Indotristicha ramosissima (Wight) P. Royen, Acta Bot. Neerl. 8: 475 1959. (Syn: Dalzellia ramosissima Wight; Lawia ramosissima (Wight) Kuntze; Terniola ramosissima (Wight) Wedd.; Tristicha ramosissima (Wight) Willis; Tulasnea ramosissima Wight);
India as per Catalogue of Life;   

It is an endemic species, distributed in the states of Karnataka, Kerala, Maharashtra and Tamil Nadu. Yadav and Sardesai (2002) considered it as a rare species of Kolhapur District in Maharashtra as they were able to collect it from only one place (Rangana, Chikkewadi). It is a widespread species, sometimes very abundant in rivers.

Annual or sometimes perennial in deep permanent water; it is usually found in the larger rivers (Cook 1996).
Citation: Arisdason, W. 2013. Indotristicha ramosissima. The IUCN Red List of Threatened Species. Version 2014.3. <>. Downloaded on 03 January 2015

Stem free floating, branched herbs, to 60 cm long, attached to rock by base, stem with 1.5-2.5 cm long ramuli and scale leaves. Flowers 1-6 mm long, axillary along the stem; pedicels 1-2.5 cm long, slender, erect. Perianth 3, free, 2 mm long, ovate. Stamens 3. Ovary 2.5 mm long, ellipsoid, stigma 3-lobed.
Flowering and fruiting: January-March
Southern Western Ghats (Endemic)
(Attributions- Dr. N Sasidharan (Dr. B P Pal Fellow), Kerala Forest Research Institute, Peechi



Fwd: Regarding Indotristicha ramosissima : 12 posts by 2 authors. 4 images- around 5 mb each.

I had some doubts regarding the identification of Indotristicha ramosissima here.
As per the species description (genus keydescription) Indotristicha is filiform, free floating and attached to rocks. The plate diagram also shows the morphology. Please refer to the attached document on Podostemaceae in Kerala by Mathew and Satheesh, 1997 pg 247. 
The images here have zygomorphic flowers and so cannot be Indotristicha ramosissima. The same error in ID seems to have been validated at FOI as well.
Please find attached, images of Indotristicha ramosissima from rivers (Kumaradhara) in Dakshin Kannada. Would be curious to know what others think. Please let me know. 
Attachments (1) – Podostemaceae Kerala mathew1997.pdf

yes it seems different

Perotis indica. a grass species. 

Thanks, … But actually that is not correct.

OK. I was doubtful about this !

Thanks for the responses. I am still unclear why the identification is disputed. The description in the cited literature seems to match.  

Thanks, … Sorry. In fact, I confused myself totally. Thanks for clarifying the matter.

Indotristicha ramosissima in FOI : 2 posts by 2 authors.

Pl. correct.

Don’t have much idea about this. But again, cannot see any similarity in the images of Indotristicha ramosissima here and the attached image from the paper.