Arctagrostis latifolia (R. Brown) Grisebach subsp. latifolia

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 : 202

Arctagrostis latifolia (R. Brown) Grisebach subsp. latifolia

Materials examined. CANADA – Nunavut • Ellesmere Island, CFS Alert; 82°29′14″N, 062°02′05″W; 20 m a.s.l.; 30 Jul. 2019; habitat: wetland near the ocean shore, with tussocks made of peat, dominated by Eriophorum triste and Alopecurus magellanicus ; QFA 0635519 • same locality; 82°27′49″N, 062°34′42″W; 126 m a.s.l.; 25 Jul. 2019; habitat: wetland, with tussocks made of peat and till, dominated by Eriophorum triste , Arctagrostis latifo- lia, and Alopecurus magellanicus ; QFA 0635547.

Identification. Plants 14–27 cm high; herbaceous; not caespitose. Fibrous roots and rhizomes present. Stems 10–21 cm long; erect; glabrous. Leaves basal and cauline; alternate. Sheath margins scaberulous. Ligules 1.3– 2.1 mm long. Basal leaf blades 16–58 mm long, 1.6–6.0 mm wide; linear; flat or involute; abaxial and adaxial sur- faces both scabrous; margins scabrous. Flag leaf blades 9–12 mm long, 0.8–1.5 mm wide. Inflorescence a dense or diffuse panicle; 30–75 mm long. Branches at lowest inflorescence node 4–5; 2.1–18.0 mm long. Pedicels sca- brous. Spikelets 4.0– 4.8 mm long, 1.1–1.3 mm wide. Florets per spikelet 1–2. First glumes 2.4–2.9 mm long; lanceolate; surface glabrous; margins glabrous; apices acute. Second glumes 2.9–3.7 mm long (shorter than the lowest floret); lanceolate; vein 1; surface glabrous; mar- gins glabrous; apices acute. Lemmas 4.1–4.7 mm long, 0.7–0.9 mm wide; lanceolate; keeled; veins 3–5; surface dull and scabrous; apices acute and glabrous; awnless. Palea 3.9–4.1 mm long; veins scabrous. Rachilla between first and second lemmas 0.4–1.0 mm long. Androecium with 3 stamens and 2.0– 2.4 mm long anthers. Gynoecium with 2 styles.