Carex eleusinoides

Turczaninow ex Kunth

Enum. Pl. 2: 407. 1837.

Illustrated
Synonyms: Carex kokrinensis A. E. Porsild
Treatment appears in FNA Volume 23. Treatment on page 394. Mentioned on page 379, 381, 391, 392, 393.

Plants cespitose. Culms obtusely angled, 15–30 cm, glabrous. Leaves: basal sheaths redbrown; sheaths of proximal leaves glabrous, fronts colorless, veinless, apex U-shaped; blades amphistomic, 2.5–3 mm wide, papillose on both surfaces. Inflorescences: proximal bract longer than inflorescence, 1.5 mm wide. Spikes erect, condensed; proximal 3–4 spikes pistillate, proximal spike 2.2–3 cm × 3 mm, base cuneate; terminal spike gynecandrous. Pistillate scales redbrown or black, equaling perigynia, apex obtuse, awnless. Perigynia ascending, white with redbrown spots on apical 1/2 or apical 1/2 black, veinless or indistinctly veined, stipitate, tightly enclosing achenes, thin-walled, ellipsoid, 2–2.2 × 1.2–1.5 mm, dull, base truncate, distended, apex rounded, glabrous; stipe to 0.2 mm; beak redbrown, 0.1 mm. Achenes not constricted, dull, base adnate to perigynium. 2n = 84.


Phenology: Fruiting Aug–Sep.
Habitat: Wet gravel, streams, and outwashes
Elevation: 0–800 m

Distribution

V23 701-distribution-map.jpg

B.C., Yukon, Alaska, Eurasia (Siberia) to Asia (Siberia), Eurasia (Siberia) to Asia (Russian Far East)

Discussion

Carex eleusinoides is a member of the C. acuta complex based on amphistomic and amphi-papillose leaves, perigynia that are stipitate and basally distended by the achenes, and chromosome number. It differs from other western members of the group by distinctly red basal sheaths, and by absence of distinct veins on very small perigynia.

Selected References

None.

Lower Taxa

None.
... more about "Carex eleusinoides"
stipitate +, veined +  and veinless +
biconvex +
not constricted +
, +  and papillose +
redbrown spots +
Lisa A. Standley +, Jacques Cayouette +  and Leo Bruederle +
Turczaninow ex Kunth +
shortened +
not +  and fibrous +
distended +  and cuneate +
bidentate +  and emarginate +
0.1 cm1 mm <br />0.001 m <br /> (?) +
papillose +
m--shaped +  and v--shaped +
2.5mm;3mm +
glumaceous +  and foliaceous +
2-ranked +  and arranged +
ascending +  and appressed +
scale-like +  and leaflike +
parallel +  and divergent +
terete +, rolled +  and plicate +
redbrown +  and brown +
15 cm150 mm <br />0.15 m <br /> (30 cm300 mm <br />0.3 m <br />) +
prophyllate +, subsessile +, pedunculate +  and staminate +
B.C. +, Yukon +, Alaska +, Eurasia (Siberia) to Asia (Siberia) +  and Eurasia (Siberia) to Asia (Russian Far East) +
0–800 m +
open +, pistillate +  and staminate +
hypogynous +  and subtending +
biconvex +  and trigonous +
Wet gravel, streams, and outwashes +
multi-ranked +, 2-ranked +, 3-ranked +  and alternate +
basal +  and cauline +
with (1-)3-6(-30) bristles and/or scales +
0.2 cm2 mm <br />0.002 m <br /> (0.22 cm2.2 mm <br />0.0022 m <br />) +
0.12 cm1.2 mm <br />0.0012 m <br /> (0.15 cm1.5 mm <br />0.0015 m <br />) +
Fruiting Aug–Sep. +
2-3(-4)-carpellate +
3 (?) +  and 1 (?) +
short-sheathing +, sheathless +  and leaflike +
1.5 cm15 mm <br />0.015 m <br /> (?) +
2.2 cm22 mm <br />0.022 m <br /> (3 cm30 mm <br />0.03 m <br />) +
3 cm30 mm <br />0.03 m <br /> (?) +
adventitious +
black +  and redbrown +
basal +  and proximal +
2-keeled +
ladder-fibrillose +  and veined +
cylindric +
Illustrated +
pistillate +  and condensed +
1 (?) +  and 3 (?) +
septate +, hollow +  and solid +
compressed +, terete +  and trigonous +
papillate +
0 cm0 mm <br />0 m <br /> (?) +  and 0.02 cm0.2 mm <br />2.0e-4 m <br /> (?) +
deciduous +
2-3(-4)-fid +
Carex kokrinensis +
Carex eleusinoides +
Carex sect. Phacocystis +
species +
, +  and staminate +
plant +  and cespitose +