Survey of the vascular plants of Alert (Ellesmere Island, Canada), a polar desert at the northern tip of the Americas Author Desjardins, Émilie Author Lai, Sandra Author Payette, Serge Author Dubé, Martin Author Sokoloff, Paul C. Author St-Louis, Annie Author Poulin, Marie-Pier Author Legros, Jade Author Sirois, Luc Author Vézina, François Author Tam, Andrew Author Berteaux, Dominique text Check List 2021 2021-02-09 17 1 181 225 http://dx.doi.org/10.15560/17.1.181 journal article 10.15560/17.1.181 1809-127X Cardamine bellidifolia Linnaeus Materials examined. CANADA – Nunavut • Ellesmere Island , CFS Alert ; 82°25′52″N , 062°07′49″W ; 296 m a.s.l. ; 16 Jul. 2019 ; habitat: wetland in a mountain pass, with peat and rocks as substrates, dominated by moss and Saxifraga cernua Linnaeus ; QFA0635556 . Identification. Plants 1.5–4.0 cm high; herbaceous; caespitose. Taproots present. Stems 1–3 cm long; erect or ascending; glabrous. Leaves basal and cauline; isomorphic; alternate; petiolate. Petioles 5–9 mm long; not winged; glabrous. Leaf blades 3–6 mm long, 1.5–4.2 mm wide; ovate; bases cuneate or obtuse; abaxial and adaxial surfaces both glabrous; margins glabrous; apices rounded or obtuse. Inflorescence a raceme, with 2–4 flowers; not elongating or slightly elongating as the fruit matures. Pedicels glabrous. Sepals 4; 1.8–2.2 mm long, 0.7–1.2 mm wide; ovate or oblong; green or purple, with hyaline margins; surface glabrous; margins glabrous; apices rounded or obtuse. Petals 4; 2.6–3.8 mm long, 0.8–1.4 mm wide; obovate; unlobed; not clawed; white. Androecium with 6 stamens and 0.4–0.5 mm long anthers. Gynoecium with 1 style and 1 stigma. Fruit a silique; 7–16 mm long, 0.6–1.1 mm wide; elongate-linear or elongateelliptic; flattened; dark purple; glabrous. Styles persist- ing in fruit 0.6–1.4 mm long, 0.4–0.5 mm wide. Stigmas 0.4–0.5 mm wide; as wide as the styles. Cardamine bellidifolia differs from Cardamine pole- monioides Rouy, also present on Ellesmere Island ( Aiken et al. 2007 ), by having simple cauline leaves when present (in contrast to compound, 7–21 foliolate, or -pinnatisect cauline leaves; Al-Shehbaz et al. 2010a ; Saarela et al. 2020 ), and ≤ 7 mm long, not clawed petals (in contrast to 9.0– 12.3 mm long, clawed petals; Saarela et al. 2020 ).