Trisetum spicatum ( Linnaeus 1753: 64 ) K. Richter (1890: 59)

Talebi, Amir, Naqinezhad, Alireza & Attar, Farideh, 2022, Trisetum spicatum (Poaceae: Pooideae): an interglacial relict in the Iranian mountains, Phytotaxa 532 (1), pp. 85-92 : 87

Trisetum spicatum ( Linnaeus 1753: 64) K. Richter (1890: 59) .

Basionym: Aira spicata Linnaeus (1753: 64) .

Synonym: Avena subspicata Linnaeus (1759: 873) .

Description

Perennial, caespitose, culms up to 20 cm high, densely tufted, erect, or geniculately ascending, totally covered with sparse to dense hairs (densely tomentose below the inflorescence), hairs retrorse, spreading, or horizontal in upper parts. Leaf sheath and blade sparsely tomentose, leaf blade flat or convolute, -8.0 cm × 1.0–2.0 mm, hirsute, leaf sheath membranous on margin, ligule 1.0–2.0 mm long, obtuse and irregularly laciniate. Peduncle 1.0 mm wide, with dense intricate and retrorse hair (up to 0.7 mm long), mostly retrorse. Inflorescence a panicle, dense, linear to ovate, 2.0–6.0 × 0.5–1.0 cm, interrupted in lower part (slightly loose at base), branches appressed pubescent throughout the panicle. Floret callus pubescent. Spikelet laterally compressed, up to 5.0 mm (9.0 mm including an awn), with 2 (3) florets, rhachilla internodes pubescent, glumes persistent, membranous, subequal, lower glume 3.0–4.0 mm, upper glume 4.0–5.0 mm, glume apex acute, keel scaberulous, lemma 4 mm, membranous, keeled, glabrous, or puberulous, dentate (2 -fid) at apex, 0.5-0.7 mm, awned from upper 1/3, awn 3.0–4.0 mm, geniculate, Palea keel scaberulous. Anther 3, ca.1.0 mm long. Ovary glabrous.

Specimens examined:— IRAN. Mazandaran Province, Damavand Mt., 4070 m a.s.l, 35˚55’ 42.6ʺN, 52˚08’ 03.7ʺ E, 8/17/2011, Talebi 68424 (TUH)

Chromosome number:— 2n=28, 42 (Randal & Hilu 1986, Dawson 2000)