Survey of the vascular plants of Alert (Ellesmere Island, Canada), a polar desert at the northern tip of the Americas 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 Check List 2021 2021-02-09 17 1 181 225 WMY2 Linnaeus Linnaeus [810,1201,1727,1751] Magnoliopsida Brassicaceae Cochlearia Plantae Brassicales 9 190 Tracheophyta species groenlandica   Figure 5C   Materials examined. CANADA–  Nunavut• Ellesmere Island, CFSAlert; 82°29′56″N, 062°19′19″W; 48 ma.s.l.; 8 Aug. 2019; habitat: xeric near the sewage outlet, with till and rocks as substrates, and sparse dominance of  Puccinellia angustata(R. Brown) E. L. Rand & Redfield and  Cochlearia groenlandica; QFA0635554 • same locality; 82°31′13″N, 062°25′46″W; 44 ma.s.l.; 27 Jul. 2019; habitat: mesic, with polygonal patterned ground made of till, dominated by  Alopecurus magellanicus   Figure 5. Brassicaceae. A.  Braya purpurascens(R. Brown) Bunge ex Ledebourhabit. B.  Braya thorild-wulffiiOstenfeldsubsp.  thorild-wulffiihabit C.  Cochlearia groenlandicaLinnaeushabit. D.  Draba corymbosaR. Brown ex de Candollesepals and open flowers, and E.habit. F.  Draba subcapitataSimmonsfruit-forming. Photos A by Jacob Caron Carrier, B, D, E, F by Émilie Desjardins, and C by Charline Couchoux. Lamarck and  Saxifraga oppositifolia; QFA0635555.  Identification.Plants 2.5–6.0 cm high; herbaceous; caespitose. Taproots present. Stems 1.0– 4.5 cmlong; erect, ascending, or decumbent; glabrous. Leaves basal and cauline; heterophyllous; alternate; long-petiolate (basal leaves), short-petiolate (lower cauline leaves), and sessile (upper cauline leaves). Basal leaf petioles 8–13 mmlong; not winged; glabrous. Basal leaf blades 4–6 mmlong, 5–7 mmwide; ovate or deltate; bases truncate or subcordate; abaxial and adaxial surfaces both glabrous; margins glabrous; apices rounded or obtuse. Cauline leaf blades 3.6–9.0 mm long, 1.2–2.9 mmwide; oblanceolate; unlobed or lobed, with 1–2 triangular acute lobes on each side; bases cuneate. Inflorescence a raceme, with 5–12 flowers; elongating as the fruit matures. Pedi- cels glabrous. Sepals 4; 0.8–1.8 mmlong, 0.4–0.8 mmwide; ovate or oblong; pale brown or purple, with hyaline margins; surface glabrous; margins glabrous; apices rounded or obtuse. Petals 4; 1.1–2.4 mmlong, 0.2–1.0 mm wide; obovate; unlobed; white and sometimes pinkish tinged. Androecium with 6 stamens and 0.2–0.3 mmlong anthers. Gynoecium with 1 style and 1 stigma. Fruit a silique; 3.7–5.9 mmlong, 2.2–3.2 mmwide; spherical or ovoid; yellowish green or greyish purple; glabrous. Styles persisting in fruit 0.2–0.4 mmlong, 0.1–0.2 mmwide. Stigmas 0.2–0.4 mmwide; larger than the styles.