Carex tetrastachya

Scheele

Linnaea 22: 347. 1849.

IllustratedEndemic
Basionym: Carex wrightii Olney 1871
Synonyms: Carex brittoniana L. H. Bailey Carex straminea var. maxima L. H. Bailey
Treatment appears in FNA Volume 23. Treatment on page 377. Mentioned on page 335, 338, 375.

Plants densely to loosely cespitose; rhizomes black, short to ± elongate in old clumps. Culms 30–100 cm; vegetative culms few, inconspicuous, usually fewer than 12 leaves, not strikingly 3-ranked. Leaves: sheath summits with adaxial hyaline band, truncate to rounded, sometimes prolonged beyond collar; distal ligules to 5 mm; blades 3–5 per fertile culm, 13–40 cm × 2.5–5 mm. Inflorescences densely to usually open, at least proximally, silvery white, 2.5–6 cm × 10–25 mm; proximal internode (4–) 8–11 mm; 2d internode 4–8 mm; proximal bracts bristlelike to 5 cm. Spikes 2–4 (–5), distant, distinct, ovoid to globose-ovoid, 11–18 × 8–13 mm, base attenuate on terminal spike, rounded on lateral spikes, apex rounded. Pistillate scales white-hyaline with light-brown 1–3-veined midstripe, lanceolate to ovate, 4–6 mm, as long as and narrower than perignyia. apex acuminate with subulate tip or awnlike, awn of at least proximate staminate scales and sometimes proximal pistillate scales 0.1–0.9 (–2.4) mm, scabrous. Perigynia 15–80 in larger spikes, ascending, white with light green margins, veinless over achene on each face, orbiculate or little wider than long, flat, 5.5–8 (–8.7) × 3.5–6.3 mm, 0.4–0.5 mm thick, margin flat, including wing 1–2 mm wide, smooth; beak pale-brown to reddish at tip, flat, (1.4–) 1.6–2.5 (–3.4) mm, ciliate-serrulate, abaxial suture inconspicuous or brown, distance from beak tip to achene 2.5–4 mm. Achenes oblongelliptic, 2.5–3 × 1.5–2 mm, 0.4–0.5 mm thick. n = 30+III. 2n = 64, 66.


Phenology: Fruiting spring.
Habitat: Mesic to moist prairies, roadside ditches, shores
Elevation: 0–300 m

Discussion

Selected References

None.

Lower Taxa

None.

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

... more about "Carex tetrastachya"
oblongelliptic +
smaller +
0.4mm +  and 0.5mm +
bidentatate +
papillose +
Joy Mastrogiuseppe +, Paul E. Rothrock +, A. C. Dibble +  and A. A. Reznicek +
Scheele +
awnlike +
shortened +
persistent +
rounded +  and attenuate +
not enlarged +
Carex wrightii +
ciliate-serrulate +
0.25 cm2.5 mm <br />0.0025 m <br /> (0.34 cm3.4 mm <br />0.0034 m <br />) +
0.16 cm1.6 mm <br />0.0016 m <br /> (0.25 cm2.5 mm <br />0.0025 m <br />) +
13 cm130 mm <br />0.13 m <br /> (40 cm400 mm <br />0.4 m <br />) +
3 (?) +  and 5 (?) +
v--shaped +
2.5mm;5mm +
glumaceous +  and foliaceous +
2-ranked +  and arranged +
ascending +  and appressed +
scale-like +  and leaflike +
parallel +  and divergent +
terete +, rolled +  and plicate +
inconspicuous +
fertile +  and vegetative +
round +  and trigonous +
30 cm300 mm <br />0.3 m <br /> (100 cm1,000 mm <br />1 m <br />) +
0 cm0 mm <br />0 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
La. +, Okla. +  and Tex. +
0–300 m +
open +, pistillate +  and staminate +
hypogynous +  and subtending +
biconvex +  and trigonous +
Mesic to moist prairies, roadside ditches, shores +
0.4 cm4 mm <br />0.004 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
not prophyllate +, sessile +  and pistillate +
multi-ranked +, 2-ranked +, 3-ranked +  and alternate +
basal +  and cauline +
light green +
1mm +  and 2mm +
with (1-)3-6(-30) bristles and/or scales +
0.4mm +  and 0.5mm +
Fruiting spring. +
2-3(-4)-carpellate +
3 (?) +  and 1 (?) +
0 cm0 mm <br />0 m <br /> (5 cm50 mm <br />0.05 m <br />) +
0.8 cm8 mm <br />0.008 m <br /> (1.1 cm11 mm <br />0.011 m <br />) +
adventitious +
pistillate +  and staminate +
0.09 cm0.9 mm <br />9.0e-4 m <br /> (0.24 cm2.4 mm <br />0.0024 m <br />) +
white-hyaline +
lanceolate;ovate +
0.01 cm0.1 mm <br />1.0e-4 m <br /> (0.09 cm0.9 mm <br />9.0e-4 m <br />) +
herbaceous +  and membranous +
not differentiated +
cylindric +
truncate +  and rounded +
Illustrated +  and Endemic +
distinct +
1.1 cm11 mm <br />0.011 m <br /> (1.8 cm18 mm <br />0.018 m <br />) +
ovoid;globose-ovoid +
0.8 cm8 mm <br />0.008 m <br /> (1.3 cm13 mm <br />0.013 m <br />) +
1 (?) +  and 3 (?) +
septate +, hollow +  and solid +
compressed +, terete +  and trigonous +
papillate +
deciduous +  and persistent +
2-3(-4)-fid +
Carex brittoniana +  and Carex straminea var. maxima +
Carex tetrastachya +
Carex sect. Ovales +
species +
subulate +
plant +  and cespitose +