Rotala rosea (Poiret) C. D. K. Cook ex H. Hara, Enum. Fl. Pl. Nepal. 2: 173. 1979. (Syn: Ammannia rosea Poiret, Encycl., Suppl. 1: 329. 1810; A. leptopetala Blume; A. littorea Miquel; A. pentandra Roxburgh; Rotala leptopetala (Blume) Koehne; R. littorea (Miquel) Nakai; R. pentandra (Roxburgh) Blatter & Hallberg.) as per Flora of China ;

Amphibious or marshy annuals; stem erect or creeping, simple or branched, to 20 cm tall. Leaves decussate, 8 – 20 x 3 – 6 mm, linear-lanceolate to ovate, cuneate to obtuse at the base, apex acute or obtuse. Flowers monomorphic, sessile, solitary in the axils of the bractiform leaves. Bracteoles 0.5-1 mm long, linear or filiform, not exceeding the calyx tube. Calyx tube c. 1.5 mm long, campanulate; lobes 5, minute, triangular, the alternating appendages subulate, equalling the lobes. Petals 5, pink, c. 0.5 mm long, obovate. Stamens 5, included, inserted just below the middle of calyx tube. Ovary globose; stigma capitate. Capsule c. 2 mm across, globose, 3-valved, exceeding the calyx. Seeds sub-ovoid, brownish.

Flowering and fruiting: August-February
Along streams and marshy areas in grasslands
Indo-Malesia and East Asia

 

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Is this Rotala rosea? : Attachments (2). 4 posts by 2 authors.
This herb was seen in a very wet place at Matheran on 9th July 2013.
Is is Rotala rosea?


Rotala species with some keys   


Yes it is Rotala rosea


Thank you so much …, thanks to your expert identifications I am getting a clearer idea of the Rotala species.


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Rotala sp for ID-200811-PKA1: 9 posts by 5 authors. Attachments (5).
 Seen this Rotala sp. at CBD Hills.
Date/Time: 20-08-2011 / 10:00AM
Location: CBD Hills, Navi Mumbai
Habitat: Wild
Plant Habit: Herb

May be R. rosea. I photographed it from Kashmir rice fields a few days back.



I always thought this one was R. densiflora. It should have 5 calyx lobes and I can’t quite see in these pics. We should wait for … to see these Rotala spp.


It is seemingly Rotala rosea. Please confirm if the flower is pentamerous, five sepal lobes, five small petals in between the sepal lobes and five stamens.


It is something related to R. rosea. Provide details for correct identification.


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Rotala Sp?? : 3 posts by 2 authors. Attachments (1)

Help me in identification of  this herb.
Location: panvel
Date: 16-08-09


Appears more closer to images at Rotala rosea (Poiret) C. D. K. Cook ex H. Hara as per comparative images at ‎Rotala


 

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Plants from Assam KD Dec 2018 : 4 posts by 3 authors. Attachments (4)- 1 mb or more. 
Attached images are Rotala sp. Pl. Id the sp. 
Date :15.12..2018
Location: Assam

Family : Lythraceae 
Genus & species : Rotala sp.
Habitat: Grows wild on paddy field
Habit :  Herb
 

Ammannia baccifera?? 


To me appears close to Rotala rosea (Poiret) C. D. K. Cook ex H. Hara as per comparative images at Rotala
Looks different from images at Ammannia baccifera L.


 

 

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Rotala sp.——for id : 5 posts by 5 authors. Attachments (3)
Please help in Id. of this plant in water logged area. I can relate it to R. densiflora. confirmation needed. Pics taken at Aambyvalley Rd., Off lonavala, pune in september 17.

Ammannia baccifera L. ?? 


No …; Rotala only.


I think close to Rotala rosea (Poiret) C. D. K. Cook ex H. Hara as per comparative images at Rotala

Yes looks like it. thanks


References:

A New Species of Rotala L. (Lythraceae) from Kerala by K. Subrahmanya Prasad and K. Raveendran (Keys of 25 species found in India of which 15 are endemic to Paninsular India 

Flora of China  Tropicos  Annotated checklist of Flowering plants of Nepal  India Biodiversity Portal  

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