Linnaeus, Sp. Pl. 2: 1022. 1753.
Fernald & Wiegand subsp.
(Hagerup) D. Löve;
(Hagerup) T. J. Sørensen
green, brown, or reddish, distally glabrous, eglandular or glandular, sparsely white-tomentose.
divergent, becoming reflexed; blade 2.5-7 mm.
unisexual or bisexual (plants synoecious, sometimes polygamous, or dioecious); sepals greenish pink becoming reddish purple.
black, opaque, 5-10 mm diam.
light brown, 1.5-3 mm.
= 26, 39, 52.
Flowering spring. Exposed, coastal bluffs and sphagnum bogs, windswept southern arctic and alpine tundra and open subalpine and boreal forests and mountain summits; 0-1900 m; Greenland; St. Pierre and Miquelon; Alta., B.C., Man., N.B., Nfld. and Labr., N.W.T., N.S., Nunavut, Ont., P.E.I., Que., Sask., Yukon; Alaska, Calif., Maine, Mich., Minn., N.H., N.Y., Oreg., Vt., Wash.; Europe; Asia.
All black-fruited plants of the genus in North America are here considered to be
in the broad sense. There is great variation within the species, and various names have been proposed. Boreal and arctic diploids (2
= 26, E. Hultén 1968) with unisexual flowers, dioecious plants, have been treated as
, and tetraploids (2
= 52) with bisexual flowers, synoecious plants, as
is typified on European, dioecious, diploid plants, and in this strict sense, there has been a question whether the name should be applied to North American plants (Á. Löve and D. Löve 1959) in areas with synoecious tetraploids, where diploids were thought to be absent.
Dioecious, diploid, black-fruited crowberries are now well known from Maine, New Brunswick, Newfoundland, and Nova Scotia (J. Maunder, pers. comm.; P. Morisset, pers. comm.). There appears to be some ecological separation between the dioecious
and the synoecious
; the dioecious plants in Newfoundland are reported to be replaced by the synoecious ones at higher elevations or in very exposed localities (J. Maunder, pers. comm.).
Dioecious plants have been long known in the Pacific Northwest (J. A. Calder and R. L. Taylor 1968) and Alaska (E. Hultén 1968), and diploids have now been confirmed for the Cascade Range, Washington; Prince Rupert, British Columbia; and the Kenai Peninsula, Alaska (V. Mirré 2004). Some of these western diploids have chloroplast DNA more closely related to South American accessions (diploid
) than to any Northern Hemisphere
investigated with chloroplast
G sequences (M. Popp et al., unpubl.). The nuclear sequence data show a more complex pattern wherein the alleles found in the South American accessions represent a subset of the alleles found in the Northern Hemisphere accessions (nuclear low copy RPB2 and RPC2 sequences).
, a name in prominent usage, is typified on a Greenlandic, synoecious tetraploid, and this name and combinations of it have been applied to virtually all black-fruited synoecious plants in North America and wherever else black-fruited, synoecious crowberries are found (cf. Á. Löve and D. Löve 1959). In Europe, in addition to the diploids, there are synoecious tetraploids of
V. Mirré (2004) concluded that tetraploid synoecious plants have arisen multiple times from different combinations of diploids resulting in a large pool of unstructured genetic variation. We conclude that synoecious tetraploids do not necessarily represent a distinct lineage and must, for the present, be subsumed by
as understood here.
The population of
reported from Montauk Point, Long Island, New York, has been extirpated (S. E. Clemants, pers. comm.).