Flora of the Canadian Arctic Archipelago

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S.G. Aiken, M.J. Dallwitz, L.L. Consaul, C.L. McJannet, R.L. Boles, G.W. Argus, J.M. Gillett, P.J. Scott, R. Elven, M.C. LeBlanc, L.J. Gillespie, A.K. Brysting, H. Solstad, and J.G. Harris

Dryas punctata Juz.

Rosaceae, Rose family.

Published in Izv. Glavn. Bot. Sada SSSR 28: 320. 1929.

Type: Siberia: Prov. Irkutsk, "prope Ircutiam", leg. Stubendorff. Holotype: LE.

Synonymy. Dryas octopetala L. subsp. punctata (Juz.) Hultén, Acta Univ. Lund., n. s., sect. 2, 42, 1: 1047. 1946.

Vegetative morphology. Plants shrubs. Leaves alternate; persistent. Stipules present. Leaf blades simple. Blades linear or oblong or lanceolate.

Reproductive morphology. Flowers solitary. Sepals conventional; free. Petals conventional; free; 7–11; unlobed. Stamens 40–70. Ovules per ovary 1.

General notes. Porsild (1957) recognised a second Dryas taxon, D. punctata, as occurring in the Arctic Archipelago. Porsild (1947) keyed D. punctata as having ‘upper surfaces of the leaves with punctiform, wart-like excrescences especially on the lobes and often on petioles and stipules as well, or merely glandular-viscid from colourless, clear balsam-like secretions along the leaf folds; gland tipped hairs on the veins of the underside of the leaves always bearing tufts of white or brown hairs on their sides.’

Porsild (1957) described D. punctata as similar to D. integrifolia but in the Canadian Arctic Archipelago differing from that species by its ‘crenate-serrate leaves that are often tightly rolled, hirtellous and rugose, not shiny, on the upper surface. The nerves of the underside are beset with sessile, or short-stalked, yellowish brown glands and tufts of branched, brownish hairs.’ Conspicuously, the description says nothing about punctiform glands. Porsild (1947) stated that "in some old herbarium specimens the punctiform glands of the upper leaf surfaces are not easily seen and such material may be difficult to separate from D. octopetala."

Porsild (1957) mapped the distribution of three records for this taxon based on two specimens that he had annotated at Kew. These were as follows: one from Victoria Island, Minto Inlet [Andersson, annotated as D. punctata Juz or D. octopetala v. minor by A.E. Porsild specimen H2000/02133, Hookerianum 1867, sample 8 on the sheet]; a second one from Melville Island [Capt. Mc Clintock 1853, annotated as D. octopetala v. minor A.E. Porsild]; and a third dot on the west coast of Banks Island, near Sachs Harbour, is probably a specimen collected by T.H. Manning and I.M. Sparrow [No. 243, June 25, 1953. CAN s.n]. There is one other specimen at CAN annotated by Porsild in 1969 as D. punctata. It is from Eglinton Island and was collected by M. Kuc [6–10 July 1968, CAN 385436]. On this specimen 20 leaves were checked: 16 were without brown glandular hairs on the midrib, and 4 had brown glandular hairs. No glands were seen on the upper surface of any of the leaves, and no conspicuous reason for distinguishing these four specimens from other Dryas collections from the Canadian Arctic Archipelago was found (Aiken observations, 2000).


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.

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