Ceropegia cordiloba
| Ceropegia cordiloba | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Systematics | ||||||||||||
|
||||||||||||
| Scientific name | ||||||||||||
| Ceropegia cordiloba | ||||||||||||
| Werderm. |
Ceropegia cordiloba is a species of the subfamily of the silk plants (Asclepiadoideae). It only occurs in Tanzania .
description
Appearance and leaf
Ceropegia cordiloba is a perennial , herbaceous plant. As a perennial organ, a bulbous root tuber with a height of about 50 mm and a diameter of about 40 mm, slightly narrowed at the side, is formed, which sits about 3 mm deep in the earth. The climbing, up to 1.5 meters long, twisting shoot axes are coarse hairy and slightly purple. The leaves are divided into a petiole and a leaf blade. The petiole is 15 to 38 mm long. The leaf blades are ovate with a length of 60 to 70 mm and a width of 30 to 55 mm with a heart-shaped base and a pointed outer end. The top and bottom of the leaf is hairy with fine downy hairs, the leaf margins are entire, rarely ciliated and finely ciliated.
Inflorescence and flower
In the sessile inflorescence there are 2 to 20 flowers in dense clusters. The flowers open in pairs or one after the other and usually several flowers are open at the same time. The flower stalk is 6 to 20 mm long.
The hermaphroditic flowers are zygomorphic and have a five-fold double flower envelope . The five pale yellow-green and sparsely hairy sepals are linear-needle-shaped with a length of about 2 mm and a width of about 0.5 mm with pointed and splayed ends. The corolla is 2 to 2.2 cm long. The five petals are fused into a very slightly curved, slender, outside largely bare, 15 to 17 mm long corolla tube ( sympetalie ), which takes up almost three quarters of the total length of the corolla. The lower third of the corolla tube is inflated to the so-called "coronet" with a length of about 6 mm and a diameter of 5 to 6 mm almost spherically. The actual corolla tube quickly decreases to 1.5 to 2 mm in diameter above the "crown bowl" and widens in a funnel shape to the mouth of the corolla or the corolla tube to 6 to 8 mm. The outside of the corolla tube shows a greenish basic color, with whitish green shadows on the "crown bowl" and purple-colored vertical stripes that shine through from the inside. In the area of the mouth of the flower, the outside is pale green. The inside of the mouth is yellowish green. The petal lobes are 6 to 8 mm long and 3 mm wide, the tips are connected to each other. The plate (lamina, surface of the petal tip) of the tip is hardly bent back. The outer parts of the lamina are yellowish green and bare, the inner parts near the keel and the base are sparsely hairy white. The tips form an elongated, cage-like structure with an umbrella-shaped top, which only leaves open slot-like inlets into the interior of the flower. It becomes increasingly darker green towards the top. The whitish-translucent secondary crown has only a short stalk, is 2.8 mm long (high) and 2.3 mm wide. It is deeply fused cup-shaped at the base. The five lobes of the interstaminal outer corolla are not divided and are each flat with serrated purple tinted edges. The purple-colored tips of the staminal inner secondary crown are linear, upright and sloping together. They reach about the height of the cup rim of the outer secondary crown. The stamens are almost square and rise above the flattened to rounded stylus head . The yellowish pollinia measure 0.36 mm × 0.16 mm. The corpusculum is dark brown, linear-elliptical and measures 0.12 mm × 0.05 mm.
Fruit and seeds
Fruits and seeds are not yet known
Occurrence
Ceropegia cordiloba is only known from two localities in Tanzania : Ludewa district near the Mudunda mission station in the Njombe region in the Livingstone Mountains and 9.5 km northwest of Miyau and in the Kiteza Forest Reserve near Songea in the Mbinga district. It thrives in the scrubland with secondary forest and in bush vegetation that emerges after bushfires at altitudes of 15 to 2200 meters.
Taxonomy
The first description of Ceropegia cordiloba was made in 1939 by Erich Werdermann in revision of the East African species of the genus Ceropegia. in the journal Botanical Yearbooks for Systematics, Plant History and Plant Geography , Volume 70, p. 209. Herbert Huber , however, only understood the taxon as a variety Ceropegia papillata var. cordiloba of Ceropegia papillata ; the later authors followed this view. Masinde in Goyder et al. In 2012, however, the taxon re-established as an independent species due to the differences in the corolla and the corolla.
supporting documents
literature
- Henk J. Beentje (Eds.), David Goyder, Timothy Harris, Siro Masinde, Ulrich Meve, Johan Venter: Flora of Tropical East Africa, Apocynaceae (Part 2). Royal Botanic Gardens, Kew, 2012, pp. 115-530, ISBN 978-1-84246-396-3 ( Ceropegia cordiloba pp. 235-236).
Individual evidence
- ↑ Erich Werdermann: Revision of the East African species of the genus Ceropegia. In: Botanical Yearbooks for Systematics, Plant History and Plant Geography , Volume 70, 1939, pp. 189–232, Leipzig (p. 209)
- ^ Herbert Franz Josef Huber: Revision of the genus Ceropegia. In: Memórias da Sociedade Broteriana , Volume 12, 1957, pp. 1–203, Coimbra (description of Ceropegia papillata var. Cordiloba, p. 152)
- ^ Walter Bally: Flowering Plants of Africa. A Magazine Containing Colored Figures with Descriptions of the Flowering Plants Indigenous in Africa. Volume 43, parts 3 and 4, 1976, plate 1716.
- ↑ Ulrich Meve: Ceropegia Checklist. A guide to alternative names used in recent Ceropegia classification. In: Dennis de Kock, Ulrich Meve: A Checklist of Brachystelma, Ceropegia and the genera of the Stapeliads. International Asclepiad Society 2007, pp. 83-113.