Flora of the Canadian Arctic Archipelago
English: Allen's buttercup,
French: Renoncule d'Allen.
Ranunculaceae, Buttercup family.
Published in Rhodora 7: 220. 1905.
Vegetative morphology. Plants 9–20 cm high; perennial herbs; caespitose. Only fibrous roots present. Roots slender, 0.2–0.8 mm thick. Ground level or underground stems absent. Caudex present (as a short zone at ground level). Aerial stems erect (or ascending). Aerial stem trichomes appressed, or spreading. Leaves heterophyllous (basal leaves reniform, cauline leaves deeply divided into linear divisions); mainly basal; alternate; marcescent (basal leaves), or dying annually and non-persistent. Petioles 50–80 mm long. Leaf blade bases cordate, or truncate. Leaves not grass-like. Blades 14–21 mm long, 17–28 mm wide, circular or reniform (undivided or sometimes 3-parted), flat, veins palmate. Blade adaxial surface glabrous. Blade margins flat, blades not lobed. Blade margins crenate (with more than 5 rounded lobes (crenae), basal leaves), with non-glandular hairs, with teeth toward the apex. Hydathodes present but inconspicuous. Blade apices rounded.
Reproductive morphology. Flowering stems solitary; with leaves. Flowers solitary, or in inflorescences (with 2–4 flowers). Inflorescences cymose (if applicable). Flowers medium-sized. Sepals conventional; 5; free; 2–3 mm long; 4–6 mm wide; yellow and brown; herbaceous. Calyx hairy (abaxially, pilose). Calyx hairs white or translucent (pale yellow). Petals conventional; free; 5; yellow; obovate; unlobed; 4–5 mm long; 2–4 mm wide. Stamens 20–30; stamen filaments glabrous. Nectaries present (nectary scale glabrous, forming an ovate pocket 0.2–0.3 mm long). Receptacle 3–5 mm high (in fruit, hispid); surface hairy (hispid). Ovary carpels 60–80; apocarpous. Stigmas per ovary 1. Placentation parietal. Ovules per ovary 1. Fruit stalk 4–7 mm long; dry; an aggregate of achenes; obovate (to cylindric); yellowish; 4–7 mm long; 4–6 mm wide (each achene 1.3–1.7 × 0.8–1.2(-1.4) mm, beak lance-subulate, curved 0.4–0.6 mm); indehiscent. Styles remaining straight. Seeds 1.
Chromosome information. 2n = 32.
2n (4x)= 32. Göpfert (1974).
Ploidy levels recorded 4x.
Ecology and habitat. Substrates: wet meadows, marshes, along streams; aquatic, imperfectly drained moist areas; gravel, sand; with low organic content. Wet gravel and flood plains of alpine brooks (Porsild 1957).
North American distribution. Nunavut Islands, northern Quebec, Labrador. Range in the Canadian Arctic Archipelago limited. Rare. Low Arctic. Arctic islands: Baffin.
Northern hemisphere distribution. North American (American Atlantic). Labrador Hudson Bay.
Illustrations. • Close-up of plant. Relatively small buttercup with crenate basal leaves and divided stem leaves lacks dark hairs on the sepals. Gaspe, Quebec, Macoun Aug. 27, 1882. CAN 56353. • Close-up of plant. This small buttercup lacks dark hairs on the sepals and has crenate basal leaves and divided stem leaves. Newfoundland - Labrador, Esker area. Makinen 67–905. CAN 344910. • Close-up of flowers. Close-up of flowers from previous photo. Lack of dark hairs on sepals, but sometimes light coloured hairs present. Newfoundland - Labrador, Esker area. Makinen 67–905. CAN 344910. • Arctic Island Distribution.
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..