Cynanchum viminale

Cynanchum viminale (L.) Bassi, Bononiensi Sci. Inst. Acad. Comment. 6(Opusc.):17. 1768 (syn: (=) Asclepias acida Roxb.; (≡) Asclepias viminalis (L.) Steud.; (≡) Euphorbia viminale L. (basionym); (=) Sarcostemma acidum (Roxb.) Voig; (≡) Sarcostemma viminale (L.) R. Br.) as per GRIN ;

 
Common name: Leafless East-Indian Vine • Hindi: सोमा Soma, सोमलता Somlata • Kannada: braahmi, hambu balli, hambu kalli • Sanskrit: सोमा Soma, सोमलता Somlata, सोमवल्ली Somavalli • Tamil: kodikkalli, somamum • Telugu: aaku jemudu, aku jemudu 
 
Stem cylindrical, 3-7 mm in diameter, green, glabrous, internodes 10-20 cm long. Flowers sweet-scented in sessile many-flowered terminal umbels. Pedicels 6-12 mm long, pubescent. Bracts minute, linear-lanceolate. Sepals 5, 1-1.5 mm long, subacute, margin membranous, glandular inside near the base. Corolla campanulate, pale greenish white, divided almost to the base, lobes c.5 mm long, ovate-oblong, subacute. Outer corona crenately 10-lobed, lobes of the inner corona thick, fleshy obtuse, longer than the staminal column and concealing the anther. Staminal column very short. Pollen-masses compressed, clavate. Follicles 10-13 cm x 8 mm, lanceolate, tapering at both ends, slightly diverging when 2 together. Seeds 3-6 mm long, flattened ovate. Coma 1.8 cm long.
Flowering and fruiting: August-May
Dry deciduous forests and scrub jungles
India and Myanmar
(From India Biodiversity Portal (Sarcostemma viminale (L.) R.Br.) 
Kotputli Forest Jaipur- 4.9.2009; Sarcostemma acidum - indiantreepix | Google Groups
 
 
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ID(dkb-15) : Attachments (1).  7 posts by 5 authors. 

Photo taken on-15.10.2009

It is a euphorbia climber.

At- Viratnagar(Jaipur)

... would this be the milk bush, pencil tree ... Euphorbia tirucalli ?
No it is climber.
It should be a species of Sarcostemma (viminale?) of Asclepiadaceae.
Sarcostemma viminale 
 
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Sarcostemma viminale : Attachments (5).  2 posts by 2 authors.
On 13/9/09 in a rocky area in Keesaragutta in Rangareddy distt. of A.P.
 
 
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image s for identification 05092013 :  Attachments (2).  3 posts by 3 authors.
sending images of euphorbia ?spp for identification
To me this looks similar to Sarcostemma acidum of Asclepiadaceae
efi page on Cynanchum viminale (L.) Bassi, Bononiensi Sci. Inst. Acad. Comment. 6(Opusc.):17. 1768 (syn: (=) Asclepias acida Roxb.; (≡) Asclepias viminalis (L.) Steud.; (≡) Euphorbia viminale L. (basionym); (=) Sarcostemma acidum (Roxb.) Voig; (≡) Sarcostemma viminale (L.) R. Br.)
 
 
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Sarcostemma acidum (Roxb.) Voigt 15Jan SN13 : 2 posts by 2 authors. Attachments (3).
Sarcostemma acidum (Roxb.) Voigt
wild succulent climber from Kanchepuram dt of Tamilnadu
Certainly looks to be from Asclepiadaceae...now Apocyanacaeae

 
  
 

References:

GRIN  The Plant List (Sarcostemma acidum (Roxb.) Voigt syn. Sarcostemma brevistigma Wight & Arn.);
Flora of China (Sarcostemma acidum (Roxburgh) Voigt syn. Sarcostemma brevistigma Wight & Arnott., Asclepias acida Roxburgh)
Flowers of India (Sarcostemma acidum (Roxburgh) Voigt) Flowers of India (Sarcostemma viminale (L.) R.Br.) 
India Biodiversity Portal (Sarcostemma viminale (L.) R.Br.) 
Biodiversity in India, Volume 4 edited by T. Pullaiah (Sarcostemma viminale (L.) R.Br.)  Wikipedia  Freedictionary  Indian medicinal plants: a ... - Google Books
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