Enneapogon brachystachyus

Enneapogon brachystachyus (Jaub. & Spach) Stapf in Thiselt.-Dyer, Fl. Cap. 7:654. 1900. Tackholm & Drar, Fl. Egypt 1:220. 1941; Sultan & Stewart, Grasses W. Pak. 2:160. 1959; Bor, Grasses Burma Ceyl. Ind. Pak. 608. 1960; Bor in Rech.f., Fl. Iran. 70: 415. 1970. (syn: Pappophorum arabicum Hochst. ex Steud.; Pappophorum brachystachyum Jaub. & Spach) as per Flora of Pakistan;
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Enneapogon desvauxii P.Beauv., Ess. Agrostogr. 82 1812. (syn: Agrostis ciliata Pall. ex Kom. [Invalid]; Cottea sarmentosa Nees ex Steud.; Czerniaevia rupestris Turcz. ex Kom. [Invalid]; Enneapogon borealis (Griseb.) Honda; Enneapogon brachystachyus (Jaub. & Spach) Stapf; Enneapogon brachystachyus var. macrantherus Stapf; Enneapogon desvauxii subsp. borealis (Griseb.) Tzvelev; Enneapogon jinjiangensis B.S. Sun & S. Wang; Enneapogon lophotrichus Chiov. ex H.Scholz & P.König; Enneapogon phleioides Roem. & Schult.; Enneapogon pusillus Rendle; Enneapogon wrightii (S.Watson) Roshev.; Enneapogon wrightii (S. Watson) C.E. Hubb.; Pappophorum arabicum Hochst. ex Steud.; Pappophorum boreale Griseb.; Pappophorum brachystachyum Jaub. & Spach; Pappophorum brachystachyum var. trilophum Chiov.; Pappophorum bulbosum Fig. & De Not.; Pappophorum fasciculatum Chiov.; Pappophorum figarianum Fig. & De Not.; Pappophorum jaminianum Coss. & Durieu ex Boiss. [Invalid]; Pappophorum mexicanum E.Fourn.; Pappophorum nanum Steud. [Illegitimate]; Pappophorum phleoides Turcz.; Pappophorum pusillum (Rendle) K.Schum.; Pappophorum vincentianum J.A.Schmidt; Pappophorum wrightii S.Watson) as per The Plant List Ver.1.1;
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Africa, Temp. Asia to Indian Subcontinent, WC. U.S.A. to Mexico, Peru to Argentina: Algeria, Angola, Argentina Northeast, Argentina Northwest, Arizona, Bolivia, Botswana, Buryatiya, California, Canary Is., Cape Provinces, Cape Verde, Chad, Chile North, China North-Central, China South-Central, China Southeast, Chita, Colorado, Djibouti, Egypt, Eritrea, Ethiopia, Free State, Gulf States, India, Inner Mongolia, Kazakhstan, Kenya, Kirgizstan, Krasnoyarsk, Libya, Mali, Manchuria, Mauritania, Mexico Central, Mexico Northeast, Mexico Northwest, Mexico Southwest, Mongolia, Morocco, Namibia, Nevada, New Mexico, Niger, Northern Provinces, Oklahoma, Oman, Pakistan, Palestine, Peru, Qinghai, Saudi Arabia, Sinai, Socotra, Somalia, Sudan, Tanzania, Texas, Tunisia, Tuva, Utah, Western Sahara, Xinjiang, Yemen, Zimbabwe as per POWO (Enneapogon desvauxii P.Beauv.);
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Algeria; Angola; Argentina Northeast; Argentina Northwest; Arizona; Bolivia; Botswana; Buryatiya; California; Canary Is.; Cape Provinces; Cape Verde; Chad; Chile North; China North-Central; China South-Central; China Southeast; Chita; Colorado; Djibouti; Egypt; Eritrea; Ethiopia; Free State; Gulf States; Hawaii; India; Inner Mongolia; Kazakhstan; Kenya; Kirgizstan; Krasnoyarsk; Libya; Mali; Manchuria; Maryland; Mauritania; Mexico Central; Mexico Northeast; Mexico Northwest; Mexico Southwest; Mongolia; Morocco; Namibia; Nevada; New Mexico; Niger; Northern Provinces; Oklahoma; Oman; Pakistan; Palestine; Peru; Qinghai; Saudi Arabia; Sinai; Socotra; Somalia; Sudan; Tanzania; Texas; Tunisia; Tuva; Utah; Western Sahara; Xinjiang; Yemen; Zimbabwe as per Catalogue of Life;
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As per efi thread:
I too agree that E.brachystachyus should not be considered synonymous to E.desvauxii. 
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Enneapogon persicus FOR VALIDATION :: Rao Jodha Desert Rock Park : 8 posts by 3 authors. 3 images.
Rao Jodha Desert Rock Park  Jodhpur
Date: October 24, 2018 … Altitude: about 300 m (980 feet) asl
¿ Enneapogon persicus ?  

Dear friends,
I am aware that ID of grass cannot be attempted with photos alone; yet I am posting few photos with the hope that it can be identified at least to genus level, based on distribution and general appearance. The posted grass was growing in some patches of the park.

love the third picture esp
although i really cant help nail down the id

Thanks … And I am depending solely on the third picture – that it helps in recognizing the grass rather than identifying !

Enneapogon brachystachyus found gregariously in deserts of India and Africa. Presently, it is considered as a synonym of E.desvauxii, which is an American species. However, further study is required to analyse the similarities and differences between the two. Please see the specimen from Bikaner seen by Bor in GBCIP – (D.Gupta s.n., Bikanir (I don’t know where it is kept)). Enneapogon persicus is found in higher elevations above 1000m in dry arid slopes.

At iNaturalist, Patrick Alexander is sure that the ID of posted plant is not Enneapogon desvauxii P.Beauv. … he suggests Enneapogon cenchroides (Licht.) C.E.Hubb.

I too agree that E.brachystachyus should not be considered synonymous to E.desvauxii. 
E.cenchroides has a denser inflorescence with longer glumes and awns. Also four awns are shorter than the other five awns, whereas E.brachystachys has equal awns and shorter glumes. (Dissection photos with scale may confirm)

 

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References:
Catalogue of Life  POWO (Enneapogon desvauxii P.Beauv.)  The Plant List Ver.1.1  IPNI  GBIF (with high resolution specimens) Flora of Pakistan  SEINet Portal Network  Vegetational Wealth Of Aravalli Ranges  Flora of Aden