Tragus racemosus

Tragus racemosus (L.) All., Fl. Pedem. 2: 241 (1785) (syn: Aira malatrina Buch.-Ham. ex Wall. ; Cenchrus linearis Lam.; Cenchrus racemosus L. ; Lappago biflora Roxb.; Lappago decipiens Fig. & De Not. ; Lappago racemosa (L.) Honck.; Nazia racemosa (L.) Kuntze; Phalaris muricata Forssk. ; Tragus adriaticus Gand. ; Tragus arenarius Bremek. & Oberm. ; Tragus biflorus Schult.; Tragus brevicaulis Boiss. ; Tragus decipiens (Fig. & De Not.) Boiss. ; Tragus echinatus Cav. ; Tragus halleri Döll ; Tragus muricatus Moench; Tragus orientalis Nees ; Tragus pallens Gand. ; Tragus paucispinus Hack. ; Tragus racemosus var. biflorus Hack.; Tragus racemosus var. decipiens (Fig. & De Not.) T.Durand & Schinz ; Tragus racemosus f. divaricatus Döll ; Tragus racemosus var. erectus Mutel ; Tragus racemosus f. erectus Döll ; Tragus racemosus var. longispicula Döll; Tragus racemosus var. paucispinus (Hack.) Maire ; Tragus racemosus var. remotus Suess.);
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Europe to Central Asia and Pakistan, Tropical & S. Africa to Arabian Peninsula: Afghanistan, Albania, Algeria, Angola, Austria, Baleares, Belgium, Botswana, Bulgaria, Burkina, Canary Is., Cape Provinces, Cape Verde, Central African Repu, Chad, Congo, Corse, Czechoslovakia, Egypt, Eritrea, Ethiopia, France, Free State, Greece, Gulf States, Hungary, Iran, Italy, Kazakhstan, Kenya, Krym, KwaZulu-Natal, Lesotho, Libya, Mali, Mauritania, Morocco, Namibia, Niger, North Caucasus, Northern Provinces, Oman, Pakistan, Palestine, Romania, Réunion, Sardegna, Saudi Arabia, Sicilia, Somalia, South European Russi, Spain, Sudan, Switzerland, Tadzhikistan, Transcaucasus, Tunisia, Turkey, Turkey-in-Europe, Turkmenistan, Western Sahara, Yemen, Yugoslavia, Zimbabwe; Introduced into: Argentina Northeast, Arizona, Bangladesh, Cuba, Germany, Jamaica, Japan, Jawa, Maine, Maryland, Massachusetts, Mauritius, New Jersey, New York, North Carolina, Pennsylvania, Peru, Ukraine as per POWO;
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Poaceae: Tragus racemosus (L.) All.: 1 high res. image.
synonym: Tragus biflorus Schult.
location/date: Chotannahalli, Tumkur Dist., Karnataka, July 1997

The whole genus is a taxonomic mystery and a play of names by various authors. There is no one opinion. There are so many intermediate types and so, it is not right to separate these into different species. 

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References:
POWO  Catalogue of Life  India Biodiversity Portal  Wikipedia