Orbea schweinfurthii
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Orbea schweinfurthii |
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| ( A. Berger ) Bruyns |
Orbea schweinfurthii is a species of plant from the subfamily of the asclepiadoideae (Asclepiadoideae). The home is in Tanzania , Rwanda , Zaire , Zambia and Zimbabwe .
description
Vegetative characteristics
Orbea schweinfurthii grows as a flat lawn-forming, perennial succulent plant . The mostly prostrate, basal slightly tapered, stem succulent shoot axes are about 8 to 10 cm long / high and four to five ribs in cross section. The 0.8 to 1.5 cm long warts are protruding to slightly ascending. The small leaves are slightly upwardly curved with minor leaf rudiments .
Generative characteristics
The inflorescence formed at the upper end of the stem axis contains two to five upright flowers. The prophylls are lanceolate-triangular with a length of about 2.5 mm and a width of about 1.5 mm. The flower stalk has a length of about 3 to 4 mm and a diameter of about 1.5 mm.
The hermaphrodite flowers are five-fold and radial symmetry with a double flower envelope . The five sepals are 2 to 3 mm long and 1 to 1.2 mm wide. The corolla is spread out flat with a diameter of 1 to 1.5 centimeters. The corolla-tube is very flat and surrounded by a broad, thick-fleshed annulus.
The lanceolate corolla lobes are 6 to 12 mm long and about 10 mm wide, triangular-oval and convex inward (above). The upper ends of the petal lobes are pointed and slightly curved outwards. The inside surface of the petal lobes is more or less densely warty-papilla. The corolla is green on the outside with a few red spots, yellow to brown on the inside and with irregular, wine-red, beige or purple stripes or spots, mostly transverse to the longitudinal axis of the petal tips.
The secondary crown measures 4 to 5.5 mm in diameter and is surrounded by the base of the crown, but protrudes over it. The interstaminal lobes of the corolla are cream-colored with fine red dots. They are flat, bowl-shaped, the tips measure approx. 1 mm. The staminal minor corolla lobes are approximately triangular and measure 1 mm in height and 0.7 mm in width. They tower above the anthers . The upper edge is blunt or bidentate. They are grown flat with the interstaminal lobes of the corolla. In the free part of the staminal corolla lobes there are occasionally two lateral depressions. The D-shaped pollinia measure 0.3 × 0.3 mm.
Occurrence
Orbea schweinfurthii occurs from Tanzania, via Rwanda to Zaire. The distribution area extends in the south to Zambia and Zimbabwe .
Synecology
In contrast to most other species of the genus Orbea , Orbea schweinfurthii is not pollinated by carrion flies, but by small drosophilid flies. The flowers give off a scent that smells like an overripe orange or pineapple. Draft flies feed on fermenting plant substances and also lay their eggs there. Orbea schweinfurthii simulates a source of food and a suitable place to lay eggs ("flies deceit"). The pollinia are particularly small, so that they can be torn loose and transported even by small flies.
Systematics
The first description was made of this kind in 1910 by Alwin Berger under the name of Caralluma schweinfurthii . It was regrouped by Michael George Gilbert in the genus Pachycymbium . Darrel CH Plowes placed it under the name Orbea schweinfurthii in the genus Angolluma . Peter Vincent Bruyns then transferred it to the genus Orbea .
supporting documents
Individual evidence
- ^ AK Shukla, MR Vijayaraghavan and B. Chaudhry: Biology of pollen. 133 pp., New Delhi, SB Nangia for APH Pub., 1998 ISBN 81-7024-924-4
- ^ A b Peter Vincent Bruyns: New combinations in the genus Orbea. In: Aloe , Volume 37 (4), 2001, pp. 72-76.
- ↑ Peter V. Bruyns: Monograph of Orbea and Ballyanthus (Apocynaceae - Asclepiadoideae - Ceropegieae). In: Systematic Botany Monographs , 63, 2002, American Society of Plant Taxonomists, Ann Arbor, ISBN 0-912861-63-0 online at JSTOR.
- ↑ Alwin Berger: Stapelieen and Kleinien including some other related succulents Description and instructions for determining the important species with brief information about the culture. 433 pp., Stuttgart, Ulmer, 1910
- ↑ Michael George Gilbert: A review of Caralluma R. Br. And its segregates. In: Bradleya , Vol. 8, 1990, pp. 1-32
- ↑ Darrel CH Plowes: The taxonomy of the genera Pachycymbium Leach and Angolluma Munster (Stapelieae: Asclepiadaceae). In: Excelsa , Volume 16, 1994, pp. 103-123.
literature
- Birgit Müller, Janine Kiel, Focke Albers and Ulrich Meve: Orbea . In: Focke Albers and Ulli Meve (eds.): Succulent lexicon Volume 3 Asclepiadaceae (silk plants) . Pp. 189-208, Ulmer, Stuttgart 2002, ISBN 978-3-8001-3982-8 . (Description of Orbea schweinfurthii on p. 202)
Web links
- Flower photo at the professional association for other succulents.