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Psathyrostachys consists of several cespitose species that usually have 3 spikelets per node (sometimes only 2) and subulate glumes. The rachises are usually described as fragile, disarticulating, or breaking up at maturity but those of P. juncea, the only species with which I am familiar, do so very tardily. The following table is based on Baden (1991) with some additions from the draft treatment for the Flora of China. The species have the Ns genome. Comments can be sent to Mary Barkworth.

Psathyrostachys caduca (Boiss.) Melderis Afghanistan      
Psathyrostachys fragilis (Boiss.) Nevski        
Psathyrostachys fragilis (Boiss.) Nevski subsp. fragilis Iran   14  
Psathyrostachys fragilis subsp. secaliformis Tzvelev Caucasus, Iran, Iraq, Turkey      
Psathyrostachys fragilis subsp. villosus C. Baden Turkey      
Psathyrostachys huashanica Keng ex Kuo China (Shaanxi)   14  
Psathyrostachys juncea (Fischer) Nevski Afghanistan, Russia, C. Asia, China   14  
Psathyrostachys juncea (Fischer) Nevski var. juncea China( Gansu, Nei Mongol, Xinjian), C. Asia, Russia; Introduced: U.S.A     Flora of China recognizes two varieties; Baden did not.
Psathyrostachys juncea var. hyalantha (Rupr.) S.L. Chen China (Xinjiang), C. Asia, Russia     Flora of China recognizes two varieties; Baden did not.
Psathyrostachys kronenburgii (Hack.) Nevski China (Xinjiang), Kazakhistan, Kyrgistan, Tadzhikistan, C. Asia      
Psathyrostachys lanuginosa (Trin.) Nevski Afghanistan, China (Xinjiang), Kazakhstan, Kyrgistan, C. Asia, W. Siberia   14, 28  
Psathryostachys rupestris (Alex.) Nevski        
Psathryostachys rupestris (Alex.) Nevski subsp. ruprestris Dagestan   14  
Psathryostachys rupestris subsp. daghestanica (Alex.) A. Love Dagestan   14  
Psathyrostachys stoloniformis C. Baden China (Gansu, Qinghai)   14