Rotala rotundifolia

Rotala rotundifolia (Buch.-Ham. ex Roxb.) Koehne, Bot. Jahrb. Syst. 1(2): 175 175 1880. (syn. (≡) Ammannia rotundifolia Buch.-Ham. ex Roxb.);
 
Roundleaf toothcup, Dwarf rotala • Manipuri: ইশিঙ কুংদো Ishing kundo, লৌবুক লৈৰী Loubuk leiri;
 

Erect herbs, to 15 cm high; stem reddish, 4-angled. Leaves to 8 x 6 mm, oblong-orbicular, sessile, glabrous, 5-nerved. Racemes 1-1.5 cm long, bracteoles 2 mm long, lanceolate; calyx tube 2.5 mm long, lobes triangular, acute; intersepalar appendages absent; petals 1.5 x 1 mm, obovate; filaments attached near the base of calyx tube; ovary 1 x 1 mm, obovoid, truncate, obtuse, 4-angled; style 1 mm long.
Flowering and fruiting: September-March
Along streams and marshy areas in grasslands
South and South East Asia and also in Japan
 

The emerse form has rounded leaves, the submerse leaves are narrow lanceolate. It is very variable dependent on light and environmental conditions. Under strong light the leaves can become almost wine red. Pale pink flowers.
This plant can be differentiated from the closely related R. indica by the differences in the two species' inflorescences. R. rotundifolia bears groups of terminal inflorescence while R. indica has solitary flowers on the axis of the leaves. 
A common weed in rice paddies and wet places 
A common aquarium plant. Undemanding but likes a lot of light to thrive. Can withstand relatively cool temperatures. Losing its lower leaves usually means it is not receiving enough light. Can be grown emerse in shallow water where it will flower. Forms a good clump under reasonable conditions.
Propagated by cuttings which form as side shoots. 
India, China, Formosa, Thailand, Laos and Vietnam - introduced to the United States
(From  Wikipedia on 27.11.13)


https://08511630493324166816.googlegroups.com/attach/d752d5f3b69e34d6/3.__Unknown_herb_-_Leaf_IMG_5329.jpg?part=0.3&view=1&vt=ANaJVrFcrft6Yuc1oStRhrSgW2cS9IaD8eBnI0UfC5_7JdRXRN8roKlkivHErolIHEEhbBmiqr336fqNJ05x5MalEbS1f5OEyLt4T6UYZCT86qDTzTc32b4
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https://08511630493324166816.googlegroups.com/attach/d752d5f3b69e34d6/5.__Unknown_herb_-_Flower_IMG_5335.jpg?part=0.5&view=1&vt=ANaJVrGGcDCKx0eLOEJW1nShAUjkI0RO0NvkUM2y-nhGU8LzT6haRK4cnck2bTt8NwEJBaCPuzcv-In0nVvgp1Sq4NooZYsETq2rz3x5f2LP1qL1m2JbJYM
https://08511630493324166816.googlegroups.com/attach/d752d5f3b69e34d6/1._Unknown_herb_-_Habit_IMG_5328.jpg?part=0.1&view=1&vt=ANaJVrHEHxJEVkiEZaf4fzIWPAdOOVcO-q7GurGFevLncqUN27h6opW_HnHwOkCcgAl-yI-ut2s0BAG9pjX4UnfpFkkSJNWqs8mT4sRQxIGDq5Y27zEanyA
 
https://08511630493324166816.googlegroups.com/attach/d752d5f3b69e34d6/2.__Unknown_herb_IMG_5332.jpg?part=0.2&view=1&vt=ANaJVrHhIknIWyJzoQaVvU5ZgPVKOZvxx7EVGxkvV8gx6dAa4MJ5vva25UYxez8XbSsaljP9oT7nLJe5r9Jjoy60jYIFx3ktQBVRgJsho2jYZs6aAiMekKo
Unknown herb-3 from Assam-Jan.2014 :  6 posts by 4 authors. Attachments (5).
Attached images are unknown aquatic herb from Assam. Please ID the plant.  
Date :30.12.2013
Location: Assam
Family : ?
Genus & species :??
Habitat: Grows wild on ditches, rice field
Habit :Aquatic herb     
Rotala rosea
I'm guessing R. rotundifolia because of the shape of leaves and flowers in terminal spikes. I don't know the plant from the field.
The attached figure from Assam is of Rotala rotundifolia (Buch.-Ha.. ex Roxb.) Koehne
Basionym: Ammannia rotundifolia Buch.-Ham. ex Roxb.
It seems like R. rotundifolia or allied taxa. For correct identity complete botanical description is needed.


https://08511630493324166816.googlegroups.com/attach/185e1343190eecfd/Rotala%20rotundifolia.JPG?part=0.1&view=1&vt=ANaJVrE7bptl1QbXVvBvC-jAPxMhpT86w5u7lL-Ast7Xtd-fLoR4MS5e5PiJ6hVhP0kQFp02I3NTUF4pGaRO_u6vPGhCJ9pDa6eP_BtpYzwmkCdpLK9EdoY
 
Rotala rotundifolia (Buch.-Ham. ex Roxb.) Koehne SN April09 : Attachments (1). 1 post by 1 author.
Rotala rotundifolia (Buch.-Ham. ex Roxb.) Koehne, Fam Lythraceae,
small herb found in the Nilgiri area of Tamilnadu.


 https://08511630493324166816.googlegroups.com/attach/46350a984af26737/Copy%20of%20Manas%20NP%20295.jpg?part=0.1&view=1&vt=ANaJVrG-SM8aKXjoesXi6yp_XDHVav-RpQnCcil4DZItNIjDf0NNI0As15BK6-Kv1inozEAoeEg-EaxkmyUgaF1IBBP_PsLxZS1ARYwAixPGcTyvRhgLvzw
Flower for id -ID08042014SH2 :  8 posts by 6 authors. Attachments (1).
Flower for Id pl.
Location -Manas National Park,Guwahati.
Date- 05.03.2014

Habitat -Wild
May be Polygonum.
Looks like some Bistota sp.
Not Polygonum.....Looks more like a Rotala sp. (Lythraceae). Please check with R. rotundifolia.
Some links for comparison:

 https://08511630493324166816.googlegroups.com/attach/34506014166b3a04/Sp%2017.JPG?part=0.1&view=1&vt=ANaJVrEp3RgPLgii4vUEw-vTDztPt_gMRrrVQ9deHCjWMBk9sifOdSduBDD9plymruUnODlt9H8HqPCA32DFPtXYP9aw58Z9mKAMOt5TjLthUTxkUA4N5qA 
Annual herb, collected from Madhya Pradesh for Id : 6 posts by 2 authors. Attachments (1)- 2 MB.
ID Please
Annual herb, collected from Madhya Pradesh on 25.02.15.
This should be a Rotala sp.
Rotala species in eFloraofindia (with details/ keys from published papers/ regional floras/ FRLHT/ FOI/ Biotik/ efloras/ books etc., where ever available) 
Details are not clear, pl. post close ups & bigger pixel size photos to see the details for proper Id. 
Please find enclosed herewith the another photographs of this species. Attachments (1)- 1 MB
The specimen likely to be Rotala rotundifolia
It is Rotala rotundifolia


 
https://08511630493324166816.googlegroups.com/attach/811fc240cf794/DSC_1120.JPG?part=0.2&view=1&vt=ANaJVrG7gJU4ImeXqvARzz49IQkih7pyLWLLTDYZW6798Pg7G78mJN4hNflIydXB3nX5l0GGmKm-xx2l3M4cXoEqHWbynGKc-b6TaHFo0riiPbb3lyMM4vA
https://08511630493324166816.googlegroups.com/attach/811fc240cf794/DSC_1116.JPG?part=0.1&view=1&vt=ANaJVrEun9P_kcPcj7LxFmSmQ5hs_A-KCcyJe7bvTuTaJn-Qs2f1gnBZd6Ej4c0injalccD0SznC5ra0TH99-dkU-m3VAFkOC7my-Zf8pkSrpMx3M_DpS6A
https://08511630493324166816.googlegroups.com/attach/195a71a8f4cf4/DSC_0072.JPG?part=0.1&view=1&vt=ANaJVrGcRA3zYf476R5yjL9KaQjnATl2yTb8R3TGFLUz9aUcNRcXOHASWTyx6a5DiNqO5Zj-PS1vZ0Hv21a6HTQukuXdzbNBWVkY8FJD6MLsFfmdzcJWbLA
https://08511630493324166816.googlegroups.com/attach/195a71a8f4cf4/DSC_0073.JPG?part=0.2&view=1&vt=ANaJVrEmJOeKJrO8mvX0pZ2gh93mxqQVmTxOO2yqfa0z9ThaP5comybil5Amho15EvsdUfqiSpk8bQLVhKX1R_jBFrBT9I_srVOTNvSH1dJ1jwgkSauB1to
https://08511630493324166816.googlegroups.com/attach/195a71a8f4cf4/DSC_0074.JPG?part=0.3&view=1&vt=ANaJVrF9Dv72Z_MLHl0NPtHou0OPujSeebzsROM4N01LX2Q3QYcENXvjRceusWMbleVyI3HQCnCpE7nq5z6tq_U_byVSCmIHZRkrWLnB7BVr-fU0i7edU7c
Rotala rotundifolia (Buch.-Ham. ex Roxb.) Koehne (accepted name) : 2 posts by 2 authors. Attachments (4)
Location: Kakani, Nepal 
Altitude: 6000 ft.
Date: 8 April 2014
Nepali name : सिम झार  Sim Jhaar 
Location: Nagdaha, Kathmandu, Nepal 
Date : 14 April 2013
Altitude : 4500 ft.
Attachments (2)


https://08511630493324166816.googlegroups.com/attach/830bc59ff2e3e/IMG_0834a.JPG?part=0.5&view=1&vt=ANaJVrFQmzmS7GTr3RdNNqNtIwNv0Py9exxs-VFeJZ5X16bkCugdd_IhY7j3nln2EyKwEbcvsxdECBVRehLdF_s9K_wVzbR9PM57vKO8oTeQhGImQV9h6SQ
https://08511630493324166816.googlegroups.com/attach/830bc59ff2e3e/IMG_0835.JPG?part=0.6&view=1&vt=ANaJVrE1XuMcV4QSKvQ6Yz643Rk7XG7_I8wR0OXkAdZ0fIXDFldqb6SKLnFortixXe2iwFPV3WLGLkvkm77wkJ0grFqUPq_D1ioKJfbqigl6N4yRAVeR00U
https://08511630493324166816.googlegroups.com/attach/830bc59ff2e3e/IMG_0834.JPG?part=0.4&view=1&vt=ANaJVrHs3DpP1FaZgSS86YNO1w4BjiwJwCloBH-6JAZ5pSV41fi0ET6g5tB8nQh9NQggypMecy0hFsfhBXX1kk4E5j7VxjOj_UNct-WuTE-r3iGm-P5vP5c
 
https://08511630493324166816.googlegroups.com/attach/830bc59ff2e3e/IMG_0832.JPG?part=0.3&view=1&vt=ANaJVrEov0Pg3dnStCrWW1D9kNlicd4IWXRGr0XJSqcpuKSzGu53ABLOUIwENWaGUSIUeB_PAPH3LgOBu3odOwEYDIMgP4mxZ9D4S3T0d_Ng9Ro4rSJ5KkM
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Small aquatic plant for ID :: Thane :: ARKDEC16 : 5 posts by 2 authors. Attachments (6)
This aquatic plant was seen in a cultivated garden in Thane in December 2016.
Can this be Rotala rotundifolia? Requested to validate the ID.
Thanks, ... Appears close as per images in Unknown herb-3 from Assam-Jan.2014
The photographs are all belongs to the species Rotala rotundifolia (Butch.-Ham. ex Roxb.) Koehne, of the family Lythraceae, a species found allover India.

https://08511630493324166816.googlegroups.com/attach/26b945e9f40b15fd/Mbaleshwar%20photo%203.jpg?part=0.3&view=1&vt=ANaJVrFDezKpA9Cuuu53qoKtSHaKUUN4mDPwj1v0puI_SLr8nXj5iOOQE2J8iTM9KNSuJZFMET_olzQ6iGwIud-iImWMQOKbauvZSVcY13sCNML5jF4BfT8
 
Plant ID: Would it be possible to identify the plant in the attached pix. These were shot off Mahabaleshwar in the Sahayadris last week and seemed to be growing in marshy areas near waterfalls or streams.
seems to me a Rotala sp..
But further details - leaves , image of whole plant are required to ascertain the id.
Appears closer to images at Rotala rotundifolia (Buch.-Ham. ex Roxb.) Koehne as per comparative images at  ‎Rotala
  
 
https://lh6.googleusercontent.com/proxy/g4rZOkyFFTVee8Vi9WqW23Shf0z_ZThDXGakoayH5utJHi1Y96Owdu61hMpRnCIg0VFECbbpT597sIlxUzaW8sEHeIVC-K8MXcZfQ9Gg-Tnd2Q=w5000-h5000
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Dattaji Salvi Udyan  Thane
Date: May 1, 2018 ... Altitude: about 11 m (36 feet) asl
Rotala rotundifolia  (Buch.-Ham. ex Roxb.) Koeh
https://08511630493324166816.googlegroups.com/attach/5be1eca0fa736/DSC_0844.JPG?part=0.4&view=1&vt=ANaJVrEr7MlFFG5AQnKSCaSjq1zxdLlNY6UBpgagAHLXmHf3oCKCaqyts1Fh-1Vsks8-bgy7JhrpkiHXBgsIkdHB_xvANB6XSSM_fEfLzHE6f-SxQVUZMj4
 
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https://08511630493324166816.googlegroups.com/attach/5be1eca0fa736/DSC_0843.JPG?part=0.5&view=1&vt=ANaJVrHMfrsTS3O6vCu5ed3Oa6m8u9MFqY0Y3-7PCyzWFgf-dv4lhTBINBg-YDJpLRKdIi_9sAJOUgN6FJpe60uKEvL1fS8DEq72MPZcbKwsPuf-82Ahcic
https://08511630493324166816.googlegroups.com/attach/5be1eca0fa736/DSC_0849.JPG?part=0.3&view=1&vt=ANaJVrGK9dAfNc1mETT_NLIm-5BwcKl5DrINbwHeGcszEzeTBt4r72T_SK4BEyHN_uXcg6OYFcJGQW0BRV-BqsaIX3SKN65PJtZLCIDIpIyzneeyp6EBELU
https://08511630493324166816.googlegroups.com/attach/5be1eca0fa736/DSC_0846.JPG?part=0.2&view=1&vt=ANaJVrE2hEpYZEWHVr-bYJpTzXRGn7e67SAtpQ644g5IEDNUvB1tEPFOhVziHIsNlXnZmoO8SXSOp83d4bNiGWUbFJcptYz8_tJc7oQI40DnUfgYU3YFyLY
https://08511630493324166816.googlegroups.com/attach/5be1eca0fa736/DSC_0847.JPG?part=0.1&view=1&vt=ANaJVrEQPT-xEfJktUKgEZKz6RSNWJEZknxmzf_3tprr5pVHlfl3eGUXgA2VsHFeS8xjAn9k64zAGQeOEQsnwqz7m4359DddJiQygdldsAdT7httKpAUdTU
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Rotala rotundifolia (Buch.-Ham. ex Roxb.) Koehne : 1 post by 1 author. Attachments (8)- around 700 kb each.
Location: Pame, Pokhara, Kaski Dt.
Date: 21 March 2019
Elevation: 794 m.
Habit : Wild

 
 
https://08511630493324166816.googlegroups.com/attach/247afbc10e234/Manas%20NP%20276.jpg?part=0.1&view=1&vt=ANaJVrFUYbjZ40_dpHc8kZhDwPAoX4B2Akk3YI4m0Rhy5S2Y0axfebPBqDVdCvUmY1QQs30CirMYbW5vtGdwPgKQReMWVoubz9QfCyaUfaw-aQNWTEDMf6U
Id of Flower - ID30072020 SH1 : 4 posts by 3 authors. Attachments (1)- 960 kb. 
Flower for id pl.
Location -Kokilabari, Manas (Assam)
Date - March 2014

I think Rotanda rotundifolia. I have one more old image.
I too concur with …
Thanks, … Yes, Rotala rotundifolia as per comparative images at Rotala
 


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