Ceropegia bosseri
| Ceropegia bosseri | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Systematics | ||||||||||||
|
||||||||||||
| Scientific name | ||||||||||||
| Ceropegia bosseri | ||||||||||||
| Werner Rauh & Günther Buchloh |
Ceropegia bosseri is a species of the subfamily of the silk plants (Asclepiadoideae).
features
Vegetative characteristics
Ceropegia bosseri is a perennial, sprout succulent, creeping-prostrate to ascending growing plant. The shoots formed in the flowering phase are also twining. The brown to gray-green, sparsely branched shoots (of the non-flowering phase) are flattened, 1 to 4 cm thick and sharp, 4-edged. The greatest thickness is found in the area of the nodes. They have blackish-purple, rough warts, and the petiole bases are 10 to 15 mm horizontally extended and strongly succulent. On new shoots, the petiole bases are initially horizontal, on older shoots they are curved backwards like a hook. The dark green, succulent leaves have no stems. The opposite leaf blades are ovate to lanceolate, and 8 to 12 cm long and 7 to 10 mm wide. The edges of the leaf blades are covered with short white eyelash hairs and are often wavy. The apex ends mostly spiky. The extended petiole bases are rutted on the upper side and often covered with stipules. With the onset of the flowering phase, the internodes of the shoots lengthen considerably (often several meters!) And begin to twist. The leaves are reduced to small scales on these shoots.
Inflorescence and flowers
The short-stalked, umbel-like inflorescence contains one to six flowers that only develop on strongly elongated, twisting shoots. They bloom one by one. The 4 to 10 mm long inflorescence stalks are fleshy and growing horizontally; they measure 3 to 5 mm in diameter. The flower stalks are about 1 cm long. The sepals are subpulate and 2 mm long. The hermaphrodite flowers are zygomorphic and five-fold with a double flower envelope. The sepals are fused in the lower part to form a corolla tube, which is significantly longer than the corolla lobes. Basally, the tube is swollen (crown basin). The slightly curved corolla is 3.2 to 4.5 cm long; it is light green to yellowish and occasionally has red spots and stripes. The crown cup is 10 to 12 mm long and 9 mm wide. It is very abruptly set horizontally from the actual corolla tube or even slightly dented. There are clear longitudinal depressions on the outside. Inside it is provided with wine-red dots standing in long rows, and especially on the nerves with rigid, white hairs pointing downwards. The actual crown tube has a diameter of 3 mm at the base (= transition to the crown cup). Apically it widens like a funnel to 12 to 15 mm. The petal lobes are 12 to 22 mm long, slender-triangular and turned back along the midrib. The tips are inwardly curved and grown together apically, thus forming a conical, cage-like structure. At the base, the folded back leaves of the tips form inside the flower keels, which run down like a channel on the outside of the funnel-like extension. At the base and the following half of the length, the petal tips are pale green, in the upper half deep dark brown. The edges are covered with flexible, purple-colored hair that is 2 to 3 mm long. The flat, bowl-shaped, greenish-white secondary crown has a short stalk and measures 3 mm in diameter and 3.5 mm in height. The tips of the interstaminal (outer) secondary crown are cut in the middle very deeply to the edge of the secondary crown. The two awl extensions (per tip) stand upright and are 2 mm long and are each in contact with one another at the tip. They are pale yellow and bald. The tips of the staminal (inner) secondary crown are elongated-tongue-shaped and 2 mm long and 0.3 mm wide. They stand upright and bend together, the tips touching. The pollinia are egg-shaped, 400 µm long and 250 µm wide. After the fruit ripens, the shoots with the greatly elongated, twisting internodes die off completely, except for the succulent bases.
Similar species
Ceropegia bosseri differs from Ceropegia petignatii by the longer corolla lobes and the stalked gynostegium. According to Ulli Meve, both species could belong to one organic species .
Geographical distribution and ecology
So far, the species has only been found in the mountains around Ihosy (southern Madagascar ) at 1,500 meters above sea level.
Taxonomy
The taxon was first described by Werner Rauh and Günther Buchloh. The holotype is in the herbarium under no.10.668. According to Ulli Meve, the variety Ceropegia bosseri var. Razafindratsirana Rauh & Buchloh (1989), which Rauh upgraded to an independent species ( Ceropegia razafindratsirana (Rauh & Buchloh) Rauh) in 1989 , is a younger synonym . Also Ceropegia adrienneae Rauh & Gerold (1998) was of Meve in the synonymy of Ceropegia bosseri asked. The species is recognized as a valid taxon by the Ceropegia Checklist.
The species is named in honor of Jean Marie Bosser , who left a specimen of the species to the first authors.
literature
- Ulrich Meve: Ceropegia . In: Focke Albers, Ulrich Meve (Hrsg.): Succulents Lexicon Volume 3 Asclepiadaceae (silk plants) . Pp. 61-107, Eugen Ulmer Verlag, Stuttgart 2002. ISBN 3-8001-3982-0 , p. 68.
Individual evidence
- ↑ Werner Rauh, Günther Buchloh: Remarkable succulents from Madagascar. 18. Ceropegia bosseri Rauh et Buchloh, another new species from Madagascar. Cacti and Other Succulents, 16 (12): 226-229, 1965.
- ↑ Werner Rauh, Günther Buchloh: Ceropegia bosseri Rauh et Buchloh var. Razafindratsirana Rauh et Buchloh. Cacti and Other Succulents, 40 (5): 124-130, 1989
- ↑ 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, under Ceropegia lawii p. 98.