Eriochloa procera

Eriochloa procera (Retz.) C.E.Hubb., Bull. Misc. Inform. Kew 1930: 256 1930. (Syn: Agrostis procera Retz.; Agrostis ramosa (Retz.) Poir.; Eriochloa annulata (Flüggé) Kunth; Eriochloa hackelii Honda; Eriochloa polystachya Hook. f. .; Eriochloa procera var. involucrata (Hack.) Jansen .; Eriochloa ramosa (Retz.) Kuntze .; Eriochloa sundaica Miq.; Helopus annulatus (Flüggé) Nees; Helopus javanicus Steud.; Helopus laevis Trin. [Invalid]; Helopus pilosus (Retz.) Trin.; Milium orixense Roxb. ex Hook.f. [Invalid]; Milium ramosum Retz.; Milium zonatum Llanos; Panicum annulatum (Flüggé) A.Rich.; Paspalum annulatum Flüggé; Piptatherum annulatum (Nees) J.Presl [Illegitimate]; Thysanolaena procera (Retz.) Mez; Vilfa procera (Retz.) P.Beauv.);

Ethiopia to Mozambique, Madagascar, Trop. & Subtrop. Asia to Australia: Andaman Is., Assam, Bangladesh, Borneo, Burundi, China Southeast, Ethiopia, Hainan, India, Jawa, Kenya, Laos, Lesser Sunda Is., Madagascar, Malaya, Maluku, Mozambique, Myanmar, New Guinea, New South Wales, Nicobar Is., Northern Territory, Pakistan, Philippines, Queensland, South Australia, South China Sea, Sri Lanka, Sulawesi, Sumatera, Taiwan, Tanzania, Thailand, Uganda, Vietnam, West Himalaya, Western Australia, Zaïre; Introduced into: Arizona, Ascension, California, Caroline Is., Chagos Archipelago, Colombia, Cook Is., Ecuador, Fiji, Guyana, Hawaii, Marianas, Mississippi, Nansei-shoto, Ogasawara-shoto, Peru, Samoa, St.Helena, Suriname, Tonga, Vanuatu as per POWO;
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Common name: Tropical Cupgrass

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grass ID (3) from Hooghly 15/7/12 SK3:

Found this grass in a ditch.
Could this be Brachiaria mutica Stapf.?

Species : UNKNOWN

Habit & Habitat : about 2.5 feet high

Date : 11/7/12, 9.52 A.M.
Place : Hooghly

On detailed look, I found that the leaf sheaths are not hairy. This grass is Eriochloa procera. The identification feature is a round callus just below the spikelets and the branched panicle. This round callus is usually black or dark in colour, but not very clear in the photograph. You can see it if you look closely. The habitat of this grass is also semi-aquatic. Brachiaria mutica inflorescence looks similar, but is much denser and contracted than this one. The leaves of Brachiaria mutica are also densely hairy. So, finally, it is Eriochloa procera.

Attaching some more pictures of the same grass, recorded yesterday (26/7/12), at the same place. This time i noticed that the grass is taller than what i thought before.

It is Eriochloa procera. The inflorescence becomes quite large in high nutrition conditions like in drainage channels, etc. The swollen round callus just below the spikelet is the most distinguishing character. This callus is also often seen turning brown or black in some places. This callus is clearly visible in the upper right spikelet in the image DSCN7620b.jpg.

Certainly this is not Brachiaria mutica, which features, as you stated earlier, “… leaves densely hairy… inflorescence denser”, besides the round callus. I have seen pictures of B.mutica at – http://www.tropicalforages.info/Brachiaria_mutica.htm

I have also seen pictures of Eriochloa procera at – http://www.oswaldasia.org/eripr_en.html. I wanted to share more clear pictures of this grass, Eriochloa procera, as have been identified by you.
Thank you very much, once again, for explaining the keys one more time.

Poaceae from Kiraoli, Agra, U.P 11112019 : 4 posts by 2 authors. Attachments (2)