Carex heleonastes

Linnaeus f.

Suppl. Pl., 414. 1782.

Common names: Carex des tourbières
Illustrated
Synonyms: Carex carltonia Dewey Carex heleonastes subsp. neurochlaena (T. Holm) Böcher Carex neurochlaena
Treatment appears in FNA Volume 23. Treatment on page 316. Mentioned on page 312, 314.

Plants loosely cespitose, in small clumps; rhizomes short. Culms erect, slender, 15–35 cm, rough distally. Leaves: sheaths pale-brown abaxially, inner band hyaline, often red tinged, concave at summit; ligules wider than long; blades pale green or slightly gray-green, flat or slightly involute, 5–15 cm × 1–2 mm, shorter than culms. Inflorescences 0.8–2 cm × 5–10 mm; proximal bracts scalelike, occasionally bristlelike, shorter than spikes. Spikes 3–4 (–6), lateral spikes gynecandrous, closely approximate or proximal spikes slightly separate, individually distinct, containing 5–10 perigynia, ovoid-globose, 4–7 × 5–10 mm; terminal spike not clavate. Pistillate scales redbrown with lighter center and broad white-hyaline margins, oblongovate, subequal to perigynia, apex obtuse. Perigynia appressed-ascending, green-white proximally and pale-brown distally, often mid brown in mature perigynia, finely several-veined, elliptic-obovate, 2.5–3.5 × 1.2–1.5 mm, widest near middle, subcoriaceous; beak short, entire or with few marginal teeth. Achenes redbrown, broadly obovate, 1.5 (–2) × 1–1.2 mm, dull to slightly glossy. 2n = 56.


Phenology: Fruiting Jun–Aug.
Habitat: Mires, damp meadows, lowlands
Elevation: 0–1500 m

Distribution

V23 554-distribution-map.jpg

Alta., B.C., Man., Nfld. and Labr., N.W.T., Ont., Que., Sask., Yukon, Alaska, Mich., Eurasia

Discussion

The rather doubtful species Carex neurochlaena T. Holm, described from Rink Rapids in Yukon, was recognized as C. heleonastes subsp. neurochlaena. It is characterized by slightly smaller perigynia with a short, smooth beak and distinct veins; scales with distinct, in some cases, rather broad hyaline margins; and spikelets brownish. Very little material of C. heleonastes, in the broad sense, is available from northern Yukon and Alaska, and the distinction and distribution between C. heleonastes and C. neurochlaena remains obscure. Most specimens collected from Alaska and identified as C. neurochlaena belong to C. marina.

Selected References

None.

Lower Taxa

None.

No values specified.

... more about "Carex heleonastes"
0.15 cm1.5 mm <br />0.0015 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
1.5 cm15 mm <br />0.015 m <br /> (?) +
dull +  and slightly glossy +
smaller +
1mm;1.2mm +
beaked +  and beakless +
papillose +  and smooth +
Heikki Toivonen +
Linnaeus f. +
shortened +
truncate +  and rounded +
with few marginal teeth +  and entire +
inconspicuous +
0.01 cm0.1 mm <br />1.0e-4 m <br /> (0.03 cm0.3 mm <br />3.0e-4 m <br />) +
gray-green +  and pale green +
5 cm50 mm <br />0.05 m <br /> (15 cm150 mm <br />0.15 m <br />) +
involute +  and flat +
1mm;2mm +
glumaceous +  and foliaceous +
2-ranked +  and arranged +
ascending +  and appressed +
scale-like +  and leaflike +
parallel +  and divergent +
terete +, rolled +  and plicate +
Carex des tourbières +
round +  and trigonous +
slender +
15 cm150 mm <br />0.15 m <br /> (35 cm350 mm <br />0.35 m <br />) +
Alta. +, B.C. +, Man. +, Nfld. and Labr. +, N.W.T. +, Ont. +, Que. +, Sask. +, Yukon +, Alaska +, Mich. +  and Eurasia +
0–1500 m +
open +, pistillate +  and staminate +
hypogynous +  and subtending +
biconvex +  and trigonous +
Mires, damp meadows, lowlands +
red tinged +  and hyaline +
sessile +  and pistillate +
multi-ranked +, 2-ranked +, 3-ranked +  and alternate +
basal +  and cauline +
wider than long +
white-hyaline +
angled;rounded +
with (1-)3-6(-30) bristles and/or scales +
brown +  and green-white proximally and pale-brown +
0.25 cm2.5 mm <br />0.0025 m <br /> (0.35 cm3.5 mm <br />0.0035 m <br />) +
appressed-ascending +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
subcoriaceous +
Fruiting Jun–Aug. +
2-3(-4)-carpellate +
3 (?) +  and 1 (?) +
0.4 cm4 mm <br />0.004 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
0.5 cm5 mm <br />0.005 m <br /> (1 cm10 mm <br />0.01 m <br />) +
Suppl. Pl., +
adventitious +
basal +  and proximal +
2-keeled +
subequal +
cylindric +
Illustrated +
1 (?) +  and 3 (?) +
septate +, hollow +  and solid +
compressed +, terete +  and trigonous +
papillate +
deciduous +
2-3(-4)-fid +
Carex carltonia +, Carex heleonastes subsp. neurochlaena +  and Carex neurochlaena +
Carex heleonastes +
Carex sect. Glareosae +
species +
plant +  and cespitose +