Neotrinia (Tzvelev) M. Nobis, P. Gudkova & A. Nowak, Turczaninowia 22 (1): 40. 2019

Peterson, Paul M., Romaschenko, Konstantin, Soreng, Robert J. & Reyna, Jesus Valdes, 2019, A key to the North American genera of Stipeae (Poaceae, Pooideae) with descriptions and taxonomic names for species of Eriocoma, Neotrinia, Oloptum, and five new genera: Barkworthia, x Eriosella, Pseudoeriocoma, Ptilagrostiella, and Thorneochloa, PhytoKeys 126, pp. 89-125 : 97

Neotrinia (Tzvelev) M. Nobis, P. Gudkova & A. Nowak, Turczaninowia 22 (1): 40. 2019

Achnatherum sect. Neotrinia Tzvelev, Novosti Sist. Vyssh. Rast. 9: 55. 1972.

Type.

Neotrinia splendens (Trin.) M. Nobis, P. Gudkova & A. Nowak (≡ Stipa splendens Trin.).

Description.

Plants perennial, cespitose, robust, not rhizomatous with intravaginal branching. Culms 40-250 cm tall, 2-5 mm thick below with 3-7 nodes, glabrous, smooth. Leaf sheaths glabrous, becoming fibrous below, margins ciliate, striate; collars glabrous; ligules membranous, glabrous; basal ligules 1-2.5 mm long, apex truncate to obtuse; upper ligules 2.5-12 mm long, apex acute; blades 20-60 cm long, 2-7 (-10) mm wide, flat or involute, deeply grooved, glabrous, abaxial surface smooth, adaxial surface scabrous. Panicles 15-50 cm long, (4-) 8-35 cm wide, ovate; ascending branches up to 15 cm long, crowded or loosely spreading, whorled at most nodes. Spikelets 4-7 (-8.5) mm long, lanceolate, subterete with one fertile floret without rachilla extension; disarticulation above the glumes; glumes 2.5-6.5 mm long, subequal, membranous, (1-) 3-5-veined, without keels; lower glumes 2.5-4.4 mm long, shorter than the upper, 1 (-3)-veined, margins hyaline; upper glumes 4-6.5 mm long, 3-5-veined, apex acute; florets 4.2-7.2 mm long; calluses 0.3-0.5 mm long, elliptic, bearded; lemmas 4.2-7.2 mm long, evenly hairy, the hairs up to 1.5 mm long, apex 2-lobed, the lobes 0.5-1.3 mm long; lemma epidermal pattern saw-like; fundamental cells of variable length with lobate sidewalls 3-10 times longer than silica cells, irregularly alternating; silica bodies round, paired with crescent-shaped cork cells; lemmatal awns 5-12 mm long, straight or indistinctly 1-geniculate, slightly twisted and flexuous; paleas about as long or slightly shorter than the lemmas, 2-veined, hairy; stamens 3, anthers 3.5-4.5 mm long, penicillate, yellow; lodicules 3; stigmas 2; ovary glabrous. Caryopses 2-4 mm long, fusiform, pericarp adherent, hilum linear. Chromosome number 2 n = 42, 46, 48 ( Freitag 1985; Gohil and Koul 1986).