Pleuropogon sabinei R. Brown

Desjardins, Émilie, Lai, Sandra, Payette, Serge, Dubé, Martin, Sokoloff, Paul C., St-Louis, Annie, Poulin, Marie-Pier, Legros, Jade, Sirois, Luc, Vézina, François, Tam, Andrew & Berteaux, Dominique, 2021, Survey of the vascular plants of Alert (Ellesmere Island, Canada), a polar desert at the northern tip of the Americas, Check List 17 (1), pp. 181-225 : 207-208

Pleuropogon sabinei R. Brown

Materials examined. CANADA – Nunavut • Ellesmere Island , CFS Alert; 82°26′26″N, 062°01′49″W; 147

m a.s.l.; 23 Jul. 2019; habitat: wetland on the margins of a lake, with peat as substrate, dominated by moss and Luzula nivalis ; QFA 0635537.

Identification. Plants 9.5–19.5 cm high; herbaceous; not caespitose. Fibrous roots and rhizomes present. Stems 5–14 cm long; erect or ascending; glabrous. Leaves basal and cauline. Sheath margins glabrous. Ligules 1.8–2.6 mm long. Basal and cauline leaf blades (attached below the middle of the stem) 24.5–59.0 mm long, 0.9–1.1 (2.0– 2.6 flat) mm wide; linear; folded or flat; abaxial and ad- axial surfaces both glabrous; margins glabrous. Flag leaf blades absent or present; 8.8–16.0 mm long, 0.9–1.3 mm wide. Inflorescence a diffuse raceme with spikelets at- tached on one side; 43–60 mm long. Branches at lowest inflorescence node 1; 1–12 mm long. Pedicels glabrous. Spikelets 4.8–12.5 mm long, 1.6–3.5 mm wide. Florets per spikelet 6–10. First glumes 1.5–2.1 mm long; ovate; surface glabrous; margins glabrous; apices obtuse. Second glumes 1.8–2.8 mm long (shorter than the lowest flo- ret); ovate; veins 3; surface glabrous; margins glabrous; apices rounded. Lemmas 3.6–4.0 mm long, 1.1–1.2 mm wide; oblanceolate; rounded on the back; veins 5–7; surface dull and hairy, with short hairs on and between the veins; apices rounded and glabrous; awnless. Palea 3.6– 4.2 mm long; veins scabrous; with awn arising near the base of each palea keel; awns 2.6–3.5 mm long. Rachilla between first and second lemmas 0.9–1.3 mm long. An- droecium with 3 stamens and 2.2–2.9 mm long anthers. Gynoecium with 2 styles.