Carex bigelowii subsp. lugens

(Holm) T. V. Egorova

Novosti Sist. Vyssh. Rast. 10: 104. 1973.

Illustrated
Basionym: Carex lugens T. Holm Amer. J. Sci. 160: 269, figs. A–D. 1900
Synonyms: Carex consimilis T. Holm Carex cyclocarpa T. Holm Carex yukonensis Britton
Treatment appears in FNA Volume 23. Treatment on page 401. Mentioned on page 397, 400.

Plants usually cespitose. Proximal pistillate spike densely flowered, base cuneate, less often attenuate. Perigynia green, uniformly purple-black on apical 1/2, 1.5–2.9 × 0.9–2 mm; stipe 0–0.15 mm, apex rounded or acute, strongly to minutely papillose. 2n = 80 (Asia).


Phenology: Fruiting Aug–Sep.
Habitat: Dry to moist tundra
Elevation: 0–1500 m

Distribution

V23 720-distribution-map.jpg

B.C., N.W.T., Nunavut, Yukon, Alaska, Asia (Siberia), Asia (Russian Far East)

Discussion

The chromosome number reported for Carex bigelowii subsp. lugens from eastern Asia indicates that there may be a significant genetic difference between populations of the two regions.

Most floras (I. L. Wiggins and J. H. Thomas 1962; E. Hultén 1968; A. E. Porsild and W. J. Cody 1980) recognize two species, C. lugens and C. consimilis, in the western Arctic, with greater affinities to the eastern Asian members of the complex than to the eastern C. bigelowii. These treatments usually separate C. lugens by the cespitose habit, leaves less than 2 mm wide, and setaceous proximal bract. Careful study of the complex indicates that although there are cespitose and rhizomatous morphs, leaf width, bract width, perigynium size and shape all vary considerably within and between populations and variation is not correlated with habit. It is not known whether variation in habit is due to genetic differences or merely to plant responses to differences in substrate and soil moisture. Long-rhizomatous plants tend to occur in dry tundra, and short-rhizomatous plants tend to occur in wet, peaty muskeg. For that reason, the group is recognized as a single taxon that clearly needs further study.

Carex bigelowii subsp. lugens may intergrade or hybridize with C. scopulorum at the southern edge of the range in the Yukon, as indicated by the wider leaves and large range of variation in the area. Carex sphacelata T. Holm and C. chionophila T. Holm, also described from the Yukon, appear to be hybrids between C. bigelowii subsp. lugens and C. aquatilis.

Selected References

None.

Lower Taxa

None.
biconvex +
not constricted +
papillose +
Lisa A. Standley +, Jacques Cayouette +  and Leo Bruederle +
(Holm) T. V. Egorova +
shortened +
not +  and fibrous +
attenuate +  and cuneate +
Carex lugens +
0.02 cm0.2 mm <br />2.0e-4 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
bidentate +  and emarginate +
0 cm0 mm <br />0 m <br /> (0.02 cm0.2 mm <br />2.0e-4 m <br />) +
m--shaped +  and v--shaped +
1.5mm;4mm +
glumaceous +  and foliaceous +
2-ranked +  and arranged +
ascending +  and appressed +
scale-like +  and leaflike +
parallel +  and divergent +
terete +, rolled +  and plicate +
redbrown +  and brown +
10 cm100 mm <br />0.1 m <br /> (50 cm500 mm <br />0.5 m <br />) +
prophyllate +, subsessile +, pedunculate +  and staminate +
B.C. +, N.W.T. +, Nunavut +, Yukon +, Alaska +, Asia (Siberia) +  and Asia (Russian Far East) +
0–1500 m +
open +, pistillate +  and staminate +
hypogynous +  and subtending +
biconvex +  and trigonous +
Dry to moist tundra +
multi-ranked +, 2-ranked +, 3-ranked +  and alternate +
basal +  and cauline +
with (1-)3-6(-30) bristles and/or scales +
purple-black +  and green +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.29 cm2.9 mm <br />0.0029 m <br />) +
0.09 cm0.9 mm <br />9.0e-4 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
Fruiting Aug–Sep. +
2-3(-4)-carpellate +
3 (?) +  and 1 (?) +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
flowered +  and pistillate +
Novosti Sist. Vyssh. Rast. +
adventitious +
basal +  and proximal +
2-keeled +
ladder-fibrillose +  and veined +
cylindric +
Illustrated +
staminate +  and pistillate +
0.7 cm7 mm <br />0.007 m <br /> (3 cm30 mm <br />0.03 m <br />) +
0.3 cm3 mm <br />0.003 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
1 (?) +  and 3 (?) +
septate +, hollow +  and solid +
compressed +, terete +  and trigonous +
papillate +
0 cm0 mm <br />0 m <br /> (?) +  and 0.015 cm0.15 mm <br />1.5e-4 m <br /> (?) +
deciduous +
2-3(-4)-fid +
Carex consimilis +, Carex cyclocarpa +  and Carex yukonensis +
Carex bigelowii subsp. lugens +
Carex bigelowii +
subspecies +
, +  and staminate +
plant +  and cespitose +