Flora of the Canadian Arctic Archipelago
Brassicaceae (Cruciferae), Draba family.
Published in Chlor. Melvill. 10. 1823.
Synonymy. Neuroloma Andrz. ex DC., Prodr. 1: 156. 1824.
Achoriphragma Soják, Sborn. Nár. Mus. 5. Praze 1982, 1–2: 105. 1982.
Vegetative morphology. Plants 1–14 cm high; perennial herbs; caespitose. Taproot present. Caudex present. Aerial stems erect. Leaves mainly basal; alternate; dying annually and non-persistent. Petioles absent. Leaf blades simple. Leaf blade bases attenuate. Blades (7–)12–80(–100) mm long, 3–24 mm wide, lanceolate or ovate or oblanceolate or obovate, appearing single-veined. Blade adaxial surface glabrous or hairy, hairs pilose (if applicable), hairs simple, hairs sparse, hairs white, or translucent. Blade abaxial surface glabrous or hairy, hairs pilose (if applicable), hairs sparse, hairs white. Blade margins entire or serrate or dentate, glabrous, with teeth all around the blade (if applicable); apices acute, or obtuse.
Reproductive morphology. Flowering stems about as high as the leaves, or conspicuously taller than the leaves. Flowering stem hairs shorter than the diameter of the flowering stem; glandular hairs present (if applicable). Inflorescences racemose. Flowers per inflorescence 6–12; medium-sized, or large. Sepals conventional; 4; free; 2.5–7 mm wide; purple, or green and purple; herbaceous, or scarious (white margins). Calyx glabrous. Petals conventional; free; 4; white, or purple; obovate; unlobed, or slightly lobed or undulating; 7–15 mm long. Stamens 6; stamen filaments markedly unequal in length; stamen filaments glabrous. Anthers yellow; 1–2.5 mm long. Ovary superior; carpels 2; syncarpous. Ovaries glabrous. Styles 1; 0.1–1.1 mm long. Stigmas per ovary 1. Placentation parietal. Ovules per ovary 6–12. Fruit stalk 9–25 mm long; dry; a silique; ovoid; brown, or purple, or yellowish; 6–25 mm long; 1.5–6 mm wide; glabrous, or hairy; surface appearing veinless (or obscurely veined); distinctly flattened (tapering at both ends); dehiscent; shedding the outer walls to expose a thin inner wall, with the seeds attached at the margins on either side. Styles persisting in fruit 0.2–2 mm long. Seeds (4–)6–12; 1–3 mm long; brown; surfaces verrucose, winged.
Chromosome information. 2n = 14 and 28.
2n (2x) = 14. Mosquin and Hayley (1966, northern Canada); Hedberg (1967, northern Canada, as P. arctica?);
2n (3x) = about 21. Mosquin and Hayley (1966, northern Canada); Mulligan (unpublished?, northern Canada); Mulligan (2003).
Ploidy levels recorded 2x and 4x.
Ecology and habitat. Substrates: imperfectly drained moist areas, seepage slopes, dry; gravel, sand, silt, clay, till, moss; with low organic content, with high organic content; acidic, or calcareous. Wet calcareous clay and barrens, or calcareous alpine meadows.
North American distribution. Alaska, Yukon, Northwest Territories Islands, continental Northwest Territories, Nunavut Islands, continental Nunavut, northern Quebec. Range in the Canadian Arctic Archipelago widespread, or limited. Common, uncommon. Arctic, High Arctic, alpine. Arctic islands: Parry islands, Cornwallis, Banks, Victoria, Prince of Wales, Somerset, King William.
Northern hemisphere distribution. Amphi-Beringian, or North American. KaninPechora, Polar Ural Novaya Zemlya, YamalGydan, Taimyr Severnaya Zemlya, AnabarOlenyok, Kharaulakh, YanaKolyma, West Chukotka, Wrangel Island, South Chukotka, East Chukotka, West Alaska, North Alaska Yukon, Central Canada, Labrador Hudson Bay, Ellesmere Land Peary Land.
General notes. In the flowering stages of relatively small plants of Erysiumum and relatively large plants of Parrya the genera may be difficult to distinguish. The fruiting stage or the dried outlines of previous season's siliques help distinguish the long, straight, and narrow siliques of Erysimum from the wider, shorter, torulose siliques of Parrya.
This publication is available on the internet (posted May 2011) and on CD-ROM (published in 2007). These versions are identical in content, except that the errata page for CD-ROM is accessible on the main index page of the web version.
Recommended citation for the web-based version of this publication: Aiken, S.G., Dallwitz, M.J., Consaul, L.L., McJannet, C.L., Boles, R.L., Argus, G.W., Gillett, J.M., Scott, P.J., Elven, R., LeBlanc, M.C., Gillespie, L.J., Brysting, A.K., Solstad, H., and Harris, J.G. 2007. Flora of the Canadian Arctic Archipelago: Descriptions, Illustrations, Identification, and Information Retrieval. NRC Research Press, National Research Council of Canada, Ottawa. http://nature.ca/aaflora/data, accessed on DATE.
Recommended citation for the CD-ROM version of this publication: Aiken, S.G., Dallwitz, M.J., Consaul, L.L., McJannet, C.L., Boles, R.L., Argus, G.W., Gillett, J.M., Scott, P.J., Elven, R., LeBlanc, M.C., Gillespie, L.J., Brysting, A.K., Solstad, H., and Harris, J.G. 2007. Flora of the Canadian Arctic Archipelago: Descriptions, Illustrations, Identification, and Information Retrieval. [CD-ROM] NRC Research Press, National Research Council of Canada, Ottawa..