Fimbristylis tetragona R.Br., Prodr. Fl. Nov. Holl. 226 1810. (Syn: Fimbristylis abjiciens Steud.; Fimbristylis arnottii Thwaites; Fimbristylis cylindrocarpa Kunth; Fimbristylis oxyrhachis Miq.; Fimbristylis xyrioides Arn. ex Thwaites; Iria tetragona (R.Br.) Kuntze; Mischospora efoliata Boeckeler; Scirpus tetragonus (R.Br.) Poir. [Invalid]; Trichelostylis xyroides Arn. ex Hook.f.);
Erect, tufted herbs, 15-30 cm tall; culms quadrangular, glabrous. Leaves reduced to bladeless sheaths; sheath laterally compressed, 1-3 cm long, keeled, straw-coloured, mouth oblique; ligule absent. Inflorescence a single terminal spikelet; bract absent. Spikelet 7-9 x 4-5 mm, ovoid-obtuse, brown; rachilla narrowly winged. Glumes spiral, 3-3.5 x 1.5-2 mm, obovate-obtuse, many-nerved, with yellowish hyaline margins, 2-3 basal ones empty. Stamen 1; anther 1-1.5 mm long. Style c. 1.5 mm long, flat, linear, slightly broader at base, sparsely ciliate on margins; stigmas 2, c. 0.5 mm long. Nut 1-5.2 x 0.5 mm, oblong, biconvex, subcylindric, yellowish, stipitate, trabeculate with 7-9 rows of cells on each face.
Flowering and fruiting: October-December
Wet and moist paddy fields
Wetland :: Sedge for identification :: 11032014MK :: March002 : 8 posts by 3 authors. Attachments (4).
Please help me in identifying the Cyperaceae sedge. Is a species of Fimbristylis?
Height: about 15 cm
Date: 07 March 2014
Place: Ariyalur dist., TN
Altitude: c. 52 m asl
Habitat: wetland, marsh
At first look it looks like Xyris indica.
it doesn’t look like a Cyperaceae member
I think it is Fimbristylis tetragonoloba
Are you talking of Fimbristylis tetragona R.Br. as I could not find any match of Fimbristylis tetragonoloba on google search & not even in The Plant List.
Fimbristylis tetragona R. Br., not F. tetragonoloba
here is the attachmentt of Fimbristylis tetragona R. Br., Nut and spikelets
Requesting to please ID this sedge captured at a garden in Thane in Mar 2015.
I think Eleocharis atropurpurea
Thanks … for the ID… I did not find any other entry for E. atropurpurea in the eFI database.
Hoping to receive validation of the same….
It looks like Fimbristylis tetragona
In Cyperaceae Nuts play an Important role for the Identification…
Here are the nuts of Eleocharis atropurpurea and Fimbristylis tetragona it will help for the identification of your plant..
Thank you … for the nut photos. Will check for the nuts, on my next visit…