Poaceae

Z. biebersteiniana (Claus) P. Smirnovin Bull. Soc. Nat. Mosc. n.s. 2, 51(2): 67(1946).
Annual. Stems 8-38 cm, erect, smooth, glabrous, 3-noded. Leaf sheaths glabrous; ligules 0.9-3.5 mm, obtuse; blades 0.8-7 cm x 0.4-2 mm, linear, acuminate. Panicle 4-15 x3-18 cm, rather diffuse; branches 1.5-10 cm, erecto-patent, trichotomously arranged; pedicels 5-13 mm, clavate, glabrous. Spike-lets 1.3-2 mm. Glumes usually elliptic, acute to subobtuse, glabrous. Anthers 0.5-0.7 mm. Caryopsis ovoid, with pitted surface.
1. Spikelets 1.3-1.5(-1.6) mm;leaf blades convolute;glumes ovate, obtuse subsp. biebersteiniana
1. Spikelets 1.6-2 mm; leaf blades flat; glumes ovate-elliptic, acute subsp. trichopoda
subsp. biebersteiniana. Syn: Agrostis biebersteiniana Claus, Localfl. Wolg. (Beitr. Pfl. Russ. Reich. 8):264 (1851)! A. trichoclada Griseb. in Ledeb., Fl. Ross. 4:439 (1852); A. biebersteiniana Claus var. densior Hackel in Grecescu, Consp. Fl. Roman. 603 (1928); Z. trichopoda (Boiss.) P. Smirnov subsp. bieb-ersteiniana (Claus) M. Doğan in Notes R.B.G. Edinb. 40:86 (1982)! comb. inval. Map 71. Fl. 7. Open places in Quercus infectoria woods, volcanic rocky places, 1650-1750 m.
Type: [USSR] circa Sareptam [Krasnoarmeisk, now a suburb of Volgo-grad], 1850, K. Claus (holo. LE, iso. LE!).
E. Anatolia. A/B8 Erzurum: Tazligedik, 24 vii 1916, Sapozhnikov. A9 Kars: Sarıkamış, 7 vii 1916, Sapozhnikov. B5 Kayseri: ErciyasDa., nr Sarıgöl, Penther& Zederbauer. B9 Bitlis: d. Tatvan, Sorgun above Van G., 1650-1750 m, Peşmen 2990! Muş: Malazgirt, 10 vi 1916, Sapozhnikov.
Crimea, Caucasia, S.E. Russia. Ir.-Tur. element. The combination Z. tri-chopoda subsp. biebersteiniana is invalid since the basionym of Z. trichopoda was published later than that of Z. biebersteiniana.