreae inferred from multiple DNA regions and recircumsription of Epidendreae and Arethuseae (Orchidaceae) ( Memento of the original from November 16, 2016 in the Internet Archive ) Info: The archive link was automatically inserted and not yet checked. Please check the original and archive link according to the instructions and then remove this notice.
