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

21. Elymus nakaii (Kitagawa) S. L. Chen, Fl. China. 22: 411. 2006.

吉林披碱草 ji lin pi jian cao

Basionym: Roegneria nakaii Kitagawa, Rep. Inst. Sci. Res. Manchoukuo 5(5): 151. 1941.

Culms erect, slightly decumbent at base, ca. 100 cm tall, ± puberulent at nodes. Leaf sheath glabrous, or retrorsely pubescent proximally; leaf blade flat, 11–20 × 0.4–0.7 cm, thin, abaxial surface glabrous, adaxial surface pilose. Spike erect, 10–13 cm. Spikelets 1 per node, ± secund, dense, with ca. 5 florets. Glumes lanceolate, proximal one 9–10 mm including point, distal one 9.5–11.5 mm including point, (3–)5(–7)-veined, scabrous along veins, margin glabrous, apex acuminate. Lemma hirsutulous near base and margin and along veins, otherwise glabrous; first lemma ca. 10 mm; awn reflexed, 18–22 mm. Palea subequaling lemma, rigidly ciliate along keels, between keels glabrous proximally and puberulent distally, apex emarginate, truncate, or subrounded. Fl. and fr. Jul–Aug. 2n = 28*.

Meadows, mountain slopes. Hebei, Jilin, Nei Mongol, Ningxia [N Korea].

Löve (Feddes Repert. 95: 454. 1984) did not previously validly publish the combination Elymus nakaii because the place of valid publication of the basionym was not cited (Saint Louis Code, Art. 33.3). Instead, Roegneria nakaii was cited from Kitagawa (J. Jap. Bot. 17: 236. 1941), where the name was not validly published because no Latin description was provided (Art. 36.1).


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