Dryas punctata Juz.
Rosaceae, rose family.
Bull. Jard. Bot. Princip. U.R.S.S. 28: 320. 1929. idem Fl. U.R.S.S.
10, tab.20, fig. 6. 1941.
Dryas octopetala subsp. punctata
Hultén, Flora Alaska and Yukon, 1046. 1946 pro maxime pt.
Type: Siberia, Irkutsk Prov. LE.
Dryas octopetala subsp. hookeriana Hultén, Flora Alaska
and Yukon, 1046. 1946 pro min. pt.
Dryas henricae Juz., Flora
U.R.S.S. 10: 616. 1941.
Notes. Porsild (1957) recognized a second Dryas taxon, D.
punctata as occurring in the Arctic Archipelago and provided the synonymy
indicated above. In Porsild (1947) he 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 colorless, 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
eastern 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. In Porsild (1947) is the statement 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 3 records for this
taxon based on two specimens that he had annotated in Kew. These were, one from
Victoria Island, Minto Inlet, Anderesson, 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. 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
between 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 eastern Canadian Arctic Archipelago was found.
Siegismund and Phillip (1999) studied the genus Dryas on Svalbard
noting that the population thereastern Canada be subdivided into individuals
with (Dryas punctata) or without (Dryas octopetala) large sessile
glands on the upper surface of the leaves. To analyse whether the gland
characters are correlated to other differences between these two groups of
individuals, a number of morphological and isozyme characters were investigated
in four populations. Siegismund and Phillip (1999) found that differences among
populations were larger than between the two groups of plants with or without
sessile glands and concluded that there is no reason for maintaining more than
one species of Dryas on Svalbard: D. octopetala.
Cite this publication as: ‘S.G. Aiken, M.J. Dallwitz, L.L. Consaul, C.L. McJannet, L.J. Gillespie, R.L. Boles, G.W. Argus, J.M. Gillett, P.J. Scott, R. Elven, M.C. LeBlanc, A.K. Brysting and H. Solstad. 1999 onwards. Flora of the Canadian Arctic Archipelago: Descriptions, Illustrations, Identification, and Information Retrieval. Version: 29th April 2003. http://www.mun.ca/biology/delta/arcticf/’. Dallwitz (1980) and Dallwitz, Paine and Zurcher (1993, 1995, 2000) should also be cited (see References).