Acriopsis
Acriopsis liliifolia ( as a synonym Acriopsis javanica )
The plant genus Acriopsis from the orchid family (Orchidaceae) consists of eight species that are widespread in the tropics of Southeast Asia. They grow as epiphytes. It is characteristic that two bracts are fused together.
Description
The species of the genus Acriopsis grow sympodial. The shoot axes are to be rounded or onion-shaped, thickened closely spaced pseudobulbs, which consist of several internodes. The roots are thin and surrounded by velamen. They form a branched mass of aerial roots that catch falling leaves and the like. At the top of the pseudobulbs sit two to four true leaves. They are arranged in two rows, stiff molded upstanding and linear. The leaf base includes the shoot axis, it is offset by a separating tissues of the leaf blade.
The inflorescence appears laterally from the base of the pseudobulbs. The flower stalk is thin, erect to over the side, unbranched to sparsely branched. The resupinierten flowers bloom in succession and each hold only a few days. They are brown, brown - red, white or green. The two lateral sepals are completely fused together and are, looking to the flower from the front, behind the labellum. All except the lip petals are about the same shaped and colored. The lip is deformed in its lower part with the column into a tube, the free part bends downwards and is three-lobed or unlobed. The column is characterized by two small protruding appendages in the front area. The stamen sits at the end of the column under a hood. It contains two pollinia, which are connected by a pedicel with a viscid ( Viscidium ). Each pollinium is deeply grooved and strongly compressed laterally. The scar consists of an oval face.
The chromosome number is 2n = 40
Dissemination
The genus Acriopsis is widespread in tropical Asia. In the northwest of the range of India is populated by the South China reaches spreading across Indo-China and the Indonesian archipelago to New Guinea and reached with a kind of the northeast of Australia.
There are growing epiphytic plants that grow in the lower trunk.
Systematics and botanical history
Acriopsis was described by Blume 1825 with the kind Acriopsis javanica (now a synonym of Acriopsis liliifolia ). The name Acriopsis means " resembling a grasshopper ", which refers Genaust according to the appearance of brownish flowers, after "Australian orchid genera " specifically to the appearance of the column.
Within the tribe Cymbidieae Dressler puts it in its own subtribe Acriopsidinae. A previously assumed relationship with Thecostele he is not confirmed, arranges the genus, however, near the subtribe Cyrtopodiinae one.
The following types are distinguished:
- Acriopsis carrii Holttum
- Acriopsis densiflora Lindl. Acriopsis densiflora var borneensis ( Ridl. ) Minderh. & De Vogel
- Acriopsis liliifolia var auriculata ( Minderh. & de Vogel) JJWood