November 2014


the old picture – Ceropegia rupicola

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c.rupicola.mfk

Ceropegia rupicola Deflers

Depiction from: ‘K. Schumann: Ceropegia rupicola Deflers. Monatsschrift für Kakteenkunde 9: 168-171. 1899’

http://www.biodiversitylibrary.org

Ceropegia zeyheri – or rather not?

This is a  plant, commonly sold as Ceropegia zeyheri, not only in Germany but also all over Europe – but it isn’t C. zeyheri!

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The leaves are much too large and actually not scale-like as they should be.

I made a dissection through one of the faded flowers of my plant and exposed its gynostegial corona to compare it to the material known to me (in fact just some drawings). They are indeed very distinct and do not resemble each other, the gynostegium is more like that of C. distincta and its allies, but in no way identical to that of the real C. zeyheri.

The shape of the flower is quite distinct from that of the true C. zeyheri – yet, it does not really match that of any other species known to me, the exterior is completey covered with fine hair, a feature, that is found very rarely in that way, for example in C. somalensis.

The inner surface of the lower third of the corolla is dark purple coloured, while in C. zeyheri the basal inflation of the flower has longitudinal, darkened lines on the inner surface.

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This plant may actually be a hybrid of C. zeyheri with perhaps C. distincta or even with C. somalensis!

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c.zeyheri.al

All photographs: Alexander Lang

c.sp.231114.1

c.sp.231114.2

Ceropegia talbotii S. Moore

Diese Art, die aus den feuchten Regenwäldern des tropischen Westafrikas stammt, wurde im Jahr 1913 wissenschaftlich beschrieben. [1]

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Es handelt sich um eine kräftige Liane, die etliche Meter lang wird und die nichtsukkulente, faserige Wurzeln besitzt (?).

Die Blätter sitzen an einem bis zu 3 cm langen Blattstiel, sie sind bis zu 6 cm lang und 3 cm breit, schmal oder breit eiförmig, mit leicht herzförmiger Basis und einer sehr lang ausgezogener Blattspitze.

Die Blüten erscheinen in wenigblütigen Cymen, die Pedunkel sind 1,5 bis 3 cm lang, die Blütenstiele sind 1 cm lang, die Kelchblätter sind auffällig verlängert, etwa 1,5 bis 2 cm lang, die Blüten selbst haben eine Länge von 3 bis 5 cm, sie sind sehr schlank, schmutzig weiß gefärbt und mit purpurnen Flecken verziert. [1]

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Die Art ist am nächsten mit Ceropegia johnsonii N. E. Br. verwandt, mit der sie zum Teil den selben Lebensraum teilt. [1]

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Die Pflanze wird in Nigeria Okorun genannt (vom Volk der Yoruba). [2]

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Ceropegia talbotii S. Moore

This species, which comes from the wet rainforests of the tropical West Africa, was scientifically described in the year 1913. [1]

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It is a vigorous liana, that can become several metres long and which has non-succulent, fibrous roots (?).

The leaves sit on a up to 3 cm long petiole, they are up to 6 cm long and 3 cm wide, narrowly or broad ovate in shape, with slightly cordate base and a very elongated leaf tip.

The flowers appear in few-flowered cymens, the peducles are 1,5 to 3 cm long, the pedicels are 1 cm long, the sepals are conspicuously elongated, reaching about 1,5 to 2 cm, the flowers themselves have a length of 3 to 5 cm, they are very slender, dirty white coloured and decorated with purple spots. [1]

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The species is most closely related to Ceropegia johnsonii N. E. Br., with which it partially shares the same habitat. [1]

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The plant is named Okorun in Nigeria (by the Yoruba tribe). [2]

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Referenzen / References:

[1] A. B. Rendle; E. G. Baker; H. F. Wernham; S. Moore et al.: Catalogue of the Plants collected by Mr. & Mrs. P. A. Talbot in the Oban District, South Nigeria. London: Printed by order of the Trustees of the British Museum 1913
[2] H. M. Burkill: The useful plants of west tropical Africa. Royal Botanic Gardens, Kew 1985-2004

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c.talbotii.al

Darstellung / Depiction: Alexander Lang