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FOC | Family List | FOC Vol. 22 | Poaceae | Deyeuxia

14. Deyeuxia korotkyi (Litvinov) S. M. Phillips & Wen L. Chen, Novon. 13: 321. 2003.

兴安野青茅 xing an ye qing mao

Calamagrostis korotkyi Litvinov, Schedae Herb. Fl. Ross. 55: no. 2750. 1918; C. korotkyi subsp. turczaninowii (Litvinov) Tzvelev; C. turczaninowii Litvinov; Deyeuxia turczaninowii (Litvinov) Y. L. Chang ex S. L. Lu.

Perennial, tufted. Culms erect, 30–80 cm tall, 1.5–3 mm in diam., 2–3-noded. Leaf sheaths smooth, rarely puberulous; leaf blades grayish green, flat, stiff, (4–)10–20 cm, 4–11 mm wide, both surfaces smooth, margins scabrid, apex finely acuminate; ligule 3–5 mm, truncate. Panicle dense, spikelike, 3–15 × 1–1.5 cm; branches in whorls of 3–5, appressed to rachis, 1–2 cm, scabrid. Spikelets 5–7 mm, yellowish green or purplish; glumes lanceolate, subequal or lower glume ca. 1 mm longer than upper, lower glume 1-veined, upper glume 3-veined, smooth or scabrid only along midvein, apex acuminate; callus hairs ca. 1/3 length of lemma, sparse, unequal; lemma 4–5 mm, firmly membranous, apex denticulate; awn sub-basal, 7–11 mm, well exserted from spikelet, geniculate with twisted column; palea subequal to or slightly shorter than lemma; rachilla 1.5–2 mm, including hairs 2.5–4 mm. Anthers ca. 3 mm. Fl. Aug.

Grassy slopes, dry woodlands; 300–2500 m. N Heilongjiang, N Nei Mongol, NW Xinjiang [Mongolia, E Russia].

Deyeuxia turczaninowii var. nenjiangensis S. L. Lu (Acta Biol. Plateau Sin. 2: 19. 1984) has been described from N Heilongjiang and Nei Mongol. It may be the hybrid D. korotkyi × Calamagrostis epigeios. It differs from typical D. korotkyi by its looser panicle, narrower glumes, and longer callus hairs ca. 3/4 as long as the lemma. It is intermediate between the putative parents in these characters.


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