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Cyperus distans L.f., Suppl. Pl. 103 1782. (syn: Cyperus densiflorus Hemsl. [Illegitimate]; Cyperus distans f. capillarioides Kük. ……..; Cyperus elatus Rottb. [Illegitimate]; Cyperus graminicolus Steud.; Cyperus kurrii Steud.; Cyperus laxus Vahl [Illegitimate]; Cyperus graminicolus Steud.; Cyperus kurrii Steud.; Cyperus laxus Vahl [Illegitimate]; Cyperus nutans Sieber ex C.Presl [Illegitimate]; Cyperus psilostachys Steud.; Cyperus purpureovaginatus Boeckeler; Cyperus schraderianus Mart. ex Steud.; Cyperus squamulatus Steud.);
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The key in Bengal Plants :-
i) mature spikelets patent; glumes obtuse ——— distans
ii) mature spikelets collapsing, tufted; glumes often minutely mucronate —— nutans
. Erect, rhizomatous perennials; rhizome short, knotty; culms solitary or few together, 27-80 cm tall, triquetrous, thickened at base. Leaves few, basal, 8-51 x 0.4-0.7 cm, linear, apex acuminate, scabrid on margins; sheaths 6-15 cm long, purple-brown. Inflorescence compound to decompound; leafy bracts 4-6, the lowest upto 42 cm long; rays 5-12, very unequal. Spike loose, broadly ovate-pyramidal, distantly bearing 8 to 20 spikelets. Spikelets 0.8-2.2 x 0.1 cm, linear, subterete; rachilla flexuous, winged. Glumes distantly disposed on weakly zig-zag rachilla, 1.5 – 2 x 1 mm, ovate-oblong, obtuse, margins white-hyaline. Stamens 3; anthers oblong. Stigmas 3. Nut c. 1.5 x 0.5 mm, oblong, trigonous, apiculate, dark brown, minutely puncticulate.
Flowering and fruiting: October-November
Along banks of streams, also in wastelands and roadsides
Pantropical
(From India Biodiversity Portal )
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Cyperus distans is pantropical and subtropical in distribution. In India it is found in Andamans, Andhra Pradesh, Assam, Jammu Kashmir, Madhya Padesh, Maharasthra, Karnataka, Kerala, Tamil Nadu, Megalaya, Manipur, Punjab, Sikkim, Uttar Pradesh and West Bengal.
It is found growing in wet places, edge of pools, ditches and streams, in rice fields and in wet grasslands. It is found growing in mats as floating vegetation in shallow waters. It grows as a weed on roadside and cultivated lands, from the plains to 2600 m.
(From IUCN Red List (LC) ) .             Hooghly Today : Cyperus sp. 02-06-2013 : Attachments (13 + 11). 6 posts by 2 authors.
This is about 2ft. or a bit tall cyperus, found on roadside. I didn’t have any scale with me. I think this cyperus, found yesterday, just above the waterline of a pond, is the same species as in my earlier upload in this thread. This time i have stats.
Culm height : 70 cm; triquetrous, each side 4mm wide, smooth angle, smooth surface
Leaves : about same length
Ray (?) : 15 cm avg,
Raylet (?) : 6 cm
Can it be Cyperus distans L. f. ? The following pictures (links) are what i think of C. distans L.f. –
At least the first set of photographs in this thread is also C. distans L.f.
Cyperus sp. collected from Kamrup district, Assam. : Attachments (5). 6 posts by 4 authors.
Attached images are Cyperus sp. collected from Kamrup district, Assam. Please ID the plant.
Date :11.06.2013
Location: Kamrup district
Family :Cyperaceae
Genus & species : Cyperus sp.
Habitat: Grows wild on waste places
Habit : Herb Two closely looking Cyperus are 1) C. distans L. f. 2) C. nutans Vahl The key in Bengal Plants :-
i) mature spikelets patent; glumes obtuse ——— distans
ii) mature spikelets collapsing, tufted; glumes often minutely mucronate —— nutans
FBI. vi. 608. notes “… it is difficult to draw a line between this species (C. nutans) and fine examples of C. distans”
For its patent spikelets i think this species is C. distans L. With its laxly distichous red spikelets this is C. distans L.f.
Hooghly Today : Cyperus nutans Vahl ? : Attachments (15). 5 posts by 2 authors.
This cyperus is growing on a railway-platform, as you can see in the 1st pic. The middle one (2 or 3 in a bundle) with immature spikes and the left one (2 or 3 in a bundle) with mature spikes.
Each plant is with a culm of about 1.5 ft.. compressed 3 angled, about 6 mm wide. Leaves are longer that culm and involucre about same size of culm. The difference between C. distans & C. nutans in FoC – http://www.efloras.org/florataxon.aspx?flora_id=2&taxon_id=109010#KEY-1-54
In FBI –
The species in this thread and in https://groups.google.com/indiantreepix/3Xxo can be same, or vice versa. I may well be wrong, but this seems to be same C. distans L. f.
Cyparaceae ID from Bangladesh SM115 : 3 posts by 2 authors. Attachments (2).
Habit: Shrub Looks like Cyperus distans L.f. . Grass ID from Bangladesh SM110 : 8 posts by 4 authors. Attachments (2).
Habit: Herb
Habitat: Wild Location: Dhaka Flowering: June Cyperus odoratus Belongs to Cyperus (cyperaceae); may be C. diffuses It is Cyparaceae member. Probably Genus Cyperus Looks like Cyperus distans L.f. It is Cyprus distans
Grass ID from Bangladesh SM135 : 4 posts by 3 authors. Attachments(2).
Habit: Herb Cyperus sp. Looks like Cyperus distans L.f. Location : Aizawl (MZU) Pl. check with images at Cyperus distans L.f. It is Cyperus distans L.f.    Cyperaceae plant for id: 3 high res. images. Request for I’d of a Cyperaceae plant from Bilaspur. Photographed in August 2022. To me appears close to images at Cyperus distans L.f. Pl. check.
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