ID Request 151214SG

[Gopal Shinde]

Please help identify this weed spreading 1-1.5’.  Photo taken on 15Dec14 at Dhavlas, Maharashtra.

Gopal

[Nidhan Singh]

Oldenlandia corymbosa in my opinion..

[Tabish]

This is Oldenlandia pumila. Oldenlandia corymbosa flowers are carried on a long peduncle.

 http://www.flowersofindia.net/catalog/slides/Corymb%20Diamond%20Flower.html

There are some other misidentifications of Oldenlandia pumila on eFI.

   Tabish

[J.M. Garg]

I think it should be Oldenlandia corymbosa only as per keys at Aquatic and Semi-aquatic Plants of the Lower Ganga Delta, which is based on leaves:

Leaves elliptic, about 2 times as long as broad. for O.pumila and Leaves usually linear, about 4-10 times as long as broad in O.corymbosa.

Regarding inflorescences, For O.corymbosa, Flora of China says 'Inflorescence axillary, 1-flowered or usually cymose and 2-5-flowered, glabrous, pedunculate; peduncles 1(or 2) per axil, filiform, 1-16 mm; ...' (Flowers axillary, 1-4, rarely many. Peduncle 10-15 mm long, glabrous. Pedicel c. 4-5 mm long, enlarged in fruit as per Flora of Pakistan).

For O.pumila, IBP says 'Flowers axillary, opposite or alternate, solitary or in 2-flowered cymes; peduncle 0.7-1 cm long; pedicel 1-1.5 cm long'

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With regards,
J.M.Garg

[Tabish]

Garg ji,

   The flowers in the image are actually solitary in leaf axils. They deceptively look like in a corymb. In Oldenlandia corymbosa the corymb itself is carried on a peduncle. See the images on POWO to see how the corymbs in O. corymbosa look like.  Moreover, while Oldenlandia corymbosa is an erect plant, Oldenlandia pumila is by and large prostrate.

   Tabish

 

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www.flowersofindia.net
The waterhole of flower lovers

[J.M. Garg]

Hi, Tabish ji.

Pl. see the 1st specimen in the POWO link.

Here you see the flowers single in axils as well as on peduncle. 

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With regards,
J.M.Garg