Upuna borneensis
| Upuna borneensis | ||||||||||||
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Upuna borneensis |
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| Systematics | ||||||||||||
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| Scientific name of the genus | ||||||||||||
| Upuna | ||||||||||||
| Sym. | ||||||||||||
| Scientific name of the species | ||||||||||||
| Upuna borneensis | ||||||||||||
| Sym. |
Upuna borneensis is an endemic tree in the wing fruit family from Borneo . It is the only species in the genus Upuna .
description
Upuna borneensis grows as a tree up to 55 meters high. The trunk diameter reaches up to 190 centimeters. Larger buttress roots are formed. The brown-gray bark is cracked and flakes off in small flakes. The branches are densely hairy.
The simple, soft-leather and short-stalked leaves are alternate. They are entire, about 10–22 centimeters long, 4–9 centimeters wide and ovate to oblong, elliptical or obovate and pointed to tail. The petiole is 1–3 inches long. They are pale green and whitish hairy on the underside, the leaf base is wedge-shaped to rounded or slightly heart-shaped. The veins are pinnate and raised on the underside and have brownish hairs. The sub- leaves are quite durable.
Glandular and densely brownish hairy, richly branched, zymous inflorescences are formed at the branch ends. There are support and cover sheets available. The reddish to dark purple, hermaphrodite and fragrant, small flowers are five-fold with a double flower envelope . The almost free sepals are hairy and uneven. The broad, egg-shaped petals have a yellow border. There are 25–30 stamens with flattened stamens at the base. The anthers have a long filamentous appendage at the tip. The hairy one. multilocular ovary is continuously connected to an upper, hairy in the lower part stylus with a three-piece, small and capitate scar .
Solitary wing nuts with enlarged, winged, initially reddish, later brownish sepals and stylus remains are formed. Two wings are larger and up to 13 inches long and three are smaller and up to 7.5 inches long. The brownish hairy, ellipsoidal, somewhat triangular and pointed, beaked nut without wings is about 3–3.2 centimeters long. The nuts open loculicidal three-lobed during germination. The seeds have a thin arillode .
Taxonomy
The first description of the genus Upuna and the species Upuna borneensis was made in 1941 by Colin Fraser Symington in Bull. Jard. Bot. Buitenzorg, Ser. 3, 17:88.
use
The hard and very heavy wood is very durable.
literature
- K. Kubitzki , C. Bayer: The Families and Genera of Vascular Plants. Vol. V: Flowering Plants Dicotyledons , Springer, 2003, ISBN 978-3-642-07680-0 , pp. 184 f, 191, 193.
- K. Ogata, T. Fujii, H. Abe, P. Baas, Identification of the Timbers of Southeast Asia and the Western Pacific. Kaiseisha Press, 2008, p. 80 f.
Web links
- Upuna at PROTA.
- Upuna borneensis in Flora Malesiana (illustration).
- The Plants in Malaysia Upuna borneensis (pictures; Japanese).