Carex athrostachya

Olney

Proc. Amer. Acad. Arts 7: 393. 1868.

Illustrated
Treatment appears in FNA Volume 23. Treatment on page 347. Mentioned on page 332, 334, 340.

Plants densely cespitose. Culms (5–) 20–80 cm. Leaves: sheath summits usually U-shaped, sometimes prolonged to 2.5 (–4) mm beyond collar; distal ligules 1–3 (–5) mm; blades 3–4 (–5) per fertile culm, 10–20 cm × (1.5–) 2–3 (–5) mm. Inflorescences erect, dense, headlike, green to brown, (0.8–) 1.5–2.2 cm × 7–20 mm; proximal internode 1.5–5 mm; 2d internode 1–3.5 mm; proximal 2–3 bracts leaflike, ascending to spreading, much longer than inflorescences, usually less than 1.8 mm wide, bases ± surrounding culms. Spikes (5–) 7–10 (–14), individually distinct or indistinct, broadly ovoid to ovoid, (4.5–) 7–10 × 4.5–7 (–9) mm, base and apex truncate to acute. Pistillate scales gold to brown, with whitish, green, or tan midstripe, lanceolate to ovate, 2.4–4.3 mm, shorter, narrower than perigynia, margin sometimes white, 0.25 mm wide, apex acuminate to awned. Perigynia ascending to ascending-spreading, cream colored to light-brown, conspicuously 0–9-veined abaxially, conspicuously 0–8-veined adaxially, ovate to lanceolate, planoconvex or flat, (2.8–) 3.5–4 (–4.8) × (0.8–) 1–1.5 (–1.8) mm, 0.35–0.45 mm thick, margin flat, including wing (0.1–) 0.2 (–0.5) mm wide, wing ciliate-serrulate on distal body; beak gold to redbrown at tip, cylindric, unwinged, abaxial suture usually with conspicuous white margin, distance from beak tip to achene 1.9–2.5 mm, entire for at least 0.4–0.9 mm. Achenes sessile or shortly stipitate, ovate to obovate, (1–) 1.2–1.6 × 0.7–1 mm, 0.3–0.4 mm thick. 2n = 68.


Phenology: Fruiting late spring–summer.
Habitat: Seasonally moist meadows, marshes, pond and lake margins
Elevation: 100–4000 m

Distribution

V23 597-distribution-map.jpg

Alta., B.C., Man., Sask., Yukon, Alaska, Ariz., Calif., Colo., Idaho, Mont., Nev., N.Dak., Oreg., S.Dak., Tex., Utah, Wash., Wyo., Mexico (n Baja California)

Discussion

Carex athrostachya intergrades with C. unilateralis.

Selected References

None.

Lower Taxa

None.

"+timesaslongasinflorescences" is not declared as a valid unit of measurement for this property."not undefined" is not a number.

... more about "Carex athrostachya"
stipitate +  and sessile +
ovate;obovate +
smaller +
0.3mm +  and 0.4mm +
bidentatate +
papillose +
Joy Mastrogiuseppe +, Paul E. Rothrock +, A. C. Dibble +  and A. A. Reznicek +
shortened +
persistent +
truncate +  and acute +
not enlarged +
cylindric +
10 cm100 mm <br />0.1 m <br /> (20 cm200 mm <br />0.2 m <br />) +
3 (?) +  and 4 (?) +
v--shaped +
0mm;20mm +
glumaceous +  and foliaceous +
2-ranked +  and arranged +
ascending +  and spreading +
scale-like +  and leaflike +
0 cm0 mm <br />0 m <br /> (0.18 cm1.8 mm <br />0.0018 m <br />) +
parallel +  and divergent +
terete +, rolled +  and plicate +
0.3 cm3 mm <br />0.003 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
round +  and trigonous +
20 cm200 mm <br />0.2 m <br /> (80 cm800 mm <br />0.8 m <br />) +
2mm;3mm +
0.3 cm3 mm <br />0.003 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
0.1 cm1 mm <br />0.001 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
Alta. +, B.C. +, Man. +, Sask. +, Yukon +, Alaska +, Ariz. +, Calif. +, Colo. +, Idaho +, Mont. +, Nev. +, N.Dak. +, Oreg. +, S.Dak. +, Tex. +, Utah +, Wash. +, Wyo. +  and Mexico (n Baja California) +
100–4000 m +
open +, pistillate +  and staminate +
hypogynous +  and subtending +
biconvex +  and trigonous +
Seasonally moist meadows, marshes, pond and lake margins +
0.8 cm8 mm <br />0.008 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
green +  and brown +
0.1 cm1 mm <br />0.001 m <br /> (0.35 cm3.5 mm <br />0.0035 m <br />) +
not prophyllate +, sessile +  and pistillate +
multi-ranked +, 2-ranked +, 3-ranked +  and alternate +
basal +  and cauline +
conspicuous +
0.2 +, 0.2mm +  and 0.5mm +
tan +, green +  and whitish +
with (1-)3-6(-30) bristles and/or scales +
0-8-veined +  and 0-9-veined +
cream colored +  and light-brown +
ascending +  and ascending-spreading +
0.35mm +  and 0.45mm +
Fruiting late spring–summer. +
2-3(-4)-carpellate +
3 (?) +  and 1 (?) +
sheathless +  and bristlelike +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
Proc. Amer. Acad. Arts +
adventitious +
gold +  and brown +
basal +  and proximal +
lanceolate;ovate +
0.24 cm2.4 mm <br />0.0024 m <br /> (0.43 cm4.3 mm <br />0.0043 m <br />) +
narrower +
herbaceous +  and membranous +
not differentiated +
cylindric +
0.25 cm2.5 mm <br />0.0025 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
0 cm0 mm <br />0 m <br /> (0.25 cm2.5 mm <br />0.0025 m <br />) +
Illustrated +
0.45 cm4.5 mm <br />0.0045 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
0.7 cm7 mm <br />0.007 m <br /> (0.9 cm9 mm <br />0.009 m <br />) +
distinct +
0.7 cm7 mm <br />0.007 m <br /> (1 cm10 mm <br />0.01 m <br />) +
broadly ovoid;ovoid +
0.45 cm4.5 mm <br />0.0045 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
1 (?) +  and 3 (?) +
septate +, hollow +  and solid +
compressed +, terete +  and trigonous +
papillate +
deciduous +  and persistent +
2-3(-4)-fid +
Carex athrostachya +
Carex sect. Ovales +
species +
plant +  and cespitose +
ciliate-serrulate +